synchronize modifications of output stream in tag writer

1 files changed, 4 insertions, 4 deletions

diff --git a/src/main/java/de/pixart/messenger/xml/TagWriter.java b/src/main/java/de/pixart/messenger/xml/TagWriter.java
index 699e527fa..7c25fdf4a 100644
--- a/src/main/java/de/pixart/messenger/xml/TagWriter.java
+++ b/src/main/java/de/pixart/messenger/xml/TagWriter.java
@@ -38,7 +38,7 @@ public class TagWriter {
     public TagWriter() {
     }
 
-    public void setOutputStream(OutputStream out) throws IOException {
+    public synchronized void setOutputStream(OutputStream out) throws IOException {
         if (out == null) {
             throw new IOException();
         }
@@ -54,7 +54,7 @@ public class TagWriter {
         return this;
     }
 
-    public TagWriter writeTag(Tag tag) throws IOException {
+    public synchronized  TagWriter writeTag(Tag tag) throws IOException {
         if (outputStream == null) {
             throw new IOException("output stream was null");
         }
@@ -63,7 +63,7 @@ public class TagWriter {
         return this;
     }
 
-    public TagWriter writeElement(Element element) throws IOException {
+    public synchronized TagWriter writeElement(Element element) throws IOException {
         if (outputStream == null) {
             throw new IOException("output stream was null");
         }
@@ -101,7 +101,7 @@ public class TagWriter {
         return outputStream != null;
     }
 
-    public void forceClose() {
+    public synchronized void forceClose() {
         finish();
         if (outputStream != null) {
             try {