SPARK-626 Jars missing from the classpath in Linux

git-svn-id: http://svn.igniterealtime.org/svn/repos/spark/trunk@7991 b35dd754-fafc-0310-a699-88a17e54d16e

src/java/org/jivesoftware/MainWindow.java

@@ -239,6 +239,14 @@ public final class MainWindow extends ChatFrame implements ActionListener {
      * setting the Agent to be offline.
      */
     public void shutdown() {
+        final XMPPConnection con = SparkManager.getConnection();
+
+        if (con.isConnected()) {
+            // Send disconnect.
+            con.disconnect();
+        }
+
+
         // Notify all MainWindowListeners
         try {
             fireWindowShutdown();