Add check to avoid ArrayOutofBound

git-svn-id: http://svn.us.apache.org/repos/asf/tuscany@683776 13f79535-47bb-0310-9956-ffa450edef68

1 files changed, 4 insertions, 3 deletions

diff --git a/java/sca/modules/monitor-logging/src/main/java/org/apache/tuscany/sca/monitor/logging/impl/DefaultLoggingMonitorImpl.java b/java/sca/modules/monitor-logging/src/main/java/org/apache/tuscany/sca/monitor/logging/impl/DefaultLoggingMonitorImpl.java
index d4dc3d2be4..8a9701b8fc 100644
--- a/java/sca/modules/monitor-logging/src/main/java/org/apache/tuscany/sca/monitor/logging/impl/DefaultLoggingMonitorImpl.java
+++ b/java/sca/modules/monitor-logging/src/main/java/org/apache/tuscany/sca/monitor/logging/impl/DefaultLoggingMonitorImpl.java
@@ -20,9 +20,7 @@
 package org.apache.tuscany.sca.monitor.logging.impl;
 
 import java.util.ArrayList;
-import java.util.HashMap;
 import java.util.List;
-import java.util.Map;
 import java.util.logging.Level;
 import java.util.logging.Logger;
 
@@ -77,7 +75,10 @@ public class DefaultLoggingMonitorImpl implements Monitor {
         return problemCache;
     }
     
-    public Problem getLastLoggedProblem(){
+    public Problem getLastLoggedProblem() {
+        if (problemCache.isEmpty()) {
+            return null;
+        }
         return problemCache.get(problemCache.size() - 1);
     }