Exception in connecting Xmpp chat app with server - connection

Question

my code is
try {
ConnectionConfiguration connConfig = new ConnectionConfiguration(hostname, portno, "");
conn = new XMPPConnection(connConfig);
conn.connect();
}
catch (XMPPException e)
{
throw new ProtocolException(e.toString());
}
How to resolve this problem?
07-23 11:54:08.126: W/dalvikvm(19805): VFY: unable to resolve static
method 3144: Ljavax/swing/SwingUtilities;.invokeLater
(Ljava/lang/Runnable;)V 07-23 11:54:08.126: D/dalvikvm(19805): VFY:
replacing opcode 0x71 at 0x0006 07-23 11:54:08.126: D/dalvikvm(19805):
VFY: dead code 0x0009-0009 in
Lorg/jivesoftware/smackx/debugger/EnhancedDebugger;.userHasLogged
(Ljava/lang/String;)V 07-23 11:54:09.507: W/System.err(19805):
java.lang.reflect.InvocationTargetException 07-23 11:54:09.517:
W/System.err(19805): at
java.lang.reflect.Constructor.constructNative(Native Method) 07-23
11:54:09.517: W/System.err(19805): at
java.lang.reflect.Constructor.newInstance(Constructor.java:415) 07-23
11:54:09.527: W/System.err(19805): at
org.jivesoftware.smack.XMPPConnection.initReaderAndWriter(XMPPConnection.java:1027)
07-23 11:54:09.527: W/System.err(19805): at
org.jivesoftware.smack.XMPPConnection.initConnection(XMPPConnection.java:850)
07-23 11:54:09.547: W/System.err(19805): at
org.jivesoftware.smack.XMPPConnection.connectUsingConfiguration(XMPPConnection.java:834)
07-23 11:54:09.577: W/System.err(19805): at
org.jivesoftware.smack.XMPPConnection.connect(XMPPConnection.java:1276)
07-23 11:54:09.607: W/System.err(19805): at
com.src.protocol.XMPPProtocolManager.connect(XMPPProtocolManager.java:116)
07-23 11:54:09.607: W/System.err(19805): at
com.src.screen.Login.onClick(Login.java:80) 07-23 11:54:09.607:
W/System.err(19805): at
android.view.View.performClick(View.java:2532) 07-23 11:54:09.607:
W/System.err(19805): at
android.view.View$PerformClick.run(View.java:9293) 07-23 11:54:09.617:
W/System.err(19805): at
android.os.Handler.handleCallback(Handler.java:587) 07-23
11:54:09.617: W/System.err(19805): at
android.os.Handler.dispatchMessage(Handler.java:92) 07-23
11:54:09.627: W/System.err(19805): at
android.os.Looper.loop(Looper.java:150) 07-23 11:54:09.627:
W/System.err(19805): at
android.app.ActivityThread.main(ActivityThread.java:4310) 07-23
11:54:09.637: W/System.err(19805): at
java.lang.reflect.Method.invokeNative(Native Method) 07-23
11:54:09.637: W/System.err(19805): at
java.lang.reflect.Method.invoke(Method.java:507) 07-23 11:54:09.647:
W/System.err(19805): at
com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:839)
07-23 11:54:09.647: W/System.err(19805): at
com.android.internal.os.ZygoteInit.main(ZygoteInit.java:597) 07-23
11:54:09.657: W/System.err(19805): at
dalvik.system.NativeStart.main(Native Method) 07-23 11:54:09.657:
W/System.err(19805): Caused by: java.lang.NoClassDefFoundError:
javax.swing.JTabbedPane 07-23 11:54:09.667: W/System.err(19805): at
org.jivesoftware.smackx.debugger.EnhancedDebugger.createDebug(EnhancedDebugger.java:158)
07-23 11:54:09.667: W/System.err(19805): at
org.jivesoftware.smackx.debugger.EnhancedDebugger.(EnhancedDebugger.java:147)
07-23 11:54:09.667: W/System.err(19805): ... 19 more 07-23
11:54:09.677: E/[Login.java] : onConnection :(19805):
java.lang.NullPointerException 07-23 11:54:12.190: E/[Login.java] :
login :(19805): java.lang.IllegalStateException: Not connected to
server.

Answer 1

The exception is thrown if
InvocationTargetException - if the underlying method throws an exception.
So if the method, that has been invoked with reflection API, throws an exception (runtime exception for example), the reflection API will wrap the exception into an InvocationTargetException.