Hello,

In the previous topic I had problems with a client/server deployment (thanks jaikiran, at last I did the deployment) but when i'm executing the application, I have a exception.

I verify that the problem is the server return because if the return value is an Integer (for example) there are any problem but I tried to return Objects or Objects List and then I recived a Null Pointer Error and I don't know the reason.

The stack trace is the next one:

java.lang.reflect.UndeclaredThrowableException
 at $Proxy0.conectar(Unknown Source)
 at com.gui.funcionalidad.seguridad.controladorPUsuarios.conectar(controladorPUsuarios.java:143)
 at com.gui.pantalla.seguridad.LOGIN.btAceptarActionPerformed(LOGIN.java:119)
 at com.gui.pantalla.seguridad.LOGIN.access$000(LOGIN.java:18)
 at com.gui.pantalla.seguridad.LOGIN$1.actionPerformed(LOGIN.java:53)
 at javax.swing.AbstractButton.fireActionPerformed(Unknown Source)
 at javax.swing.AbstractButton$Handler.actionPerformed(Unknown Source)
 at javax.swing.DefaultButtonModel.fireActionPerformed(Unknown Source)
 at javax.swing.DefaultButtonModel.setPressed(Unknown Source)
 at javax.swing.plaf.basic.BasicButtonListener.mouseReleased(Unknown Source)
 at java.awt.Component.processMouseEvent(Unknown Source)
 at javax.swing.JComponent.processMouseEvent(Unknown Source)
 at java.awt.Component.processEvent(Unknown Source)
 at java.awt.Container.processEvent(Unknown Source)
 at java.awt.Component.dispatchEventImpl(Unknown Source)
 at java.awt.Container.dispatchEventImpl(Unknown Source)
 at java.awt.Component.dispatchEvent(Unknown Source)
 at java.awt.LightweightDispatcher.retargetMouseEvent(Unknown Source)
 at java.awt.LightweightDispatcher.processMouseEvent(Unknown Source)
 at java.awt.LightweightDispatcher.dispatchEvent(Unknown Source)
 at java.awt.Container.dispatchEventImpl(Unknown Source)
 at java.awt.Window.dispatchEventImpl(Unknown Source)
 at java.awt.Component.dispatchEvent(Unknown Source)
 at java.awt.EventQueue.dispatchEvent(Unknown Source)
 at java.awt.EventDispatchThread.pumpOneEventForFilters(Unknown Source)
 at java.awt.EventDispatchThread.pumpEventsForFilter(Unknown Source)
 at java.awt.EventDispatchThread.pumpEventsForHierarchy(Unknown Source)
 at java.awt.EventDispatchThread.pumpEvents(Unknown Source)
 at java.awt.EventDispatchThread.pumpEvents(Unknown Source)
 at java.awt.EventDispatchThread.run(Unknown Source)
Caused by: java.lang.ClassNotFoundException: org.hibernate.collection.Persistent
Bag
 at java.net.URLClassLoader$1.run(Unknown Source)
 at java.security.AccessController.doPrivileged(Native Method)
 at java.net.URLClassLoader.findClass(Unknown Source)
 at java.lang.ClassLoader.loadClass(Unknown Source)
 at sun.misc.Launcher$AppClassLoader.loadClass(Unknown Source)
 at java.lang.ClassLoader.loadClass(Unknown Source)
 at org.jboss.remoting.loading.RemotingClassLoader.loadClass(RemotingClas
sLoader.java:50)
 at org.jboss.remoting.loading.ObjectInputStreamWithClassLoader.resolveCl
ass(ObjectInputStreamWithClassLoader.java:139)
 at java.io.ObjectInputStream.readNonProxyDesc(Unknown Source)
 at java.io.ObjectInputStream.readClassDesc(Unknown Source)
 at java.io.ObjectInputStream.readOrdinaryObject(Unknown Source)
 at java.io.ObjectInputStream.readObject0(Unknown Source)
 at java.io.ObjectInputStream.defaultReadFields(Unknown Source)
 at java.io.ObjectInputStream.readSerialData(Unknown Source)
 at java.io.ObjectInputStream.readOrdinaryObject(Unknown Source)
 at java.io.ObjectInputStream.readObject0(Unknown Source)
 at java.io.ObjectInputStream.readObject(Unknown Source)
 at org.jboss.aop.joinpoint.InvocationResponse.readExternal(InvocationRes
ponse.java:122)
 at java.io.ObjectInputStream.readExternalData(Unknown Source)
 at java.io.ObjectInputStream.readOrdinaryObject(Unknown Source)
 at java.io.ObjectInputStream.readObject0(Unknown Source)
 at java.io.ObjectInputStream.defaultReadFields(Unknown Source)
 at java.io.ObjectInputStream.readSerialData(Unknown Source)
 at java.io.ObjectInputStream.readOrdinaryObject(Unknown Source)
 at java.io.ObjectInputStream.readObject0(Unknown Source)
 at java.io.ObjectInputStream.readObject(Unknown Source)
 at org.jboss.remoting.serialization.impl.java.JavaSerializationManager.r
eceiveObject(JavaSerializationManager.java:128)
 at org.jboss.remoting.marshal.serializable.SerializableUnMarshaller.read
(SerializableUnMarshaller.java:66)
 at org.jboss.remoting.transport.socket.SocketClientInvoker.transport(Soc
ketClientInvoker.java:279)
 at org.jboss.remoting.RemoteClientInvoker.invoke(RemoteClientInvoker.jav
a:143)
 at org.jboss.remoting.Client.invoke(Client.java:525)
 at org.jboss.remoting.Client.invoke(Client.java:488)
 at org.jboss.aspects.remoting.InvokeRemoteInterceptor.invoke(InvokeRemot
eInterceptor.java:55)
 at org.jboss.aop.joinpoint.MethodInvocation.invokeNext(MethodInvocation.
java:101)
 at org.jboss.aspects.tx.ClientTxPropagationInterceptor.invoke(ClientTxPr
opagationInterceptor.java:61)
 at org.jboss.aop.joinpoint.MethodInvocation.invokeNext(MethodInvocation.
java:101)
 at org.jboss.aspects.security.SecurityClientInterceptor.invoke(SecurityC
lientInterceptor.java:55)
 at org.jboss.aop.joinpoint.MethodInvocation.invokeNext(MethodInvocation.
java:101)
 at org.jboss.ejb3.remoting.IsLocalInterceptor.invoke(IsLocalInterceptor.
java:78)
 at org.jboss.aop.joinpoint.MethodInvocation.invokeNext(MethodInvocation.
java:101)
 at org.jboss.ejb3.stateless.StatelessRemoteProxy.invoke(StatelessRemoteP
roxy.java:102)
 ... 30 more