Move a chunk of classes over to using JID objects

22 files changed, 526 insertions, 475 deletions

diff --git a/src/main/java/eu/siacs/conversations/crypto/OtrEngine.java b/src/main/java/eu/siacs/conversations/crypto/OtrEngine.java
index e0bd0e793..82d7145e2 100644
--- a/src/main/java/eu/siacs/conversations/crypto/OtrEngine.java
+++ b/src/main/java/eu/siacs/conversations/crypto/OtrEngine.java
@@ -85,13 +85,11 @@ public class OtrEngine implements OtrEngineHost {
 			this.account.setKey("otr_p", privateKeySpec.getP().toString(16));
 			this.account.setKey("otr_q", privateKeySpec.getQ().toString(16));
 			this.account.setKey("otr_y", publicKeySpec.getY().toString(16));
-		} catch (NoSuchAlgorithmException e) {
-			e.printStackTrace();
-		} catch (InvalidKeySpecException e) {
+		} catch (final NoSuchAlgorithmException | InvalidKeySpecException e) {
 			e.printStackTrace();
 		}
 
-	}
+    }
 
 	@Override
 	public void askForSecret(SessionID arg0, InstanceTag arg1, String arg2) {
@@ -157,9 +155,9 @@ public class OtrEngine implements OtrEngineHost {
 		MessagePacket packet = new MessagePacket();
 		packet.setFrom(account.getFullJid());
 		if (session.getUserID().isEmpty()) {
-			packet.setTo(session.getAccountID());
+			packet.setAttribute("to", session.getAccountID());
 		} else {
-			packet.setTo(session.getAccountID() + "/" + session.getUserID());
+			packet.setAttribute("to", session.getAccountID() + "/" + session.getUserID());
 		}
 		packet.setBody(body);
 		packet.addChild("private", "urn:xmpp:carbons:2");
diff --git a/src/main/java/eu/siacs/conversations/crypto/PgpEngine.java b/src/main/java/eu/siacs/conversations/crypto/PgpEngine.java
index 9a2b4a11c..ae4a54a16 100644
--- a/src/main/java/eu/siacs/conversations/crypto/PgpEngine.java
+++ b/src/main/java/eu/siacs/conversations/crypto/PgpEngine.java
@@ -41,7 +41,7 @@ public class PgpEngine {
 		Intent params = new Intent();
 		params.setAction(OpenPgpApi.ACTION_DECRYPT_VERIFY);
 		params.putExtra(OpenPgpApi.EXTRA_ACCOUNT_NAME, message
-				.getConversation().getAccount().getJid());
+				.getConversation().getAccount().getJid().toString());
 		if (message.getType() == Message.TYPE_TEXT) {
 			InputStream is = new ByteArrayInputStream(message.getBody()
 					.getBytes());
@@ -77,10 +77,7 @@ public class PgpEngine {
 						return;
 					case OpenPgpApi.RESULT_CODE_ERROR:
 						callback.error(R.string.openpgp_error, message);
-						return;
-					default:
-						return;
-					}
+                    }
 				}
 			});
 		} else if (message.getType() == Message.TYPE_IMAGE) {
@@ -135,15 +132,10 @@ public class PgpEngine {
 							return;
 						case OpenPgpApi.RESULT_CODE_ERROR:
 							callback.error(R.string.openpgp_error, message);
-							return;
-						default:
-							return;
 						}
 					}
 				});
-			} catch (FileNotFoundException e) {
-				callback.error(R.string.error_decrypting_file, message);
-			} catch (IOException e) {
+			} catch (final IOException e) {
 				callback.error(R.string.error_decrypting_file, message);
 			}
 
@@ -164,7 +156,7 @@ public class PgpEngine {
 					.getMucOptions().getPgpKeyIds());
 		}
 		params.putExtra(OpenPgpApi.EXTRA_ACCOUNT_NAME, message
-				.getConversation().getAccount().getJid());
+				.getConversation().getAccount().getJid().toString());
 
 		if (message.getType() == Message.TYPE_TEXT) {
 			params.putExtra(OpenPgpApi.EXTRA_REQUEST_ASCII_ARMOR, true);
@@ -237,12 +229,8 @@ public class PgpEngine {
 						}
 					}
 				});
-			} catch (FileNotFoundException e) {
+			} catch (final IOException e) {
 				callback.error(R.string.openpgp_error, message);
-				return;
-			} catch (IOException e) {
-				callback.error(R.string.openpgp_error, message);
-				return;
 			}
 		}
 	}
@@ -254,7 +242,7 @@ public class PgpEngine {
 		if (status == null) {
 			status = "";
 		}
-		StringBuilder pgpSig = new StringBuilder();
+		final StringBuilder pgpSig = new StringBuilder();
 		pgpSig.append("-----BEGIN PGP SIGNED MESSAGE-----");
 		pgpSig.append('\n');
 		pgpSig.append('\n');
@@ -269,7 +257,7 @@ public class PgpEngine {
 		Intent params = new Intent();
 		params.setAction(OpenPgpApi.ACTION_DECRYPT_VERIFY);
 		params.putExtra(OpenPgpApi.EXTRA_REQUEST_ASCII_ARMOR, true);
-		params.putExtra(OpenPgpApi.EXTRA_ACCOUNT_NAME, account.getJid());
+		params.putExtra(OpenPgpApi.EXTRA_ACCOUNT_NAME, account.getJid().toString());
 		InputStream is = new ByteArrayInputStream(pgpSig.toString().getBytes());
 		ByteArrayOutputStream os = new ByteArrayOutputStream();
 		Intent result = api.executeApi(params, is, os);
@@ -296,7 +284,7 @@ public class PgpEngine {
 		Intent params = new Intent();
 		params.putExtra(OpenPgpApi.EXTRA_REQUEST_ASCII_ARMOR, true);
 		params.setAction(OpenPgpApi.ACTION_SIGN);
-		params.putExtra(OpenPgpApi.EXTRA_ACCOUNT_NAME, account.getJid());
+		params.putExtra(OpenPgpApi.EXTRA_ACCOUNT_NAME, account.getJid().toString());
 		InputStream is = new ByteArrayInputStream(status.getBytes());
 		final OutputStream os = new ByteArrayOutputStream();
 		api.executeApiAsync(params, is, os, new IOpenPgpCallback() {
@@ -338,8 +326,7 @@ public class PgpEngine {
 					return;
 				case OpenPgpApi.RESULT_CODE_ERROR:
 					callback.error(R.string.openpgp_error, account);
-					return;
-				}
+                }
 			}
 		});
 	}
@@ -349,7 +336,7 @@ public class PgpEngine {
 		params.setAction(OpenPgpApi.ACTION_GET_KEY);
 		params.putExtra(OpenPgpApi.EXTRA_KEY_ID, contact.getPgpKeyId());
 		params.putExtra(OpenPgpApi.EXTRA_ACCOUNT_NAME, contact.getAccount()
-				.getJid());
+				.getJid().toString());
 		api.executeApiAsync(params, null, null, new IOpenPgpCallback() {
 
 			@Override
@@ -365,8 +352,7 @@ public class PgpEngine {
 					return;
 				case OpenPgpApi.RESULT_CODE_ERROR:
 					callback.error(R.string.openpgp_error, contact);
-					return;
-				}
+                }
 			}
 		});
 	}
@@ -376,7 +362,7 @@ public class PgpEngine {
 		params.setAction(OpenPgpApi.ACTION_GET_KEY);
 		params.putExtra(OpenPgpApi.EXTRA_KEY_ID, contact.getPgpKeyId());
 		params.putExtra(OpenPgpApi.EXTRA_ACCOUNT_NAME, contact.getAccount()
-				.getJid());
+				.getJid().toString());
 		Intent result = api.executeApi(params, null, null);
 		return (PendingIntent) result
 				.getParcelableExtra(OpenPgpApi.RESULT_INTENT);
@@ -386,7 +372,7 @@ public class PgpEngine {
 		Intent params = new Intent();
 		params.setAction(OpenPgpApi.ACTION_GET_KEY);
 		params.putExtra(OpenPgpApi.EXTRA_KEY_ID, pgpKeyId);
-		params.putExtra(OpenPgpApi.EXTRA_ACCOUNT_NAME, account.getJid());
+		params.putExtra(OpenPgpApi.EXTRA_ACCOUNT_NAME, account.getJid().toString());
 		Intent result = api.executeApi(params, null, null);
 		return (PendingIntent) result
 				.getParcelableExtra(OpenPgpApi.RESULT_INTENT);
diff --git a/src/main/java/eu/siacs/conversations/entities/Account.java b/src/main/java/eu/siacs/conversations/entities/Account.java
index 80a9d62f9..e600f37b5 100644
--- a/src/main/java/eu/siacs/conversations/entities/Account.java
+++ b/src/main/java/eu/siacs/conversations/entities/Account.java
@@ -2,7 +2,6 @@ package eu.siacs.conversations.entities;
 
 import java.security.interfaces.DSAPublicKey;
 import java.util.List;
-import java.util.Locale;
 import java.util.concurrent.CopyOnWriteArrayList;
 
 import net.java.otr4j.crypto.OtrCryptoEngineImpl;
@@ -16,6 +15,9 @@ import eu.siacs.conversations.R;
 import eu.siacs.conversations.crypto.OtrEngine;
 import eu.siacs.conversations.services.XmppConnectionService;
 import eu.siacs.conversations.xmpp.XmppConnection;
+import eu.siacs.conversations.xmpp.jid.InvalidJidException;
+import eu.siacs.conversations.xmpp.jid.Jid;
+
 import android.content.ContentValues;
 import android.database.Cursor;
 import android.os.SystemClock;
@@ -50,12 +52,10 @@ public class Account extends AbstractEntity {
 	public static final int STATUS_REGISTRATION_SUCCESSFULL = 9;
 	public static final int STATUS_REGISTRATION_NOT_SUPPORTED = 10;
 
-	protected String username;
-	protected String server;
+	protected Jid jid;
 	protected String password;
 	protected int options = 0;
 	protected String rosterVersion;
-	protected String resource = "mobile";
 	protected int status = -1;
 	protected JSONObject keys = new JSONObject();
 	protected String avatar;
@@ -69,31 +69,36 @@ public class Account extends AbstractEntity {
 	private String otrFingerprint;
 	private Roster roster = null;
 
-	private List<Bookmark> bookmarks = new CopyOnWriteArrayList<Bookmark>();
-	public List<Conversation> pendingConferenceJoins = new CopyOnWriteArrayList<Conversation>();
-	public List<Conversation> pendingConferenceLeaves = new CopyOnWriteArrayList<Conversation>();
+	private List<Bookmark> bookmarks = new CopyOnWriteArrayList<>();
+	public List<Conversation> pendingConferenceJoins = new CopyOnWriteArrayList<>();
+	public List<Conversation> pendingConferenceLeaves = new CopyOnWriteArrayList<>();
 
 	public Account() {
 		this.uuid = "0";
 	}
 
-	public Account(String username, String server, String password) {
-		this(java.util.UUID.randomUUID().toString(), username, server,
+	public Account(final Jid jid, final String password) {
+		this(java.util.UUID.randomUUID().toString(), jid,
 				password, 0, null, "", null);
 	}
 
-	public Account(String uuid, String username, String server,
-			String password, int options, String rosterVersion, String keys,
-			String avatar) {
+	public Account(final String uuid, final Jid jid,
+			final String password, final int options, final String rosterVersion, final String keys,
+			final String avatar) {
 		this.uuid = uuid;
-		this.username = username;
-		this.server = server;
+        this.jid = jid;
+        if (jid.getResourcepart().isEmpty()) {
+            try {
+                this.setResource("mobile");
+            } catch (final InvalidJidException ignored) {
+            }
+        }
 		this.password = password;
 		this.options = options;
 		this.rosterVersion = rosterVersion;
 		try {
 			this.keys = new JSONObject(keys);
-		} catch (JSONException e) {
+		} catch (final JSONException ignored) {
 
 		}
 		this.avatar = avatar;
@@ -112,30 +117,30 @@ public class Account extends AbstractEntity {
 	}
 
 	public String getUsername() {
-		return username;
+		return jid.getLocalpart();
 	}
 
-	public void setUsername(String username) {
-		this.username = username;
-	}
+	public void setUsername(final String username) throws InvalidJidException {
+        jid = Jid.fromParts(username, jid.getDomainpart(), jid.getResourcepart());
+    }
 
-	public String getServer() {
-		return server;
+	public Jid getServer() {
+		return jid.toDomainJid();
 	}
 
-	public void setServer(String server) {
-		this.server = server;
+	public void setServer(final String server) throws InvalidJidException {
+        jid = Jid.fromParts(jid.getLocalpart(), server, jid.getResourcepart());
 	}
 
 	public String getPassword() {
 		return password;
 	}
 
-	public void setPassword(String password) {
+	public void setPassword(final String password) {
 		this.password = password;
 	}
 
-	public void setStatus(int status) {
+	public void setStatus(final int status) {
 		this.status = status;
 	}
 
@@ -156,25 +161,19 @@ public class Account extends AbstractEntity {
 	}
 
 	public boolean hasErrorStatus() {
-		if (getXmppConnection() == null) {
-			return false;
-		} else {
-			return getStatus() > STATUS_NO_INTERNET
-					&& (getXmppConnection().getAttempt() >= 2);
-		}
+        return getXmppConnection() != null && getStatus() > STATUS_NO_INTERNET && (getXmppConnection().getAttempt() >= 2);
 	}
 
-	public void setResource(String resource) {
-		this.resource = resource;
+	public void setResource(final String resource) throws InvalidJidException {
+        jid = Jid.fromParts(jid.getLocalpart(), jid.getDomainpart(), resource);
 	}
 
 	public String getResource() {
-		return this.resource;
+		return jid.getResourcepart();
 	}
 
-	public String getJid() {
-		return username.toLowerCase(Locale.getDefault()) + "@"
-				+ server.toLowerCase(Locale.getDefault());
+	public Jid getJid() {
+        return jid.toBareJid();
 	}
 
 	public JSONObject getKeys() {
@@ -210,8 +209,8 @@ public class Account extends AbstractEntity {
 	public ContentValues getContentValues() {
 		ContentValues values = new ContentValues();
 		values.put(UUID, uuid);
-		values.put(USERNAME, username);
-		values.put(SERVER, server);
+		values.put(USERNAME, jid.getLocalpart());
+		values.put(SERVER, jid.getDomainpart());
 		values.put(PASSWORD, password);
 		values.put(OPTIONS, options);
 		values.put(KEYS, this.keys.toString());
@@ -221,9 +220,14 @@ public class Account extends AbstractEntity {
 	}
 
 	public static Account fromCursor(Cursor cursor) {
-		return new Account(cursor.getString(cursor.getColumnIndex(UUID)),
-				cursor.getString(cursor.getColumnIndex(USERNAME)),
-				cursor.getString(cursor.getColumnIndex(SERVER)),
+        Jid jid = null;
+        try {
+            jid = Jid.fromParts(cursor.getString(cursor.getColumnIndex(USERNAME)),
+                    cursor.getString(cursor.getColumnIndex(SERVER)), "mobile");
+        } catch (final InvalidJidException ignored) {
+        }
+        return new Account(cursor.getString(cursor.getColumnIndex(UUID)),
+                jid,
 				cursor.getString(cursor.getColumnIndex(PASSWORD)),
 				cursor.getInt(cursor.getColumnIndex(OPTIONS)),
 				cursor.getString(cursor.getColumnIndex(ROSTERVERSION)),
@@ -246,8 +250,8 @@ public class Account extends AbstractEntity {
 		this.xmppConnection = connection;
 	}
 
-	public String getFullJid() {
-		return this.getJid() + "/" + this.resource;
+	public Jid getFullJid() {
+        return this.getJid();
 	}
 
 	public String getOtrFingerprint() {
@@ -265,7 +269,7 @@ public class Account extends AbstractEntity {
 				builder.insert(26, " ");
 				builder.insert(35, " ");
 				this.otrFingerprint = builder.toString();
-			} catch (OtrCryptoException e) {
+			} catch (final OtrCryptoException ignored) {
 
 			}
 		}
diff --git a/src/main/java/eu/siacs/conversations/entities/Bookmark.java b/src/main/java/eu/siacs/conversations/entities/Bookmark.java
index dd9e805c2..54dcfea11 100644
--- a/src/main/java/eu/siacs/conversations/entities/Bookmark.java
+++ b/src/main/java/eu/siacs/conversations/entities/Bookmark.java
@@ -3,15 +3,17 @@ package eu.siacs.conversations.entities;
 import java.util.Locale;
 
 import eu.siacs.conversations.xml.Element;
+import eu.siacs.conversations.xmpp.jid.InvalidJidException;
+import eu.siacs.conversations.xmpp.jid.Jid;
 
 public class Bookmark extends Element implements ListItem {
 
 	private Account account;
 	private Conversation mJoinedConversation;
 
-	public Bookmark(Account account, String jid) {
+	public Bookmark(final Account account, final Jid jid) {
 		super("conference");
-		this.setAttribute("jid", jid);
+		this.setAttribute("jid", jid.toString());
 		this.account = account;
 	}
 
@@ -55,10 +57,10 @@ public class Bookmark extends Element implements ListItem {
 	}
 
 	@Override
-	public int compareTo(ListItem another) {
-		return this.getDisplayName().compareToIgnoreCase(
-				another.getDisplayName());
-	}
+	public int compareTo(final ListItem another) {
+        return this.getDisplayName().compareToIgnoreCase(
+                another.getDisplayName());
+    }
 
 	@Override
 	public String getDisplayName() {
@@ -68,16 +70,20 @@ public class Bookmark extends Element implements ListItem {
 		} else if (getName() != null) {
 			return getName();
 		} else {
-			return this.getJid().split("@")[0];
+			return this.getJid().getLocalpart();
 		}
 	}
 
 	@Override
-	public String getJid() {
-		String jid = this.getAttribute("jid");
+	public Jid getJid() {
+		final String jid = this.getAttribute("jid");
 		if (jid != null) {
-			return jid.toLowerCase(Locale.US);
-		} else {
+            try {
+                return Jid.fromString(jid);
+            } catch (final InvalidJidException e) {
+                return null;
+            }
+        } else {
 			return null;
 		}
 	}
@@ -108,7 +114,7 @@ public class Bookmark extends Element implements ListItem {
 
 	public boolean match(String needle) {
 		return needle == null
-				|| getJid().contains(needle.toLowerCase(Locale.US))
+				|| getJid().toString().toLowerCase(Locale.US).contains(needle.toLowerCase(Locale.US))
 				|| getDisplayName().toLowerCase(Locale.US).contains(
 						needle.toLowerCase(Locale.US));
 	}
diff --git a/src/main/java/eu/siacs/conversations/entities/Contact.java b/src/main/java/eu/siacs/conversations/entities/Contact.java
index af5172d36..8fa91b028 100644
--- a/src/main/java/eu/siacs/conversations/entities/Contact.java
+++ b/src/main/java/eu/siacs/conversations/entities/Contact.java
@@ -1,16 +1,18 @@
 package eu.siacs.conversations.entities;
 
-import java.util.HashSet;
-import java.util.Locale;
-import java.util.Set;
+import android.content.ContentValues;
+import android.database.Cursor;
 
 import org.json.JSONArray;
 import org.json.JSONException;
 import org.json.JSONObject;
 
+import java.util.HashSet;
+import java.util.Set;
+
 import eu.siacs.conversations.xml.Element;
-import android.content.ContentValues;
-import android.database.Cursor;
+import eu.siacs.conversations.xmpp.jid.InvalidJidException;
+import eu.siacs.conversations.xmpp.jid.Jid;
 
 public class Contact implements ListItem {
 	public static final String TABLENAME = "contacts";
@@ -31,7 +33,7 @@ public class Contact implements ListItem {
 	protected String systemName;
 	protected String serverName;
 	protected String presenceName;
-	protected String jid;
+	protected Jid jid;
 	protected int subscription = 0;
 	protected String systemAccount;
 	protected String photoUri;
@@ -41,12 +43,10 @@ public class Contact implements ListItem {
 
 	protected Account account;
 
-	protected boolean inRoster = true;
-
 	public Lastseen lastseen = new Lastseen();
 
 	public Contact(final String account, final String systemName, final String serverName,
-		final String jid, final int subscription, final String photoUri,
+		final Jid jid, final int subscription, final String photoUri,
 		final String systemAccount, final String keys, final String avatar,
 		final Lastseen lastseen) {
 		this(account, systemName, serverName, jid, subscription, photoUri, systemAccount, keys,
@@ -55,7 +55,7 @@ public class Contact implements ListItem {
 	}
 
 	public Contact(final String account, final String systemName, final String serverName,
-		final String jid, final int subscription, final String photoUri,
+		final Jid jid, final int subscription, final String photoUri,
 		final String systemAccount, final String keys, final String avatar) {
 		this.accountUuid = account;
 		this.systemName = systemName;
@@ -72,7 +72,7 @@ public class Contact implements ListItem {
 		this.avatar = avatar;
 	}
 
-	public Contact(final String jid) {
+	public Contact(final Jid jid) {
 		this.jid = jid;
 	}
 
@@ -84,7 +84,7 @@ public class Contact implements ListItem {
 		} else if (this.presenceName != null) {
 			return this.presenceName;
 		} else {
-			return this.jid.split("@")[0];
+			return jid.getLocalpart();
 		}
 	}
 
@@ -92,13 +92,13 @@ public class Contact implements ListItem {
 		return this.photoUri;
 	}
 
-	public String getJid() {
-		return this.jid.toLowerCase(Locale.getDefault());
+	public Jid getJid() {
+		return jid;
 	}
 
 	public boolean match(String needle) {
 		return needle == null
-				|| jid.contains(needle.toLowerCase())
+				|| jid.toString().contains(needle.toLowerCase())
 				|| getDisplayName().toLowerCase()
 						.contains(needle.toLowerCase());
 	}
@@ -108,7 +108,7 @@ public class Contact implements ListItem {
 		values.put(ACCOUNT, accountUuid);
 		values.put(SYSTEMNAME, systemName);
 		values.put(SERVERNAME, serverName);
-		values.put(JID, jid);
+		values.put(JID, jid.toString());
 		values.put(OPTIONS, subscription);
 		values.put(SYSTEMACCOUNT, systemAccount);
 		values.put(PHOTOURI, photoUri);
@@ -123,10 +123,17 @@ public class Contact implements ListItem {
 		final Lastseen lastseen = new Lastseen(
 				cursor.getString(cursor.getColumnIndex(LAST_PRESENCE)),
 				cursor.getLong(cursor.getColumnIndex(LAST_TIME)));
-		return new Contact(cursor.getString(cursor.getColumnIndex(ACCOUNT)),
+        final Jid jid;
+        try {
+            jid = Jid.fromString(cursor.getString(cursor.getColumnIndex(JID)));
+        } catch (final InvalidJidException e) {
+            // TODO: Borked DB... handle this somehow?
+            return null;
+        }
+        return new Contact(cursor.getString(cursor.getColumnIndex(ACCOUNT)),
 				cursor.getString(cursor.getColumnIndex(SYSTEMNAME)),
 				cursor.getString(cursor.getColumnIndex(SERVERNAME)),
-				cursor.getString(cursor.getColumnIndex(JID)),
+				jid,
 				cursor.getInt(cursor.getColumnIndex(OPTIONS)),
 				cursor.getString(cursor.getColumnIndex(PHOTOURI)),
 				cursor.getString(cursor.getColumnIndex(SYSTEMACCOUNT)),
@@ -198,7 +205,7 @@ public class Contact implements ListItem {
 	}
 
 	public Set<String> getOtrFingerprints() {
-		Set<String> set = new HashSet<String>();
+		Set<String> set = new HashSet<>();
 		try {
 			if (this.keys.has("otr_fingerprints")) {
 				JSONArray fingerprints = this.keys
@@ -225,7 +232,7 @@ public class Contact implements ListItem {
 			}
 			fingerprints.put(print);
 			this.keys.put("otr_fingerprints", fingerprints);
-		} catch (JSONException e) {
+		} catch (final JSONException ignored) {
 
 		}
 	}
@@ -233,7 +240,7 @@ public class Contact implements ListItem {
 	public void setPgpKeyId(long keyId) {
 		try {
 			this.keys.put("pgp_keyid", keyId);
-		} catch (JSONException e) {
+		} catch (final JSONException ignored) {
 
 		}
 	}
@@ -273,21 +280,26 @@ public class Contact implements ListItem {
 		String subscription = item.getAttribute("subscription");
 
 		if (subscription != null) {
-			if (subscription.equals("to")) {
-				this.resetOption(Contact.Options.FROM);
-				this.setOption(Contact.Options.TO);
-			} else if (subscription.equals("from")) {
-				this.resetOption(Contact.Options.TO);
-				this.setOption(Contact.Options.FROM);
-				this.resetOption(Contact.Options.PREEMPTIVE_GRANT);
-			} else if (subscription.equals("both")) {
-				this.setOption(Contact.Options.TO);
-				this.setOption(Contact.Options.FROM);
-				this.resetOption(Contact.Options.PREEMPTIVE_GRANT);
-			} else if (subscription.equals("none")) {
-				this.resetOption(Contact.Options.FROM);
-				this.resetOption(Contact.Options.TO);
-			}
+            switch (subscription) {
+                case "to":
+                    this.resetOption(Options.FROM);
+                    this.setOption(Options.TO);
+                    break;
+                case "from":
+                    this.resetOption(Options.TO);
+                    this.setOption(Options.FROM);
+                    this.resetOption(Options.PREEMPTIVE_GRANT);
+                    break;
+                case "both":
+                    this.setOption(Options.TO);
+                    this.setOption(Options.FROM);
+                    this.resetOption(Options.PREEMPTIVE_GRANT);
+                    break;
+                case "none":
+                    this.resetOption(Options.FROM);
+                    this.resetOption(Options.TO);
+                    break;
+            }
 		}
 
 		// do NOT override asking if pending push request
@@ -301,8 +313,8 @@ public class Contact implements ListItem {
 	}
 
 	public Element asElement() {
-		Element item = new Element("item");
-		item.setAttribute("jid", this.jid);
+		final Element item = new Element("item");
+		item.setAttribute("jid", this.jid.toString());
 		if (this.serverName != null) {
 			item.setAttribute("name", this.serverName);
 		}
@@ -335,18 +347,13 @@ public class Contact implements ListItem {
 	}
 
 	@Override
-	public int compareTo(ListItem another) {
+	public int compareTo(final ListItem another) {
 		return this.getDisplayName().compareToIgnoreCase(
 				another.getDisplayName());
 	}
 
-	public String getServer() {
-		String[] split = getJid().split("@");
-		if (split.length >= 2) {
-			return split[1];
-		} else {
-			return null;
-		}
+	public Jid getServer() {
+		return getJid().toDomainJid();
 	}
 
 	public boolean setAvatar(String filename) {
diff --git a/src/main/java/eu/siacs/conversations/entities/Conversation.java b/src/main/java/eu/siacs/conversations/entities/Conversation.java
index 9d4c36db5..fdffeccba 100644
--- a/src/main/java/eu/siacs/conversations/entities/Conversation.java
+++ b/src/main/java/eu/siacs/conversations/entities/Conversation.java
@@ -1,13 +1,8 @@
 package eu.siacs.conversations.entities;
 
-import java.security.interfaces.DSAPublicKey;
-import java.util.ArrayList;
-import java.util.List;
-
-import org.json.JSONException;
-import org.json.JSONObject;
-
-import eu.siacs.conversations.services.XmppConnectionService;
+import android.content.ContentValues;
+import android.database.Cursor;
+import android.os.SystemClock;
 
 import net.java.otr4j.OtrException;
 import net.java.otr4j.crypto.OtrCryptoEngineImpl;
@@ -15,9 +10,17 @@ import net.java.otr4j.crypto.OtrCryptoException;
 import net.java.otr4j.session.SessionID;
 import net.java.otr4j.session.SessionImpl;
 import net.java.otr4j.session.SessionStatus;
-import android.content.ContentValues;
-import android.database.Cursor;
-import android.os.SystemClock;
+
+import org.json.JSONException;
+import org.json.JSONObject;
+
+import java.security.interfaces.DSAPublicKey;
+import java.util.ArrayList;
+import java.util.List;
+
+import eu.siacs.conversations.services.XmppConnectionService;
+import eu.siacs.conversations.xmpp.jid.InvalidJidException;
+import eu.siacs.conversations.xmpp.jid.Jid;
 
 public class Conversation extends AbstractEntity {
 	public static final String TABLENAME = "conversations";
@@ -45,7 +48,7 @@ public class Conversation extends AbstractEntity {
 	private String name;
 	private String contactUuid;
 	private String accountUuid;
-	private String contactJid;
+	private Jid contactJid;
 	private int status;
 	private long created;
 	private int mode;
@@ -54,7 +57,7 @@ public class Conversation extends AbstractEntity {
 
 	private String nextPresence;
 
-	protected ArrayList<Message> messages = new ArrayList<Message>();
+	protected ArrayList<Message> messages = new ArrayList<>();
 	protected Account account = null;
 
 	private transient SessionImpl otrSession;
@@ -71,17 +74,17 @@ public class Conversation extends AbstractEntity {
 
 	private Bookmark bookmark;
 
-	public Conversation(String name, Account account, String contactJid,
-			int mode) {
+	public Conversation(final String name, final Account account, final Jid contactJid,
+			final int mode) {
 		this(java.util.UUID.randomUUID().toString(), name, null, account
 				.getUuid(), contactJid, System.currentTimeMillis(),
 				STATUS_AVAILABLE, mode, "");
 		this.account = account;
 	}
 
-	public Conversation(String uuid, String name, String contactUuid,
-			String accountUuid, String contactJid, long created, int status,
-			int mode, String attributes) {
+	public Conversation(final String uuid, final String name, final String contactUuid,
+			final String accountUuid, final Jid contactJid, final long created, final int status,
+			final int mode, final String attributes) {
 		this.uuid = uuid;
 		this.name = name;
 		this.contactUuid = contactUuid;
@@ -91,10 +94,7 @@ public class Conversation extends AbstractEntity {
 		this.status = status;
 		this.mode = mode;
 		try {
-			if (attributes == null) {
-				attributes = new String();
-			}
-			this.attributes = new JSONObject(attributes);
+			this.attributes = new JSONObject(attributes == null ? "" : attributes);
 		} catch (JSONException e) {
 			this.attributes = new JSONObject();
 		}
@@ -105,10 +105,8 @@ public class Conversation extends AbstractEntity {
 	}
 
 	public boolean isRead() {
-		if ((this.messages == null) || (this.messages.size() == 0))
-			return true;
-		return this.messages.get(this.messages.size() - 1).isRead();
-	}
+        return (this.messages == null) || (this.messages.size() == 0) || this.messages.get(this.messages.size() - 1).isRead();
+    }
 
 	public void markRead() {
 		if (this.messages == null) {
@@ -186,7 +184,7 @@ public class Conversation extends AbstractEntity {
 		this.account = account;
 	}
 
-	public String getContactJid() {
+	public Jid getContactJid() {
 		return this.contactJid;
 	}
 
@@ -204,7 +202,7 @@ public class Conversation extends AbstractEntity {
 		values.put(NAME, name);
 		values.put(CONTACT, contactUuid);
 		values.put(ACCOUNT, accountUuid);
-		values.put(CONTACTJID, contactJid);
+		values.put(CONTACTJID, contactJid.toString());
 		values.put(CREATED, created);
 		values.put(STATUS, status);
 		values.put(MODE, mode);
@@ -213,11 +211,18 @@ public class Conversation extends AbstractEntity {
 	}
 
 	public static Conversation fromCursor(Cursor cursor) {
-		return new Conversation(cursor.getString(cursor.getColumnIndex(UUID)),
+        Jid jid;
+        try {
+            jid = Jid.fromString(cursor.getString(cursor.getColumnIndex(CONTACTJID)));
+        } catch (final InvalidJidException e) {
+            // Borked DB..
+            jid = null;
+        }
+        return new Conversation(cursor.getString(cursor.getColumnIndex(UUID)),
 				cursor.getString(cursor.getColumnIndex(NAME)),
 				cursor.getString(cursor.getColumnIndex(CONTACT)),
 				cursor.getString(cursor.getColumnIndex(ACCOUNT)),
-				cursor.getString(cursor.getColumnIndex(CONTACTJID)),
+				jid,
 				cursor.getLong(cursor.getColumnIndex(CREATED)),
 				cursor.getInt(cursor.getColumnIndex(STATUS)),
 				cursor.getInt(cursor.getColumnIndex(MODE)),
@@ -241,8 +246,9 @@ public class Conversation extends AbstractEntity {
 		if (this.otrSession != null) {
 			return this.otrSession;
 		} else {
-			SessionID sessionId = new SessionID(this.getContactJid().split("/",
-					2)[0], presence, "xmpp");
+            final SessionID sessionId = new SessionID(this.getContactJid().toBareJid().toString(),
+                    presence,
+                    "xmpp");
 			this.otrSession = new SessionImpl(sessionId, getAccount()
 					.getOtrEngine(service));
 			try {
@@ -317,7 +323,7 @@ public class Conversation extends AbstractEntity {
 				builder.insert(26, " ");
 				builder.insert(35, " ");
 				this.otrFingerprint = builder.toString();
-			} catch (OtrCryptoException e) {
+			} catch (final OtrCryptoException ignored) {
 
 			}
 		}
@@ -335,7 +341,7 @@ public class Conversation extends AbstractEntity {
 		this.mucOptions = null;
 	}
 
-	public void setContactJid(String jid) {
+	public void setContactJid(final Jid jid) {
 		this.contactJid = jid;
 	}
 
diff --git a/src/main/java/eu/siacs/conversations/entities/ListItem.java b/src/main/java/eu/siacs/conversations/entities/ListItem.java
index a1872d2f2..fa650f1c8 100644
--- a/src/main/java/eu/siacs/conversations/entities/ListItem.java
+++ b/src/main/java/eu/siacs/conversations/entities/ListItem.java
@@ -1,7 +1,9 @@
 package eu.siacs.conversations.entities;
 
+import eu.siacs.conversations.xmpp.jid.Jid;
+
 public interface ListItem extends Comparable<ListItem> {
 	public String getDisplayName();
 
-	public String getJid();
+	public Jid getJid();
 }
diff --git a/src/main/java/eu/siacs/conversations/entities/Message.java b/src/main/java/eu/siacs/conversations/entities/Message.java
index b33d5f375..ce21addc8 100644
--- a/src/main/java/eu/siacs/conversations/entities/Message.java
+++ b/src/main/java/eu/siacs/conversations/entities/Message.java
@@ -5,6 +5,9 @@ import java.net.URL;
 import java.util.Arrays;
 
 import eu.siacs.conversations.Config;
+import eu.siacs.conversations.xmpp.jid.InvalidJidException;
+import eu.siacs.conversations.xmpp.jid.Jid;
+
 import android.content.ContentValues;
 import android.database.Cursor;
 
@@ -44,7 +47,7 @@ public class Message extends AbstractEntity {
 	public static String REMOTE_MSG_ID = "remoteMsgId";
 
 	protected String conversationUuid;
-	protected String counterpart;
+	protected Jid counterpart;
 	protected String trueCounterpart;
 	protected String body;
 	protected String encryptedBody;
@@ -74,17 +77,17 @@ public class Message extends AbstractEntity {
 		this.conversation = conversation;
 	}
 
-	public Message(Conversation conversation, String counterpart, String body,
-			int encryption, int status) {
+	public Message(final Conversation conversation, final Jid counterpart, final String body,
+			final int encryption, final int status) {
 		this(java.util.UUID.randomUUID().toString(), conversation.getUuid(),
 				counterpart, null, body, System.currentTimeMillis(),
 				encryption, status, TYPE_TEXT, null);
 		this.conversation = conversation;
 	}
 
-	public Message(String uuid, String conversationUUid, String counterpart,
-			String trueCounterpart, String body, long timeSent, int encryption,
-			int status, int type, String remoteMsgId) {
+	public Message(final String uuid, final String conversationUUid, final Jid counterpart,
+			final String trueCounterpart, final String body, final long timeSent,
+            final int encryption, final int status, final int type, final String remoteMsgId) {
 		this.uuid = uuid;
 		this.conversationUuid = conversationUUid;
 		this.counterpart = counterpart;
@@ -102,7 +105,7 @@ public class Message extends AbstractEntity {
 		ContentValues values = new ContentValues();
 		values.put(UUID, uuid);
 		values.put(CONVERSATION, conversationUuid);
-		values.put(COUNTERPART, counterpart);
+		values.put(COUNTERPART, counterpart.toString());
 		values.put(TRUE_COUNTERPART, trueCounterpart);
 		values.put(BODY, body);
 		values.put(TIME_SENT, timeSent);
@@ -121,7 +124,7 @@ public class Message extends AbstractEntity {
 		return this.conversation;
 	}
 
-	public String getCounterpart() {
+	public Jid getCounterpart() {
 		return counterpart;
 	}
 
@@ -163,9 +166,15 @@ public class Message extends AbstractEntity {
 	}
 
 	public static Message fromCursor(Cursor cursor) {
-		return new Message(cursor.getString(cursor.getColumnIndex(UUID)),
+        Jid jid;
+        try {
+            jid = Jid.fromString(cursor.getString(cursor.getColumnIndex(COUNTERPART)));
+        } catch (InvalidJidException e) {
+            jid = null;
+        }
+        return new Message(cursor.getString(cursor.getColumnIndex(UUID)),
 				cursor.getString(cursor.getColumnIndex(CONVERSATION)),
-				cursor.getString(cursor.getColumnIndex(COUNTERPART)),
+				jid,
 				cursor.getString(cursor.getColumnIndex(TRUE_COUNTERPART)),
 				cursor.getString(cursor.getColumnIndex(BODY)),
 				cursor.getLong(cursor.getColumnIndex(TIME_SENT)),
@@ -225,11 +234,14 @@ public class Message extends AbstractEntity {
 
 	public void setPresence(String presence) {
 		if (presence == null) {
-			this.counterpart = this.counterpart.split("/", 2)[0];
+			this.counterpart = this.counterpart.toBareJid();
 		} else {
-			this.counterpart = this.counterpart.split("/", 2)[0] + "/"
-					+ presence;
-		}
+            try {
+                this.counterpart = Jid.fromString(this.counterpart.toBareJid() + "/" + presence);
+            } catch (final InvalidJidException ignored) {
+                // TODO: Handle this?
+            }
+        }
 	}
 
 	public void setTrueCounterpart(String trueCounterpart) {
@@ -237,15 +249,11 @@ public class Message extends AbstractEntity {
 	}
 
 	public String getPresence() {
-		String[] counterparts = this.counterpart.split("/", 2);
-		if (counterparts.length == 2) {
-			return counterparts[1];
+		if (!counterpart.getResourcepart().isEmpty()) {
+			return counterpart.getResourcepart();
 		} else {
-			if (this.counterpart.contains("/")) {
-				return "";
-			} else {
-				return null;
-			}
+            // TODO: Return empty string or null?
+			return null;
 		}
 	}
 
@@ -264,7 +272,7 @@ public class Message extends AbstractEntity {
 		return message;
 	}
 
-	public void setCounterpart(String counterpart) {
+	public void setCounterpart(final Jid counterpart) {
 		this.counterpart = counterpart;
 	}
 
@@ -359,11 +367,7 @@ public class Message extends AbstractEntity {
 
 	public boolean wasMergedIntoPrevious() {
 		Message prev = this.prev();
-		if (prev == null) {
-			return false;
-		} else {
-			return prev.mergeable(this);
-		}
+        return prev != null && prev.mergeable(this);
 	}
 	
 	public boolean trusted() {
diff --git a/src/main/java/eu/siacs/conversations/entities/MucOptions.java b/src/main/java/eu/siacs/conversations/entities/MucOptions.java
index d7407cd5e..f83387fc0 100644
--- a/src/main/java/eu/siacs/conversations/entities/MucOptions.java
+++ b/src/main/java/eu/siacs/conversations/entities/MucOptions.java
@@ -6,6 +6,8 @@ import java.util.concurrent.CopyOnWriteArrayList;
 
 import eu.siacs.conversations.crypto.PgpEngine;
 import eu.siacs.conversations.xml.Element;
+import eu.siacs.conversations.xmpp.jid.InvalidJidException;
+import eu.siacs.conversations.xmpp.jid.Jid;
 import eu.siacs.conversations.xmpp.stanzas.PresencePacket;
 import android.annotation.SuppressLint;
 
@@ -66,15 +68,20 @@ public class MucOptions {
 
 		public void setRole(String role) {
 			role = role.toLowerCase();
-			if (role.equals("moderator")) {
-				this.role = ROLE_MODERATOR;
-			} else if (role.equals("participant")) {
-				this.role = ROLE_PARTICIPANT;
-			} else if (role.equals("visitor")) {
-				this.role = ROLE_VISITOR;
-			} else {
-				this.role = ROLE_NONE;
-			}
+            switch (role) {
+                case "moderator":
+                    this.role = ROLE_MODERATOR;
+                    break;
+                case "participant":
+                    this.role = ROLE_PARTICIPANT;
+                    break;
+                case "visitor":
+                    this.role = ROLE_VISITOR;
+                    break;
+                default:
+                    this.role = ROLE_NONE;
+                    break;
+            }
 		}
 
 		public int getAffiliation() {
@@ -109,7 +116,7 @@ public class MucOptions {
 	}
 
 	private Account account;
-	private List<User> users = new CopyOnWriteArrayList<User>();
+	private List<User> users = new CopyOnWriteArrayList<>();
 	private Conversation conversation;
 	private boolean isOnline = false;
 	private int error = ERROR_ROOM_NOT_FOUND;
@@ -233,13 +240,12 @@ public class MucOptions {
 	}
 
 	public String getProposedNick() {
-		String[] mucParts = conversation.getContactJid().split("/", 2);
 		if (conversation.getBookmark() != null
 				&& conversation.getBookmark().getNick() != null) {
 			return conversation.getBookmark().getNick();
 		} else {
-			if (mucParts.length == 2) {
-				return mucParts[1];
+			if (!conversation.getContactJid().getResourcepart().isEmpty()) {
+				return conversation.getContactJid().getResourcepart();
 			} else {
 				return account.getUsername();
 			}
@@ -297,7 +303,7 @@ public class MucOptions {
 	}
 
 	public long[] getPgpKeyIds() {
-		List<Long> ids = new ArrayList<Long>();
+		List<Long> ids = new ArrayList<>();
 		for (User user : getUsers()) {
 			if (user.getPgpKeyId() != 0) {
 				ids.add(user.getPgpKeyId());
@@ -328,10 +334,14 @@ public class MucOptions {
 		return true;
 	}
 
-	public String getJoinJid() {
-		return this.conversation.getContactJid().split("/", 2)[0] + "/"
-				+ this.joinnick;
-	}
+	public Jid getJoinJid() {
+        try {
+            return Jid.fromString(this.conversation.getContactJid().toBareJid().toString() + "/"
++ this.joinnick);
+        } catch (final InvalidJidException e) {
+            return null;
+        }
+    }
 
 	public String getTrueCounterpart(String counterpart) {
 		for (User user : this.getUsers()) {
diff --git a/src/main/java/eu/siacs/conversations/entities/Roster.java b/src/main/java/eu/siacs/conversations/entities/Roster.java
index 3267b15ae..27d4deb02 100644
--- a/src/main/java/eu/siacs/conversations/entities/Roster.java
+++ b/src/main/java/eu/siacs/conversations/entities/Roster.java
@@ -2,12 +2,13 @@ package eu.siacs.conversations.entities;
 
 import java.util.ArrayList;
 import java.util.List;
-import java.util.Locale;
 import java.util.concurrent.ConcurrentHashMap;
 
+import eu.siacs.conversations.xmpp.jid.Jid;
+
 public class Roster {
 	Account account;
-	ConcurrentHashMap<String, Contact> contacts = new ConcurrentHashMap<String, Contact>();
+	final ConcurrentHashMap<String, Contact> contacts = new ConcurrentHashMap<>();
 	private String version = null;
 
 	public Roster(Account account) {
@@ -27,14 +28,14 @@ public class Roster {
 		}
 	}
 
-	public Contact getContact(String jid) {
-		String cleanJid = jid.split("/", 2)[0].toLowerCase(Locale.getDefault());
-		if (contacts.containsKey(cleanJid)) {
-			return contacts.get(cleanJid);
+	public Contact getContact(final Jid jid) {
+		final Jid bareJid = jid.toBareJid();
+		if (contacts.containsKey(bareJid.toString())) {
+			return contacts.get(bareJid.toString());
 		} else {
-			Contact contact = new Contact(cleanJid);
+			Contact contact = new Contact(bareJid);
 			contact.setAccount(account);
-			contacts.put(cleanJid, contact);
+			contacts.put(bareJid.toString(), contact);
 			return contact;
 		}
 	}
@@ -60,13 +61,13 @@ public class Roster {
 	}
 
 	public List<Contact> getContacts() {
-		return new ArrayList<Contact>(this.contacts.values());
+		return new ArrayList<>(this.contacts.values());
 	}
 
-	public void initContact(Contact contact) {
+	public void initContact(final Contact contact) {
 		contact.setAccount(account);
 		contact.setOption(Contact.Options.IN_ROSTER);
-		contacts.put(contact.getJid(), contact);
+		contacts.put(contact.getJid().toBareJid().toString(), contact);
 	}
 
 	public void setVersion(String version) {
diff --git a/src/main/java/eu/siacs/conversations/generator/IqGenerator.java b/src/main/java/eu/siacs/conversations/generator/IqGenerator.java
index d44bf0ca1..2f6df523b 100644
--- a/src/main/java/eu/siacs/conversations/generator/IqGenerator.java
+++ b/src/main/java/eu/siacs/conversations/generator/IqGenerator.java
@@ -6,6 +6,7 @@ import java.util.List;
 
 import eu.siacs.conversations.services.XmppConnectionService;
 import eu.siacs.conversations.xml.Element;
+import eu.siacs.conversations.xmpp.jid.Jid;
 import eu.siacs.conversations.xmpp.pep.Avatar;
 import eu.siacs.conversations.xmpp.stanzas.IqPacket;
 
@@ -18,7 +19,7 @@ public class IqGenerator extends AbstractGenerator {
 	public IqPacket discoResponse(IqPacket request) {
 		IqPacket packet = new IqPacket(IqPacket.TYPE_RESULT);
 		packet.setId(request.getId());
-		packet.setTo(request.getFrom());
+		packet.setAttribute("to", request.getFrom());
 		Element query = packet.addChild("query",
 				"http://jabber.org/protocol/disco#info");
 		query.setAttribute("node", request.query().getAttribute("node"));
@@ -86,8 +87,8 @@ public class IqGenerator extends AbstractGenerator {
 		return packet;
 	}
 
-	public IqPacket retrieveAvatarMetaData(String to) {
-		IqPacket packet = retrieve("urn:xmpp:avatar:metadata", null);
+	public IqPacket retrieveAvatarMetaData(final Jid to) {
+		final IqPacket packet = retrieve("urn:xmpp:avatar:metadata", null);
 		if (to != null) {
 			packet.setTo(to);
 		}
diff --git a/src/main/java/eu/siacs/conversations/generator/MessageGenerator.java b/src/main/java/eu/siacs/conversations/generator/MessageGenerator.java
index dd833e56c..d53346b01 100644
--- a/src/main/java/eu/siacs/conversations/generator/MessageGenerator.java
+++ b/src/main/java/eu/siacs/conversations/generator/MessageGenerator.java
@@ -12,6 +12,7 @@ import eu.siacs.conversations.entities.Conversation;
 import eu.siacs.conversations.entities.Message;
 import eu.siacs.conversations.services.XmppConnectionService;
 import eu.siacs.conversations.xml.Element;
+import eu.siacs.conversations.xmpp.jid.Jid;
 import eu.siacs.conversations.xmpp.stanzas.MessagePacket;
 
 public class MessageGenerator extends AbstractGenerator {
@@ -34,7 +35,7 @@ public class MessageGenerator extends AbstractGenerator {
 			packet.setTo(message.getCounterpart());
 			packet.setType(MessagePacket.TYPE_CHAT);
 		} else {
-			packet.setTo(message.getCounterpart().split("/", 2)[0]);
+			packet.setTo(message.getCounterpart().toBareJid());
 			packet.setType(MessagePacket.TYPE_GROUPCHAT);
 		}
 		packet.setFrom(account.getFullJid());
@@ -113,13 +114,13 @@ public class MessageGenerator extends AbstractGenerator {
 	private MessagePacket generateError(MessagePacket origin) {
 		MessagePacket packet = new MessagePacket();
 		packet.setId(origin.getId());
-		packet.setTo(origin.getFrom());
+		packet.setAttribute("to", origin.getFrom());
 		packet.setBody(origin.getBody());
 		packet.setType(MessagePacket.TYPE_ERROR);
 		return packet;
 	}
 
-	public MessagePacket confirm(Account account, String to, String id) {
+	public MessagePacket confirm(final Account account, final Jid to, final String id) {
 		MessagePacket packet = new MessagePacket();
 		packet.setType(MessagePacket.TYPE_NORMAL);
 		packet.setTo(to);
@@ -134,7 +135,7 @@ public class MessageGenerator extends AbstractGenerator {
 			String subject) {
 		MessagePacket packet = new MessagePacket();
 		packet.setType(MessagePacket.TYPE_GROUPCHAT);
-		packet.setTo(conversation.getContactJid().split("/", 2)[0]);
+		packet.setTo(conversation.getContactJid().toBareJid());
 		Element subjectChild = new Element("subject");
 		subjectChild.setContent(subject);
 		packet.addChild(subjectChild);
@@ -142,19 +143,19 @@ public class MessageGenerator extends AbstractGenerator {
 		return packet;
 	}
 
-	public MessagePacket directInvite(Conversation conversation, String contact) {
+	public MessagePacket directInvite(final Conversation conversation, final Jid contact) {
 		MessagePacket packet = new MessagePacket();
 		packet.setType(MessagePacket.TYPE_NORMAL);
 		packet.setTo(contact);
 		packet.setFrom(conversation.getAccount().getFullJid());
 		Element x = packet.addChild("x", "jabber:x:conference");
-		x.setAttribute("jid", conversation.getContactJid().split("/", 2)[0]);
+		x.setAttribute("jid", conversation.getContactJid().toBareJid().toString());
 		return packet;
 	}
 
 	public MessagePacket invite(Conversation conversation, String contact) {
 		MessagePacket packet = new MessagePacket();
-		packet.setTo(conversation.getContactJid().split("/", 2)[0]);
+		packet.setTo(conversation.getContactJid().toBareJid());
 		packet.setFrom(conversation.getAccount().getFullJid());
 		Element x = new Element("x");
 		x.setAttribute("xmlns", "http://jabber.org/protocol/muc#user");
@@ -169,7 +170,7 @@ public class MessageGenerator extends AbstractGenerator {
 			MessagePacket originalMessage, String namespace) {
 		MessagePacket receivedPacket = new MessagePacket();
 		receivedPacket.setType(MessagePacket.TYPE_NORMAL);
-		receivedPacket.setTo(originalMessage.getFrom());
+		receivedPacket.setAttribute("to", originalMessage.getFrom());
 		receivedPacket.setFrom(account.getFullJid());
 		Element received = receivedPacket.addChild("received", namespace);
 		received.setAttribute("id", originalMessage.getId());
diff --git a/src/main/java/eu/siacs/conversations/generator/PresenceGenerator.java b/src/main/java/eu/siacs/conversations/generator/PresenceGenerator.java
index d896dd001..6036c8021 100644
--- a/src/main/java/eu/siacs/conversations/generator/PresenceGenerator.java
+++ b/src/main/java/eu/siacs/conversations/generator/PresenceGenerator.java
@@ -15,8 +15,8 @@ public class PresenceGenerator extends AbstractGenerator {
 	private PresencePacket subscription(String type, Contact contact) {
 		PresencePacket packet = new PresencePacket();
 		packet.setAttribute("type", type);
-		packet.setAttribute("to", contact.getJid());
-		packet.setAttribute("from", contact.getAccount().getJid());
+		packet.setTo(contact.getJid());
+		packet.setFrom(contact.getAccount().getJid());
 		return packet;
 	}
 
@@ -38,7 +38,7 @@ public class PresenceGenerator extends AbstractGenerator {
 
 	public PresencePacket sendPresence(Account account) {
 		PresencePacket packet = new PresencePacket();
-		packet.setAttribute("from", account.getFullJid());
+		packet.setFrom(account.getFullJid());
 		String sig = account.getPgpSignature();
 		if (sig != null) {
 			packet.addChild("status").setContent("online");
diff --git a/src/main/java/eu/siacs/conversations/parser/AbstractParser.java b/src/main/java/eu/siacs/conversations/parser/AbstractParser.java
index 5541c1c61..9e4130524 100644
--- a/src/main/java/eu/siacs/conversations/parser/AbstractParser.java
+++ b/src/main/java/eu/siacs/conversations/parser/AbstractParser.java
@@ -11,6 +11,8 @@ import eu.siacs.conversations.entities.Account;
 import eu.siacs.conversations.entities.Contact;
 import eu.siacs.conversations.services.XmppConnectionService;
 import eu.siacs.conversations.xml.Element;
+import eu.siacs.conversations.xmpp.jid.InvalidJidException;
+import eu.siacs.conversations.xmpp.jid.Jid;
 
 public abstract class AbstractParser {
 
@@ -22,7 +24,7 @@ public abstract class AbstractParser {
 
 	protected long getTimestamp(Element packet) {
 		long now = System.currentTimeMillis();
-		ArrayList<String> stamps = new ArrayList<String>();
+		ArrayList<String> stamps = new ArrayList<>();
 		for (Element child : packet.getChildren()) {
 			if (child.getName().equals("delay")) {
 				stamps.add(child.getAttribute("stamp").replace("Z", "+0000"));
@@ -58,21 +60,21 @@ public abstract class AbstractParser {
 		}
 	}
 
-	protected void updateLastseen(Element packet, Account account,
-			boolean presenceOverwrite) {
-		String[] fromParts = packet.getAttribute("from").split("/", 2);
-		String from = fromParts[0];
-		String presence = null;
-		if (fromParts.length >= 2) {
-			presence = fromParts[1];
-		} else {
-			presence = "";
-		}
+	protected void updateLastseen(final Element packet, final Account account,
+			final boolean presenceOverwrite) {
+        Jid from;
+        try {
+            from = Jid.fromString(packet.getAttribute("from")).toBareJid();
+        } catch (final InvalidJidException e) {
+            // TODO: Handle this?
+            from = null;
+        }
+        String presence = from == null || from.getResourcepart().isEmpty() ? "" : from.getResourcepart();
 		Contact contact = account.getRoster().getContact(from);
 		long timestamp = getTimestamp(packet);
 		if (timestamp >= contact.lastseen.time) {
 			contact.lastseen.time = timestamp;
-			if ((presence != null) && (presenceOverwrite)) {
+			if (!presence.isEmpty() && presenceOverwrite) {
 				contact.lastseen.presence = presence;
 			}
 		}
diff --git a/src/main/java/eu/siacs/conversations/parser/IqParser.java b/src/main/java/eu/siacs/conversations/parser/IqParser.java
index df6754f26..1c66da263 100644
--- a/src/main/java/eu/siacs/conversations/parser/IqParser.java
+++ b/src/main/java/eu/siacs/conversations/parser/IqParser.java
@@ -5,6 +5,8 @@ import eu.siacs.conversations.entities.Contact;
 import eu.siacs.conversations.services.XmppConnectionService;
 import eu.siacs.conversations.xml.Element;
 import eu.siacs.conversations.xmpp.OnIqPacketReceived;
+import eu.siacs.conversations.xmpp.jid.InvalidJidException;
+import eu.siacs.conversations.xmpp.jid.Jid;
 import eu.siacs.conversations.xmpp.stanzas.IqPacket;
 
 public class IqParser extends AbstractParser implements OnIqPacketReceived {
@@ -20,8 +22,14 @@ public class IqParser extends AbstractParser implements OnIqPacketReceived {
 		}
 		for (Element item : query.getChildren()) {
 			if (item.getName().equals("item")) {
-				String jid = item.getAttribute("jid");
-				String name = item.getAttribute("name");
+                Jid jid;
+                try {
+                    jid = Jid.fromString(item.getAttribute("jid"));
+                } catch (final InvalidJidException e) {
+                    // TODO: Handle this?
+                    jid = null;
+                }
+                String name = item.getAttribute("name");
 				String subscription = item.getAttribute("subscription");
 				Contact contact = account.getRoster().getContact(jid);
 				if (!contact.getOption(Contact.Options.DIRTY_PUSH)) {
@@ -59,8 +67,13 @@ public class IqParser extends AbstractParser implements OnIqPacketReceived {
 	@Override
 	public void onIqPacketReceived(Account account, IqPacket packet) {
 		if (packet.hasChild("query", "jabber:iq:roster")) {
-			String from = packet.getFrom();
-			if ((from == null) || (from.equals(account.getJid()))) {
+            Jid from = null;
+            try {
+                from = Jid.fromString(packet.getFrom());
+            } catch (final InvalidJidException e) {
+                // TODO: Handle this?
+            }
+            if ((from == null) || (from.equals(account.getJid()))) {
 				Element query = packet.findChild("query");
 				this.rosterItems(account, query);
 			}
diff --git a/src/main/java/eu/siacs/conversations/persistance/DatabaseBackend.java b/src/main/java/eu/siacs/conversations/persistance/DatabaseBackend.java
index ef045546b..310c8f420 100644
--- a/src/main/java/eu/siacs/conversations/persistance/DatabaseBackend.java
+++ b/src/main/java/eu/siacs/conversations/persistance/DatabaseBackend.java
@@ -9,6 +9,8 @@ import eu.siacs.conversations.entities.Contact;
 import eu.siacs.conversations.entities.Conversation;
 import eu.siacs.conversations.entities.Message;
 import eu.siacs.conversations.entities.Roster;
+import eu.siacs.conversations.xmpp.jid.Jid;
+
 import android.content.Context;
 import android.database.Cursor;
 import android.database.sqlite.SQLiteCantOpenDatabaseException;
@@ -147,7 +149,7 @@ public class DatabaseBackend extends SQLiteOpenHelper {
 	}
 
 	public CopyOnWriteArrayList<Conversation> getConversations(int status) {
-		CopyOnWriteArrayList<Conversation> list = new CopyOnWriteArrayList<Conversation>();
+		CopyOnWriteArrayList<Conversation> list = new CopyOnWriteArrayList<>();
 		SQLiteDatabase db = this.getReadableDatabase();
 		String[] selectionArgs = { Integer.toString(status) };
 		Cursor cursor = db.rawQuery("select * from " + Conversation.TABLENAME
@@ -165,7 +167,7 @@ public class DatabaseBackend extends SQLiteOpenHelper {
 
 	public ArrayList<Message> getMessages(Conversation conversation, int limit,
 			long timestamp) {
-		ArrayList<Message> list = new ArrayList<Message>();
+		ArrayList<Message> list = new ArrayList<>();
 		SQLiteDatabase db = this.getReadableDatabase();
 		Cursor cursor;
 		if (timestamp == -1) {
@@ -192,9 +194,9 @@ public class DatabaseBackend extends SQLiteOpenHelper {
 		return list;
 	}
 
-	public Conversation findConversation(Account account, String contactJid) {
+	public Conversation findConversation(final Account account, final Jid contactJid) {
 		SQLiteDatabase db = this.getReadableDatabase();
-		String[] selectionArgs = { account.getUuid(), contactJid + "%" };
+		String[] selectionArgs = { account.getUuid(), contactJid.toBareJid().toString() + "%" };
 		Cursor cursor = db.query(Conversation.TABLENAME, null,
 				Conversation.ACCOUNT + "=? AND " + Conversation.CONTACTJID
 						+ " like ?", selectionArgs, null, null, null);
@@ -212,7 +214,7 @@ public class DatabaseBackend extends SQLiteOpenHelper {
 	}
 
 	public List<Account> getAccounts() {
-		List<Account> list = new ArrayList<Account>();
+		List<Account> list = new ArrayList<>();
 		SQLiteDatabase db = this.getReadableDatabase();
 		Cursor cursor = db.query(Account.TABLENAME, null, null, null, null,
 				null, null);
@@ -276,15 +278,15 @@ public class DatabaseBackend extends SQLiteOpenHelper {
 		cursor.close();
 	}
 
-	public void writeRoster(Roster roster) {
-		Account account = roster.getAccount();
-		SQLiteDatabase db = this.getWritableDatabase();
+	public void writeRoster(final Roster roster) {
+		final Account account = roster.getAccount();
+		final SQLiteDatabase db = this.getWritableDatabase();
 		for (Contact contact : roster.getContacts()) {
 			if (contact.getOption(Contact.Options.IN_ROSTER)) {
 				db.insert(Contact.TABLENAME, null, contact.getContentValues());
 			} else {
 				String where = Contact.ACCOUNT + "=? AND " + Contact.JID + "=?";
-				String[] whereArgs = { account.getUuid(), contact.getJid() };
+				String[] whereArgs = { account.getUuid(), contact.getJid().toString() };
 				db.delete(Contact.TABLENAME, where, whereArgs);
 			}
 		}
@@ -341,7 +343,7 @@ public class DatabaseBackend extends SQLiteOpenHelper {
 	}
 
 	public List<Message> getImageMessages(Conversation conversation) {
-		ArrayList<Message> list = new ArrayList<Message>();
+		ArrayList<Message> list = new ArrayList<>();
 		SQLiteDatabase db = this.getReadableDatabase();
 		Cursor cursor;
 			String[] selectionArgs = { conversation.getUuid(), String.valueOf(Message.TYPE_IMAGE) };
diff --git a/src/main/java/eu/siacs/conversations/services/XmppConnectionService.java b/src/main/java/eu/siacs/conversations/services/XmppConnectionService.java
index ea6f509fd..272688980 100644
--- a/src/main/java/eu/siacs/conversations/services/XmppConnectionService.java
+++ b/src/main/java/eu/siacs/conversations/services/XmppConnectionService.java
@@ -55,6 +55,8 @@ import eu.siacs.conversations.xmpp.OnIqPacketReceived;
 import eu.siacs.conversations.xmpp.OnMessageAcknowledged;
 import eu.siacs.conversations.xmpp.OnStatusChanged;
 import eu.siacs.conversations.xmpp.XmppConnection;
+import eu.siacs.conversations.xmpp.jid.InvalidJidException;
+import eu.siacs.conversations.xmpp.jid.Jid;
 import eu.siacs.conversations.xmpp.jingle.JingleConnectionManager;
 import eu.siacs.conversations.xmpp.jingle.OnJinglePacketReceived;
 import eu.siacs.conversations.xmpp.jingle.stanzas.JinglePacket;
@@ -91,8 +93,6 @@ public class XmppConnectionService extends Service {
 	public DatabaseBackend databaseBackend;
 	private FileBackend fileBackend = new FileBackend(this);
 
-	public long startDate;
-
 	private static String ACTION_MERGE_PHONE_CONTACTS = "merge_phone_contacts";
 	public static String ACTION_CLEAR_NOTIFICATION = "clear_notification";
 
@@ -171,7 +171,6 @@ public class XmppConnectionService extends Service {
 			XmppConnection connection = account.getXmppConnection();
 			if (mOnAccountUpdate != null) {
 				mOnAccountUpdate.onAccountUpdate();
-				;
 			}
 			if (account.getStatus() == Account.STATUS_ONLINE) {
 				for (Conversation conversation : account.pendingConferenceLeaves) {
@@ -182,12 +181,12 @@ public class XmppConnectionService extends Service {
 				}
 				mJingleConnectionManager.cancelInTransmission();
 				List<Conversation> conversations = getConversations();
-				for (int i = 0; i < conversations.size(); ++i) {
-					if (conversations.get(i).getAccount() == account) {
-						conversations.get(i).startOtrIfNeeded();
-						sendUnsendMessages(conversations.get(i));
-					}
-				}
+                for (Conversation conversation : conversations) {
+                    if (conversation.getAccount() == account) {
+                        conversation.startOtrIfNeeded();
+                        sendUnsendMessages(conversation);
+                    }
+                }
 				if (connection != null && connection.getFeatures().csi()) {
 					if (checkListeners()) {
 						Log.d(Config.LOGTAG, account.getJid()
@@ -335,7 +334,7 @@ public class XmppConnectionService extends Service {
 		return find(bookmark.getAccount(), bookmark.getJid());
 	}
 
-	public Conversation find(Account account, String jid) {
+	public Conversation find(final Account account, final Jid jid) {
 		return find(getConversations(), account, jid);
 	}
 
@@ -415,7 +414,7 @@ public class XmppConnectionService extends Service {
 		if (wakeLock.isHeld()) {
 			try {
 				wakeLock.release();
-			} catch (RuntimeException re) {
+			} catch (final RuntimeException ignored) {
 			}
 		}
 		return START_STICKY;
@@ -536,9 +535,12 @@ public class XmppConnectionService extends Service {
 
 	public XmppConnection createConnection(Account account) {
 		SharedPreferences sharedPref = getPreferences();
-		account.setResource(sharedPref.getString("resource", "mobile")
-				.toLowerCase(Locale.getDefault()));
-		XmppConnection connection = new XmppConnection(account, this);
+        try {
+            account.setResource(sharedPref.getString("resource", "mobile")
+                    .toLowerCase(Locale.getDefault()));
+        } catch (final InvalidJidException ignored) {
+        }
+        XmppConnection connection = new XmppConnection(account, this);
 		connection.setOnMessagePacketReceivedListener(this.mMessageParser);
 		connection.setOnStatusChangedListener(this.statusListener);
 		connection.setOnPresencePacketReceivedListener(this.mPresenceParser);
@@ -757,7 +759,7 @@ public class XmppConnectionService extends Service {
 			@Override
 			public void onIqPacketReceived(Account account, IqPacket packet) {
 				Element query = packet.query();
-				List<Bookmark> bookmarks = new CopyOnWriteArrayList<Bookmark>();
+				List<Bookmark> bookmarks = new CopyOnWriteArrayList<>();
 				Element storage = query.findChild("storage",
 						"storage:bookmarks");
 				if (storage != null) {
@@ -806,8 +808,14 @@ public class XmppConnectionService extends Service {
 						}
 						for (Bundle phoneContact : phoneContacts) {
 							for (Account account : accounts) {
-								String jid = phoneContact.getString("jid");
-								Contact contact = account.getRoster()
+                                Jid jid;
+                                try {
+                                    jid = Jid.fromString(phoneContact.getString("jid"));
+                                } catch (final InvalidJidException e) {
+                                    // TODO: Warn if contact import fails here?
+                                    break;
+                                }
+                                final Contact contact = account.getRoster()
 										.getContact(jid);
 								String systemAccount = phoneContact
 										.getInt("phoneid")
@@ -827,7 +835,7 @@ public class XmppConnectionService extends Service {
 
 	public List<Conversation> getConversations() {
 		if (this.conversations == null) {
-			Hashtable<String, Account> accountLookupTable = new Hashtable<String, Account>();
+			Hashtable<String, Account> accountLookupTable = new Hashtable<>();
 			for (Account account : this.accounts) {
 				accountLookupTable.put(account.getUuid(), account);
 			}
@@ -925,20 +933,20 @@ public class XmppConnectionService extends Service {
 		return null;
 	}
 
-	public Conversation find(List<Conversation> haystack, Account account,
-			String jid) {
+	public Conversation find(final List<Conversation> haystack,
+                             final Account account,
+                             final Jid jid) {
 		for (Conversation conversation : haystack) {
 			if ((account == null || conversation.getAccount() == account)
-					&& (conversation.getContactJid().split("/", 2)[0]
-							.equalsIgnoreCase(jid))) {
+					&& (conversation.getContactJid().toBareJid().equals(jid.toBareJid()))) {
 				return conversation;
 			}
 		}
 		return null;
 	}
 
-	public Conversation findOrCreateConversation(Account account, String jid,
-			boolean muc) {
+	public Conversation findOrCreateConversation(final Account account, final Jid jid,
+			final boolean muc) {
 		Conversation conversation = find(account, jid);
 		if (conversation != null) {
 			return conversation;
@@ -961,7 +969,7 @@ public class XmppConnectionService extends Service {
 			if (contact != null) {
 				conversationName = contact.getDisplayName();
 			} else {
-				conversationName = jid.split("@")[0];
+				conversationName = jid.getLocalpart();
 			}
 			if (muc) {
 				conversation = new Conversation(conversationName, account, jid,
@@ -1163,13 +1171,12 @@ public class XmppConnectionService extends Service {
 
 	public void connectMultiModeConversations(Account account) {
 		List<Conversation> conversations = getConversations();
-		for (int i = 0; i < conversations.size(); i++) {
-			Conversation conversation = conversations.get(i);
-			if ((conversation.getMode() == Conversation.MODE_MULTI)
-					&& (conversation.getAccount() == account)) {
-				joinMuc(conversation);
-			}
-		}
+        for (Conversation conversation : conversations) {
+            if ((conversation.getMode() == Conversation.MODE_MULTI)
+                    && (conversation.getAccount() == account)) {
+                joinMuc(conversation);
+            }
+        }
 	}
 
 	public void joinMuc(Conversation conversation) {
@@ -1182,8 +1189,8 @@ public class XmppConnectionService extends Service {
 			String nick = conversation.getMucOptions().getProposedNick();
 			conversation.getMucOptions().setJoinNick(nick);
 			PresencePacket packet = new PresencePacket();
-			String joinJid = conversation.getMucOptions().getJoinJid();
-			packet.setAttribute("to", conversation.getMucOptions().getJoinJid());
+			final Jid joinJid = conversation.getMucOptions().getJoinJid();
+            packet.setTo(conversation.getMucOptions().getJoinJid());
 			Element x = new Element("x");
 			x.setAttribute("xmlns", "http://jabber.org/protocol/muc");
 			if (conversation.getMucOptions().getPassword() != null) {
@@ -1260,8 +1267,8 @@ public class XmppConnectionService extends Service {
 			});
 			options.flagAboutToRename();
 			PresencePacket packet = new PresencePacket();
-			packet.setAttribute("to", options.getJoinJid());
-			packet.setAttribute("from", conversation.getAccount().getFullJid());
+			packet.setTo(options.getJoinJid());
+			packet.setFrom(conversation.getAccount().getFullJid());
 
 			String sig = account.getPgpSignature();
 			if (sig != null) {
@@ -1289,8 +1296,8 @@ public class XmppConnectionService extends Service {
 		account.pendingConferenceLeaves.remove(conversation);
 		if (account.getStatus() == Account.STATUS_ONLINE) {
 			PresencePacket packet = new PresencePacket();
-			packet.setAttribute("to", conversation.getMucOptions().getJoinJid());
-			packet.setAttribute("from", conversation.getAccount().getFullJid());
+			packet.setTo(conversation.getMucOptions().getJoinJid());
+			packet.setFrom(conversation.getAccount().getFullJid());
 			packet.setAttribute("type", "unavailable");
 			sendPresencePacket(conversation.getAccount(), packet);
 			conversation.getMucOptions().setOffline();
@@ -1307,20 +1314,19 @@ public class XmppConnectionService extends Service {
 				|| (account.getStatus() == Account.STATUS_DISABLED)) {
 			if (!force) {
 				List<Conversation> conversations = getConversations();
-				for (int i = 0; i < conversations.size(); i++) {
-					Conversation conversation = conversations.get(i);
-					if (conversation.getAccount() == account) {
-						if (conversation.getMode() == Conversation.MODE_MULTI) {
-							leaveMuc(conversation);
-						} else {
-							if (conversation.endOtrIfNeeded()) {
-								Log.d(Config.LOGTAG, account.getJid()
-										+ ": ended otr session with "
-										+ conversation.getContactJid());
-							}
-						}
-					}
-				}
+                for (Conversation conversation : conversations) {
+                    if (conversation.getAccount() == account) {
+                        if (conversation.getMode() == Conversation.MODE_MULTI) {
+                            leaveMuc(conversation);
+                        } else {
+                            if (conversation.endOtrIfNeeded()) {
+                                Log.d(Config.LOGTAG, account.getJid()
+                                        + ": ended otr session with "
+                                        + conversation.getContactJid());
+                            }
+                        }
+                    }
+                }
 			}
 			account.getXmppConnection().disconnect(force);
 		}
@@ -1365,24 +1371,23 @@ public class XmppConnectionService extends Service {
 				account.getJid() + " otr session established with "
 						+ conversation.getContactJid() + "/"
 						+ otrSession.getSessionID().getUserID());
-		for (int i = 0; i < messages.size(); ++i) {
-			Message msg = messages.get(i);
-			if ((msg.getStatus() == Message.STATUS_UNSEND || msg.getStatus() == Message.STATUS_WAITING)
-					&& (msg.getEncryption() == Message.ENCRYPTION_OTR)) {
-				msg.setPresence(otrSession.getSessionID().getUserID());
-				if (msg.getType() == Message.TYPE_TEXT) {
-					MessagePacket outPacket = mMessageGenerator
-							.generateOtrChat(msg, true);
-					if (outPacket != null) {
-						msg.setStatus(Message.STATUS_SEND);
-						databaseBackend.updateMessage(msg);
-						sendMessagePacket(account, outPacket);
-					}
-				} else if (msg.getType() == Message.TYPE_IMAGE) {
-					mJingleConnectionManager.createNewConnection(msg);
-				}
-			}
-		}
+        for (Message msg : messages) {
+            if ((msg.getStatus() == Message.STATUS_UNSEND || msg.getStatus() == Message.STATUS_WAITING)
+                    && (msg.getEncryption() == Message.ENCRYPTION_OTR)) {
+                msg.setPresence(otrSession.getSessionID().getUserID());
+                if (msg.getType() == Message.TYPE_TEXT) {
+                    MessagePacket outPacket = mMessageGenerator
+                            .generateOtrChat(msg, true);
+                    if (outPacket != null) {
+                        msg.setStatus(Message.STATUS_SEND);
+                        databaseBackend.updateMessage(msg);
+                        sendMessagePacket(account, outPacket);
+                    }
+                } else if (msg.getType() == Message.TYPE_IMAGE) {
+                    mJingleConnectionManager.createNewConnection(msg);
+                }
+            }
+        }
 		updateConversationUi();
 	}
 
@@ -1397,8 +1402,8 @@ public class XmppConnectionService extends Service {
 			packet.setFrom(account.getFullJid());
 			packet.addChild("private", "urn:xmpp:carbons:2");
 			packet.addChild("no-copy", "urn:xmpp:hints");
-			packet.setTo(otrSession.getSessionID().getAccountID() + "/"
-					+ otrSession.getSessionID().getUserID());
+			packet.setAttribute("to", otrSession.getSessionID().getAccountID() + "/"
+                    + otrSession.getSessionID().getUserID());
 			try {
 				packet.setBody(otrSession
 						.transformSending(CryptoHelper.FILETRANSFER
@@ -1596,7 +1601,7 @@ public class XmppConnectionService extends Service {
 		if (account.getStatus() == Account.STATUS_ONLINE) {
 			IqPacket iq = new IqPacket(IqPacket.TYPE_SET);
 			Element item = iq.query("jabber:iq:roster").addChild("item");
-			item.setAttribute("jid", contact.getJid());
+			item.setAttribute("jid", contact.getJid().toString());
 			item.setAttribute("subscription", "remove");
 			account.getXmppConnection().sendIqPacket(iq, null);
 		}
@@ -1648,8 +1653,8 @@ public class XmppConnectionService extends Service {
 		}
 	}
 
-	public boolean markMessage(Account account, String recipient, String uuid,
-			int status) {
+	public boolean markMessage(final Account account, final Jid recipient, final String uuid,
+			final int status) {
 		if (uuid == null) {
 			return false;
 		} else {
@@ -1730,7 +1735,7 @@ public class XmppConnectionService extends Service {
 		}
 	}
 
-	public Account findAccountByJid(String accountJid) {
+	public Account findAccountByJid(final Jid accountJid) {
 		for (Account account : this.accounts) {
 			if (account.getJid().equals(accountJid)) {
 				return account;
@@ -1756,7 +1761,7 @@ public class XmppConnectionService extends Service {
 			Log.d(Config.LOGTAG, conversation.getAccount().getJid()
 					+ ": sending read marker for " + conversation.getName());
 			Account account = conversation.getAccount();
-			String to = conversation.getContactJid();
+			final Jid to = conversation.getContactJid();
 			this.sendMessagePacket(conversation.getAccount(),
 					mMessageGenerator.confirm(account, to, id));
 		}
@@ -1810,14 +1815,14 @@ public class XmppConnectionService extends Service {
 	}
 
 	public List<String> getKnownHosts() {
-		List<String> hosts = new ArrayList<String>();
+		List<String> hosts = new ArrayList<>();
 		for (Account account : getAccounts()) {
-			if (!hosts.contains(account.getServer())) {
-				hosts.add(account.getServer());
+			if (!hosts.contains(account.getServer().toString())) {
+				hosts.add(account.getServer().toString());
 			}
 			for (Contact contact : account.getRoster().getContacts()) {
 				if (contact.showInRoster()) {
-					String server = contact.getServer();
+					final String server = contact.getServer().toString();
 					if (server != null && !hosts.contains(server)) {
 						hosts.add(server);
 					}
@@ -1828,7 +1833,7 @@ public class XmppConnectionService extends Service {
 	}
 
 	public List<String> getKnownConferenceHosts() {
-		ArrayList<String> mucServers = new ArrayList<String>();
+		ArrayList<String> mucServers = new ArrayList<>();
 		for (Account account : accounts) {
 			if (account.getXmppConnection() != null) {
 				String server = account.getXmppConnection().getMucServer();
@@ -1891,7 +1896,7 @@ public class XmppConnectionService extends Service {
 	}
 
 	public List<Contact> findContacts(String jid) {
-		ArrayList<Contact> contacts = new ArrayList<Contact>();
+		ArrayList<Contact> contacts = new ArrayList<>();
 		for (Account account : getAccounts()) {
 			if (!account.isOptionSet(Account.OPTION_DISABLED)) {
 				Contact contact = account.getRoster().getContactFromRoster(jid);
@@ -1931,7 +1936,7 @@ public class XmppConnectionService extends Service {
 	}
 
 	public void resendFailedMessages(Message message) {
-		List<Message> messages = new ArrayList<Message>();
+		List<Message> messages = new ArrayList<>();
 		Message current = message;
 		while(current.getStatus() == Message.STATUS_SEND_FAILED) {
 			messages.add(current);
diff --git a/src/main/java/eu/siacs/conversations/utils/DNSHelper.java b/src/main/java/eu/siacs/conversations/utils/DNSHelper.java
index f101e8833..8c1a8dea3 100644
--- a/src/main/java/eu/siacs/conversations/utils/DNSHelper.java
+++ b/src/main/java/eu/siacs/conversations/utils/DNSHelper.java
@@ -11,6 +11,7 @@ import de.measite.minidns.record.AAAA;
 import de.measite.minidns.record.Data;
 import de.measite.minidns.util.NameUtil;
 import eu.siacs.conversations.Config;
+import eu.siacs.conversations.xmpp.jid.Jid;
 
 import java.io.IOException;
 import java.net.InetAddress;
@@ -26,7 +27,8 @@ import android.util.Log;
 public class DNSHelper {
 	protected static Client client = new Client();
 
-	public static Bundle getSRVRecord(String host) throws IOException {
+	public static Bundle getSRVRecord(final Jid jid) throws IOException {
+        final String host = jid.getDomainpart();
 		String dns[] = client.findDNS();
 
 		if (dns != null) {
@@ -62,9 +64,9 @@ public class DNSHelper {
 			// a random order respecting the weight, and dump that priority by
 			// priority
 
-			TreeMap<Integer, ArrayList<SRV>> priorities = new TreeMap<Integer, ArrayList<SRV>>();
-			TreeMap<String, ArrayList<String>> ips4 = new TreeMap<String, ArrayList<String>>();
-			TreeMap<String, ArrayList<String>> ips6 = new TreeMap<String, ArrayList<String>>();
+			TreeMap<Integer, ArrayList<SRV>> priorities = new TreeMap<>();
+			TreeMap<String, ArrayList<String>> ips4 = new TreeMap<>();
+			TreeMap<String, ArrayList<String>> ips6 = new TreeMap<>();
 
 			for (Record[] rrset : new Record[][] { message.getAnswers(),
 					message.getAdditionalResourceRecords() }) {
@@ -97,7 +99,7 @@ public class DNSHelper {
 			}
 
 			Random rnd = new Random();
-			ArrayList<SRV> result = new ArrayList<SRV>(
+			ArrayList<SRV> result = new ArrayList<>(
 					priorities.size() * 2 + 1);
 			for (ArrayList<SRV> s : priorities.values()) {
 
@@ -136,7 +138,7 @@ public class DNSHelper {
 				bundle.putString("error", "nosrv");
 				return bundle;
 			}
-			ArrayList<Bundle> values = new ArrayList<Bundle>();
+			ArrayList<Bundle> values = new ArrayList<>();
 			for (SRV srv : result) {
 				Bundle namePort = new Bundle();
 				namePort.putString("name", srv.getName());
diff --git a/src/main/java/eu/siacs/conversations/xmpp/XmppConnection.java b/src/main/java/eu/siacs/conversations/xmpp/XmppConnection.java
index 2b9d6632d..9c1603846 100644
--- a/src/main/java/eu/siacs/conversations/xmpp/XmppConnection.java
+++ b/src/main/java/eu/siacs/conversations/xmpp/XmppConnection.java
@@ -48,6 +48,8 @@ import eu.siacs.conversations.xml.Element;
 import eu.siacs.conversations.xml.Tag;
 import eu.siacs.conversations.xml.TagWriter;
 import eu.siacs.conversations.xml.XmlReader;
+import eu.siacs.conversations.xmpp.jid.InvalidJidException;
+import eu.siacs.conversations.xmpp.jid.Jid;
 import eu.siacs.conversations.xmpp.jingle.OnJinglePacketReceived;
 import eu.siacs.conversations.xmpp.jingle.stanzas.JinglePacket;
 import eu.siacs.conversations.xmpp.stanzas.AbstractStanza;
@@ -76,10 +78,12 @@ public class XmppConnection implements Runnable {
 	private boolean shouldBind = true;
 	private boolean shouldAuthenticate = true;
 	private Element streamFeatures;
-	private HashMap<String, List<String>> disco = new HashMap<String, List<String>>();
+	private HashMap<String, List<String>> disco = new HashMap<>();
+
 	private String streamId = null;
 	private int smVersion = 3;
-	private SparseArray<String> messageReceipts = new SparseArray<String>();
+	private SparseArray<String> messageReceipts = new SparseArray<>();
+
 	private boolean usingCompression = false;
 	private boolean usingEncryption = false;
 	private int stanzasReceived = 0;
@@ -89,7 +93,7 @@ public class XmppConnection implements Runnable {
 	private long lastConnect = 0;
 	private long lastSessionStarted = 0;
 	private int attempt = 0;
-	private Hashtable<String, PacketReceived> packetCallbacks = new Hashtable<String, PacketReceived>();
+	private Hashtable<String, PacketReceived> packetCallbacks = new Hashtable<>();
 	private OnPresencePacketReceived presenceListener = null;
 	private OnJinglePacketReceived jingleListener = null;
 	private OnIqPacketReceived unregisteredIqListener = null;
@@ -102,7 +106,7 @@ public class XmppConnection implements Runnable {
 	public XmppConnection(Account account, XmppConnectionService service) {
 		this.account = account;
 		this.wakeLock = service.getPowerManager().newWakeLock(
-				PowerManager.PARTIAL_WAKE_LOCK, account.getJid());
+				PowerManager.PARTIAL_WAKE_LOCK, account.getJid().toString());
 		tagWriter = new TagWriter();
 		mXmppConnectionService = service;
 		applicationContext = service.getApplicationContext();
@@ -127,7 +131,7 @@ public class XmppConnection implements Runnable {
 	}
 
 	protected void connect() {
-		Log.d(Config.LOGTAG, account.getJid() + ": connecting");
+		Log.d(Config.LOGTAG, account.getJid().toString() + ": connecting");
 		usingCompression = false;
 		usingEncryption = false;
 		lastConnect = SystemClock.elapsedRealtime();
@@ -143,7 +147,7 @@ public class XmppConnection implements Runnable {
 			Bundle result = DNSHelper.getSRVRecord(account.getServer());
 			ArrayList<Parcelable> values = result.getParcelableArrayList("values");
 			if ("timeout".equals(result.getString("error"))) {
-				Log.d(Config.LOGTAG, account.getJid() + ": dns timeout");
+				Log.d(Config.LOGTAG, account.getJid().toString() + ": dns timeout");
 				this.changeStatus(Account.STATUS_OFFLINE);
 				return;
 			} else if (values != null) {
@@ -158,12 +162,12 @@ public class XmppConnection implements Runnable {
 						InetSocketAddress addr;
 						if (srvIpServer != null) {
 							addr = new InetSocketAddress(srvIpServer, srvRecordPort);
-							Log.d(Config.LOGTAG, account.getJid()
+							Log.d(Config.LOGTAG, account.getJid().toString()
 									+ ": using values from dns " + srvRecordServer
 									+ "[" + srvIpServer + "]:" + srvRecordPort);
 						} else {
 							addr = new InetSocketAddress(srvRecordServer, srvRecordPort);
-							Log.d(Config.LOGTAG, account.getJid()
+							Log.d(Config.LOGTAG, account.getJid().toString()
 									+ ": using values from dns "
 									+ srvRecordServer + ":" + srvRecordPort);
 						}
@@ -171,10 +175,10 @@ public class XmppConnection implements Runnable {
 						socket.connect(addr, 20000);
 						socketError = false;
 					} catch (UnknownHostException e) {
-						Log.d(Config.LOGTAG, account.getJid() + ": " + e.getMessage());
+						Log.d(Config.LOGTAG, account.getJid().toString() + ": " + e.getMessage());
 						i++;
 					} catch (IOException e) {
-						Log.d(Config.LOGTAG, account.getJid() + ": " + e.getMessage());
+						Log.d(Config.LOGTAG, account.getJid().toString() + ": " + e.getMessage());
 						i++;
 					}
 				}
@@ -183,16 +187,16 @@ public class XmppConnection implements Runnable {
 					if (wakeLock.isHeld()) {
 						try {
 							wakeLock.release();
-						} catch (RuntimeException re) {
+						} catch (final RuntimeException ignored) {
 						}
 					}
 					return;
 				}
 			} else if (result.containsKey("error")
 					&& "nosrv".equals(result.getString("error", null))) {
-				socket = new Socket(account.getServer(), 5222);
+				socket = new Socket(account.getServer().getDomainpart(), 5222);
 			} else {
-				Log.d(Config.LOGTAG, account.getJid()
+				Log.d(Config.LOGTAG, account.getJid().toString()
 						+ ": timeout in DNS resolution");
 				changeStatus(Account.STATUS_OFFLINE);
 				return;
@@ -222,51 +226,38 @@ public class XmppConnection implements Runnable {
 			if (wakeLock.isHeld()) {
 				try {
 					wakeLock.release();
-				} catch (RuntimeException re) {
+				} catch (final RuntimeException ignored) {
 				}
 			}
-			return;
-		} catch (IOException e) {
-			Log.d(Config.LOGTAG, account.getJid() + ": " + e.getMessage());
+        } catch (final IOException | XmlPullParserException e) {
+			Log.d(Config.LOGTAG, account.getJid().toString() + ": " + e.getMessage());
 			this.changeStatus(Account.STATUS_OFFLINE);
 			if (wakeLock.isHeld()) {
 				try {
 					wakeLock.release();
-				} catch (RuntimeException re) {
+				} catch (final RuntimeException ignored) {
 				}
 			}
-			return;
-		} catch (NoSuchAlgorithmException e) {
-			Log.d(Config.LOGTAG, account.getJid() + ": " + e.getMessage());
+        } catch (NoSuchAlgorithmException e) {
+			Log.d(Config.LOGTAG, account.getJid().toString() + ": " + e.getMessage());
 			this.changeStatus(Account.STATUS_OFFLINE);
 			Log.d(Config.LOGTAG, "compression exception " + e.getMessage());
 			if (wakeLock.isHeld()) {
 				try {
 					wakeLock.release();
-				} catch (RuntimeException re) {
-				}
-			}
-			return;
-		} catch (XmlPullParserException e) {
-			Log.d(Config.LOGTAG, account.getJid() + ": " + e.getMessage());
-			this.changeStatus(Account.STATUS_OFFLINE);
-			if (wakeLock.isHeld()) {
-				try {
-					wakeLock.release();
-				} catch (RuntimeException re) {
+				} catch (final RuntimeException ignored) {
 				}
 			}
-			return;
-		}
+        }
 
-	}
+    }
 
 	@Override
 	public void run() {
 		connect();
 	}
 
-	private void processStream(Tag currentTag) throws XmlPullParserException,
+	private void processStream(final Tag currentTag) throws XmlPullParserException,
 			IOException, NoSuchAlgorithmException {
 		Tag nextTag = tagReader.readTag();
 		while ((nextTag != null) && (!nextTag.isEnd("stream"))) {
@@ -279,7 +270,7 @@ public class XmppConnection implements Runnable {
 			} else if (nextTag.isStart("compressed")) {
 				switchOverToZLib(nextTag);
 			} else if (nextTag.isStart("success")) {
-				Log.d(Config.LOGTAG, account.getJid() + ": logged in");
+				Log.d(Config.LOGTAG, account.getJid().toString() + ": logged in");
 				tagReader.readTag();
 				tagReader.reset();
 				sendStartStream();
@@ -300,11 +291,11 @@ public class XmppConnection implements Runnable {
 				Element enabled = tagReader.readElement(nextTag);
 				if ("true".equals(enabled.getAttribute("resume"))) {
 					this.streamId = enabled.getAttribute("id");
-					Log.d(Config.LOGTAG, account.getJid()
+					Log.d(Config.LOGTAG, account.getJid().toString()
 							+ ": stream managment(" + smVersion
 							+ ") enabled (resumable)");
 				} else {
-					Log.d(Config.LOGTAG, account.getJid()
+					Log.d(Config.LOGTAG, account.getJid().toString()
 							+ ": stream managment(" + smVersion + ") enabled");
 				}
 				this.lastSessionStarted = SystemClock.elapsedRealtime();
@@ -318,11 +309,11 @@ public class XmppConnection implements Runnable {
 				try {
 					int serverCount = Integer.parseInt(h);
 					if (serverCount != stanzasSent) {
-						Log.d(Config.LOGTAG, account.getJid()
+						Log.d(Config.LOGTAG, account.getJid().toString()
 								+ ": session resumed with lost packages");
 						stanzasSent = serverCount;
 					} else {
-						Log.d(Config.LOGTAG, account.getJid()
+						Log.d(Config.LOGTAG, account.getJid().toString()
 								+ ": session resumed");
 					}
 					if (acknowledgedListener != null) {
@@ -334,7 +325,7 @@ public class XmppConnection implements Runnable {
 						}
 					}
 					messageReceipts.clear();
-				} catch (NumberFormatException e) {
+				} catch (final NumberFormatException ignored) {
 
 				}
 				sendInitialPing();
@@ -357,7 +348,7 @@ public class XmppConnection implements Runnable {
 				}
 			} else if (nextTag.isStart("failed")) {
 				tagReader.readElement(nextTag);
-				Log.d(Config.LOGTAG, account.getJid() + ": resumption failed");
+				Log.d(Config.LOGTAG, account.getJid().toString() + ": resumption failed");
 				streamId = null;
 				if (account.getStatus() != Account.STATUS_ONLINE) {
 					sendBindRequest();
@@ -380,7 +371,7 @@ public class XmppConnection implements Runnable {
 	}
 
 	private void sendInitialPing() {
-		Log.d(Config.LOGTAG, account.getJid() + ": sending intial ping");
+		Log.d(Config.LOGTAG, account.getJid().toString() + ": sending intial ping");
 		IqPacket iq = new IqPacket(IqPacket.TYPE_GET);
 		iq.setFrom(account.getFullJid());
 		iq.addChild("ping", "urn:xmpp:ping");
@@ -388,7 +379,7 @@ public class XmppConnection implements Runnable {
 
 			@Override
 			public void onIqPacketReceived(Account account, IqPacket packet) {
-				Log.d(Config.LOGTAG, account.getJid()
+				Log.d(Config.LOGTAG, account.getJid().toString()
 						+ ": online with resource " + account.getResource());
 				changeStatus(Account.STATUS_ONLINE);
 			}
@@ -507,7 +498,7 @@ public class XmppConnection implements Runnable {
 		tagWriter.writeElement(compress);
 	}
 
-	private void switchOverToZLib(Tag currentTag)
+	private void switchOverToZLib(final Tag currentTag)
 			throws XmlPullParserException, IOException,
 			NoSuchAlgorithmException {
 		tagReader.readTag(); // read tag close
@@ -537,7 +528,7 @@ public class XmppConnection implements Runnable {
 		return getPreferences().getBoolean("enable_legacy_ssl", false);
 	}
 
-	private void switchOverToTls(Tag currentTag) throws XmlPullParserException,
+	private void switchOverToTls(final Tag currentTag) throws XmlPullParserException,
 			IOException {
 		tagReader.readTag();
 		try {
@@ -551,24 +542,23 @@ public class XmppConnection implements Runnable {
 				throw new IOException("SSLSocketFactory was null");
 			}
 
-			HostnameVerifier verifier = this.mXmppConnectionService.getMemorizingTrustManager().wrapHostnameVerifier(new StrictHostnameVerifier());
+			final HostnameVerifier verifier = this.mXmppConnectionService.getMemorizingTrustManager().wrapHostnameVerifier(new StrictHostnameVerifier());
 
 			if (socket == null) {
 				throw new IOException("socket was null");
 			}
-			SSLSocket sslSocket = (SSLSocket) factory.createSocket(socket,
+			final SSLSocket sslSocket = (SSLSocket) factory.createSocket(socket,
 					socket.getInetAddress().getHostAddress(), socket.getPort(),
 					true);
 
 			// Support all protocols except legacy SSL.
 			// The min SDK version prevents us having to worry about SSLv2. In
-			// future, this may be
-			// true of SSLv3 as well.
+			// future, this may be true of SSLv3 as well.
 			final String[] supportProtocols;
 			if (enableLegacySSL()) {
 				supportProtocols = sslSocket.getSupportedProtocols();
 			} else {
-				final List<String> supportedProtocols = new LinkedList<String>(
+				final List<String> supportedProtocols = new LinkedList<>(
 						Arrays.asList(sslSocket.getSupportedProtocols()));
 				supportedProtocols.remove("SSLv3");
 				supportProtocols = new String[supportedProtocols.size()];
@@ -577,7 +567,7 @@ public class XmppConnection implements Runnable {
 			sslSocket.setEnabledProtocols(supportProtocols);
 
 			if (verifier != null
-					&& !verifier.verify(account.getServer(),
+					&& !verifier.verify(account.getServer().getDomainpart(),
 					sslSocket.getSession())) {
 				sslSocket.close();
 				throw new IOException("host mismatch in TLS connection");
@@ -590,12 +580,10 @@ public class XmppConnection implements Runnable {
 			usingEncryption = true;
 			processStream(tagReader.readTag());
 			sslSocket.close();
-		} catch (NoSuchAlgorithmException e1) {
+		} catch (final NoSuchAlgorithmException | KeyManagementException e1) {
 			e1.printStackTrace();
-		} catch (KeyManagementException e) {
-			e.printStackTrace();
 		}
-	}
+    }
 
 	private void sendSaslAuthPlain() throws IOException {
 		String saslString = CryptoHelper.saslPlain(account.getUsername(),
@@ -676,7 +664,7 @@ public class XmppConnection implements Runnable {
 	}
 
 	private List<String> extractMechanisms(Element stream) {
-		ArrayList<String> mechanisms = new ArrayList<String>(stream
+		ArrayList<String> mechanisms = new ArrayList<>(stream
 				.getChildren().size());
 		for (Element child : stream.getChildren()) {
 			mechanisms.add(child.getContent());
@@ -742,10 +730,14 @@ public class XmppConnection implements Runnable {
 			public void onIqPacketReceived(Account account, IqPacket packet) {
 				Element bind = packet.findChild("bind");
 				if (bind != null) {
-					Element jid = bind.findChild("jid");
+					final Element jid = bind.findChild("jid");
 					if (jid != null && jid.getContent() != null) {
-						account.setResource(jid.getContent().split("/", 2)[1]);
-						if (streamFeatures.hasChild("sm", "urn:xmpp:sm:3")) {
+                        try {
+                            account.setResource(Jid.fromString(jid.getContent()).getResourcepart());
+                        } catch (final InvalidJidException e) {
+                            // TODO: Handle the case where an external JID is technically invalid?
+                        }
+                        if (streamFeatures.hasChild("sm", "urn:xmpp:sm:3")) {
 							smVersion = 3;
 							EnablePacket enable = new EnablePacket(smVersion);
 							tagWriter.writeStanzaAsync(enable);
@@ -783,24 +775,24 @@ public class XmppConnection implements Runnable {
 		}
 	}
 
-	private void sendServiceDiscoveryInfo(final String server) {
-		IqPacket iq = new IqPacket(IqPacket.TYPE_GET);
-		iq.setTo(server);
+	private void sendServiceDiscoveryInfo(final Jid server) {
+		final IqPacket iq = new IqPacket(IqPacket.TYPE_GET);
+		iq.setTo(server.toDomainJid());
 		iq.query("http://jabber.org/protocol/disco#info");
 		this.sendIqPacket(iq, new OnIqPacketReceived() {
 
 			@Override
 			public void onIqPacketReceived(Account account, IqPacket packet) {
-				List<Element> elements = packet.query().getChildren();
-				List<String> features = new ArrayList<String>();
-				for (int i = 0; i < elements.size(); ++i) {
-					if (elements.get(i).getName().equals("feature")) {
-						features.add(elements.get(i).getAttribute("var"));
-					}
-				}
-				disco.put(server, features);
-
-				if (account.getServer().equals(server)) {
+				final List<Element> elements = packet.query().getChildren();
+				final List<String> features = new ArrayList<>();
+                for (Element element : elements) {
+                    if (element.getName().equals("feature")) {
+                        features.add(element.getAttribute("var"));
+                    }
+                }
+				disco.put(server.toDomainJid().toString(), features);
+
+				if (account.getServer().equals(server.toDomainJid())) {
 					enableAdvancedStreamFeatures();
 				}
 			}
@@ -813,21 +805,25 @@ public class XmppConnection implements Runnable {
 		}
 	}
 
-	private void sendServiceDiscoveryItems(final String server) {
-		IqPacket iq = new IqPacket(IqPacket.TYPE_GET);
-		iq.setTo(server);
+	private void sendServiceDiscoveryItems(final Jid server) {
+		final IqPacket iq = new IqPacket(IqPacket.TYPE_GET);
+		iq.setTo(server.toDomainJid());
 		iq.query("http://jabber.org/protocol/disco#items");
 		this.sendIqPacket(iq, new OnIqPacketReceived() {
 
 			@Override
 			public void onIqPacketReceived(Account account, IqPacket packet) {
 				List<Element> elements = packet.query().getChildren();
-				for (int i = 0; i < elements.size(); ++i) {
-					if (elements.get(i).getName().equals("item")) {
-						String jid = elements.get(i).getAttribute("jid");
-						sendServiceDiscoveryInfo(jid);
-					}
-				}
+                for (Element element : elements) {
+                    if (element.getName().equals("item")) {
+                        final String jid = element.getAttribute("jid");
+                        try {
+                            sendServiceDiscoveryInfo(Jid.fromString(jid).toDomainJid());
+                        } catch (final InvalidJidException ignored) {
+                            // TODO: Handle the case where an external JID is technically invalid?
+                        }
+                    }
+                }
 			}
 		});
 	}
@@ -854,9 +850,13 @@ public class XmppConnection implements Runnable {
 			throws XmlPullParserException, IOException {
 		Element streamError = tagReader.readElement(currentTag);
 		if (streamError != null && streamError.hasChild("conflict")) {
-			String resource = account.getResource().split("\\.")[0];
-			account.setResource(resource + "." + nextRandomId());
-			Log.d(Config.LOGTAG,
+			final String resource = account.getResource().split("\\.")[0];
+            try {
+                account.setResource(resource + "." + nextRandomId());
+            } catch (final InvalidJidException ignored) {
+                // Should never reach here.
+            }
+            Log.d(Config.LOGTAG,
 					account.getJid() + ": switching resource due to conflict ("
 							+ account.getResource() + ")");
 		}
@@ -864,8 +864,8 @@ public class XmppConnection implements Runnable {
 
 	private void sendStartStream() throws IOException {
 		Tag stream = Tag.start("stream:stream");
-		stream.setAttribute("from", account.getJid());
-		stream.setAttribute("to", account.getServer());
+		stream.setAttribute("from", account.getJid().toString());
+		stream.setAttribute("to", account.getServer().toString());
 		stream.setAttribute("version", "1.0");
 		stream.setAttribute("xml:lang", "en");
 		stream.setAttribute("xmlns", "jabber:client");
@@ -1003,7 +1003,7 @@ public class XmppConnection implements Runnable {
 	}
 
 	public List<String> findDiscoItemsByFeature(String feature) {
-		List<String> items = new ArrayList<String>();
+		final List<String> items = new ArrayList<>();
 		for (Entry<String, List<String>> cursor : disco.entrySet()) {
 			if (cursor.getValue().contains(feature)) {
 				items.add(cursor.getKey());
@@ -1079,12 +1079,10 @@ public class XmppConnection implements Runnable {
 			this.connection = connection;
 		}
 
-		private boolean hasDiscoFeature(String server, String feature) {
-			if (!connection.disco.containsKey(server)) {
-				return false;
-			}
-			return connection.disco.get(server).contains(feature);
-		}
+		private boolean hasDiscoFeature(final Jid server, final String feature) {
+            return connection.disco.containsKey(server.toDomainJid().toString()) &&
+                    connection.disco.get(server.toDomainJid().toString()).contains(feature);
+        }
 
 		public boolean carbons() {
 			return hasDiscoFeature(account.getServer(), "urn:xmpp:carbons:2");
@@ -1095,12 +1093,7 @@ public class XmppConnection implements Runnable {
 		}
 
 		public boolean csi() {
-			if (connection.streamFeatures == null) {
-				return false;
-			} else {
-				return connection.streamFeatures.hasChild("csi",
-						"urn:xmpp:csi:0");
-			}
+            return connection.streamFeatures != null && connection.streamFeatures.hasChild("csi", "urn:xmpp:csi:0");
 		}
 
 		public boolean pubsub() {
@@ -1113,11 +1106,7 @@ public class XmppConnection implements Runnable {
 		}
 
 		public boolean rosterVersioning() {
-			if (connection.streamFeatures == null) {
-				return false;
-			} else {
-				return connection.streamFeatures.hasChild("ver");
-			}
+            return connection.streamFeatures != null && connection.streamFeatures.hasChild("ver");
 		}
 
 		public boolean streamhost() {
diff --git a/src/main/java/eu/siacs/conversations/xmpp/jid/Jid.java b/src/main/java/eu/siacs/conversations/xmpp/jid/Jid.java
index 7d8f702f0..2bbde7aba 100644
--- a/src/main/java/eu/siacs/conversations/xmpp/jid/Jid.java
+++ b/src/main/java/eu/siacs/conversations/xmpp/jid/Jid.java
@@ -19,7 +19,7 @@ public final class Jid {
     private final String displayjid;
 
     public String getLocalpart() {
-        return IDN.toUnicode(localpart);
+        return localpart;
     }
 
     public String getDomainpart() {
@@ -27,10 +27,10 @@ public final class Jid {
     }
 
     public String getResourcepart() {
-        return IDN.toUnicode(resourcepart);
+        return resourcepart;
     }
 
-    public Jid fromString(final String jid) throws InvalidJidException {
+    public static Jid fromString(final String jid) throws InvalidJidException {
         return new Jid(jid);
     }
 
@@ -121,11 +121,20 @@ public final class Jid {
         this.displayjid = finaljid;
     }
 
-    public Jid getBareJid() {
+    public Jid toBareJid() {
         try {
             return resourcepart.isEmpty() ? this : fromParts(localpart, domainpart, "");
         } catch (final InvalidJidException e) {
-            // This should never happen due to the contracts we have in place.
+            // This should never happen.
+            return null;
+        }
+    }
+
+    public Jid toDomainJid() {
+        try {
+            return resourcepart.isEmpty() && localpart.isEmpty() ? this : fromString(getDomainpart());
+        } catch (final InvalidJidException e) {
+            // This should never happen.
             return null;
         }
     }
diff --git a/src/main/java/eu/siacs/conversations/xmpp/pep/Avatar.java b/src/main/java/eu/siacs/conversations/xmpp/pep/Avatar.java
index 154fadf65..9f5ac988b 100644
--- a/src/main/java/eu/siacs/conversations/xmpp/pep/Avatar.java
+++ b/src/main/java/eu/siacs/conversations/xmpp/pep/Avatar.java
@@ -1,6 +1,8 @@
 package eu.siacs.conversations.xmpp.pep;
 
 import eu.siacs.conversations.xml.Element;
+import eu.siacs.conversations.xmpp.jid.Jid;
+
 import android.util.Base64;
 
 public class Avatar {
@@ -10,7 +12,7 @@ public class Avatar {
 	public int height;
 	public int width;
 	public long size;
-	public String owner;
+	public Jid owner;
 
 	public byte[] getImageAsBytes() {
 		return Base64.decode(image, Base64.DEFAULT);
diff --git a/src/main/java/eu/siacs/conversations/xmpp/stanzas/AbstractStanza.java b/src/main/java/eu/siacs/conversations/xmpp/stanzas/AbstractStanza.java
index eef41c791..ea8f64a9e 100644
--- a/src/main/java/eu/siacs/conversations/xmpp/stanzas/AbstractStanza.java
+++ b/src/main/java/eu/siacs/conversations/xmpp/stanzas/AbstractStanza.java
@@ -1,6 +1,7 @@
 package eu.siacs.conversations.xmpp.stanzas;
 
 import eu.siacs.conversations.xml.Element;
+import eu.siacs.conversations.xmpp.jid.Jid;
 
 public class AbstractStanza extends Element {
 
@@ -20,15 +21,15 @@ public class AbstractStanza extends Element {
 		return this.getAttribute("id");
 	}
 
-	public void setTo(String to) {
-		setAttribute("to", to);
+	public void setTo(final Jid to) {
+		setAttribute("to", to.toString());
 	}
 
-	public void setFrom(String from) {
-		setAttribute("from", from);
+	public void setFrom(final Jid from) {
+		setAttribute("from", from.toString());
 	}
 
-	public void setId(String id) {
+	public void setId(final String id) {
 		setAttribute("id", id);
 	}
 }