unhandled exception when disconnected - Bug fixed.

src/net/java/sip/communicator/impl/gui/main/contactlist/ContactListPanel.java

@@ -28,7 +28,9 @@
 import javax.swing.JEditorPane;
 import javax.swing.JFrame;
 import javax.swing.JLabel;
+import javax.swing.JOptionPane;
 import javax.swing.JPanel;
+import javax.swing.JScrollBar;
 import javax.swing.JScrollPane;
 import javax.swing.KeyStroke;
 import javax.swing.SwingUtilities;
@@ -80,7 +82,7 @@ public ContactListPanel(MainFrame mainFrame) {
 		this.treePanel.setBackground(Color.WHITE);
         
         this.setHorizontalScrollBarPolicy
-            (JScrollPane.HORIZONTAL_SCROLLBAR_NEVER);
+            (JScrollPane.HORIZONTAL_SCROLLBAR_NEVER);	
 	}
 
      public void initTree(MetaContactListService contactListService) {
@@ -498,7 +500,12 @@ public void messageDelivered(MessageDeliveredEvent evt) {
      * Shows message to the user when message delivery failed.
      */
     public void messageDeliveryFailed(MessageDeliveryFailedEvent evt) {
-        //TODO: Show message to the user when message delivery failed.
+    	String msg = Messages.getString("msgNotDelivered", 
+    					evt.getDestinationContact().getDisplayName());
+    	String title = Messages.getString("msgDeliveryFailure");
+    	
+        JOptionPane.showMessageDialog(this, msg, title, 
+        		JOptionPane.WARNING_MESSAGE);
     }
 
     /**

src/net/java/sip/communicator/impl/gui/main/i18n/Messages.java

@@ -28,4 +28,16 @@ public static String getString(String key) {
 			return '!' + key + '!';
 		}
 	}
+	
+	public static String getString(String key, String param) {		
+		try {
+			String sourceString = RESOURCE_BUNDLE.getString(key);
+			
+			return sourceString.replaceAll("?", param);
+			
+		} catch (MissingResourceException e) {
+			
+			return '!' + key + '!';
+		}
+	}
 }

src/net/java/sip/communicator/impl/gui/main/i18n/messages.properties

@@ -37,6 +37,9 @@ last=Last
 launchOnStartUp=Launch on start up
 login=Login
 moveToGroup=Move to group
+msgDeliveryFailure=Message delivery failure
+msgNotDelivered=Message to ? could not be delivered due to a network problem.
+msgSendConnectionProblem=You are currently offline. Check your network connection. 
 networkFailure=Network failure
 next=Next
 no=No

src/net/java/sip/communicator/impl/gui/main/message/ChatSendPanel.java

@@ -20,6 +20,7 @@
 import javax.swing.JButton;
 import javax.swing.JEditorPane;
 import javax.swing.JLabel;
+import javax.swing.JOptionPane;
 import javax.swing.JPanel;
 
 import net.java.sip.communicator.impl.gui.main.customcontrols.AntialiasedPanel;
@@ -90,8 +91,18 @@ public void actionPerformed(ActionEvent e) {
             		.getMainFrame().getWaitToBeDeliveredMsgs()
             			.put(msg.getMessageUID(), this.chatPanel);
             
-            im.sendInstantMessage(chatPanel.getDefaultContact()
-            		.getDefaultContact(), msg);
+            try{
+            	im.sendInstantMessage(chatPanel.getDefaultContact()
+                		.getDefaultContact(), msg);
+            }
+            catch(IllegalStateException ex){
+            	String errorMsg = Messages.getString("msgSendConnectionProblem");
+            	
+            	String title = Messages.getString("msgDeliveryFailure");
+            	
+                JOptionPane.showMessageDialog(this, errorMsg, title, 
+                		JOptionPane.WARNING_MESSAGE);
+            }
 		}
 	}