Error: Uncaught exception escaped

[compi]

Hello Community,

I'm actually programming an Project that use Hibernate to manage the
data and GWT for the Frontend.

I get an Problem when i'm trying call an Method of an RPC.

Here is the Log:

21:52:12.029 [ERROR] [gui] Uncaught exception escaped
java.lang.NullPointerException: null
at ourProject.client.common.LoginUI$2.onClick(LoginUI.java:96)
at com.google.gwt.event.dom.client.ClickEvent.dispatch(ClickEvent.java:
54)
at com.google.gwt.event.dom.client.ClickEvent.dispatch(ClickEvent.java:
1)
at com.google.gwt.event.shared.HandlerManager
$HandlerRegistry.fireEvent(HandlerManager.java:65)
at com.google.gwt.event.shared.HandlerManager$HandlerRegistry.access
$1(HandlerManager.java:53)
at
com.google.gwt.event.shared.HandlerManager.fireEvent(HandlerManager.java:
178)
at com.google.gwt.user.client.ui.Widget.fireEvent(Widget.java:52)
at
com.google.gwt.event.dom.client.DomEvent.fireNativeEvent(DomEvent.java:
116)
at com.google.gwt.user.client.ui.Widget.onBrowserEvent(Widget.java:
100)
at com.google.gwt.user.client.DOM.dispatchEventImpl(DOM.java:1307)
at com.google.gwt.user.client.DOM.dispatchEvent(DOM.java:1263)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
at java.lang.reflect.Method.invoke(Unknown Source)
at com.google.gwt.dev.shell.MethodAdaptor.invoke(MethodAdaptor.java:
103)
at com.google.gwt.dev.shell.MethodDispatch.invoke(MethodDispatch.java:
71)
at
com.google.gwt.dev.shell.OophmSessionHandler.invoke(OophmSessionHandler.java:
157)
at
com.google.gwt.dev.shell.BrowserChannel.reactToMessagesWhileWaitingForReturn(BrowserChannel.java:
1714)
at
com.google.gwt.dev.shell.BrowserChannelServer.invokeJavascript(BrowserChannelServer.java:
165)
at
com.google.gwt.dev.shell.ModuleSpaceOOPHM.doInvoke(ModuleSpaceOOPHM.java:
120)
at com.google.gwt.dev.shell.ModuleSpace.invokeNative(ModuleSpace.java:
507)
at
com.google.gwt.dev.shell.ModuleSpace.invokeNativeObject(ModuleSpace.java:
264)
at
com.google.gwt.dev.shell.JavaScriptHost.invokeNativeObject(JavaScriptHost.java:
91)
at com.google.gwt.core.client.impl.Impl.apply(Impl.java)
at com.google.gwt.core.client.impl.Impl.entry0(Impl.java:188)
at sun.reflect.GeneratedMethodAccessor9.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
at java.lang.reflect.Method.invoke(Unknown Source)
at com.google.gwt.dev.shell.MethodAdaptor.invoke(MethodAdaptor.java:
103)
at com.google.gwt.dev.shell.MethodDispatch.invoke(MethodDispatch.java:
71)
at
com.google.gwt.dev.shell.OophmSessionHandler.invoke(OophmSessionHandler.java:
157)
at
com.google.gwt.dev.shell.BrowserChannel.reactToMessages(BrowserChannel.java:
1669)
at
com.google.gwt.dev.shell.BrowserChannelServer.processConnection(BrowserChannelServer.java:
401)
at
com.google.gwt.dev.shell.BrowserChannelServer.run(BrowserChannelServer.java:
222)
at java.lang.Thread.run(Unknown Source)

Here is the Call of the method in my Module:

callback = new AsyncCallback() {

            @Override
            public void onFailure(Throwable caught) {
                GWT.log(caught.toString());
            }

            @Override
            public void onSuccess(Object result) {
                GWT.log("Works fine!");
            }

        };

        // In diesem Button werden die RPC Methoden genutzt
        this.btLogin.addClickHandler(new ClickHandler() {
            @Override
            public void onClick(ClickEvent event) {
                txtUser.setText(useradmin.PruefungLogin("compi",
"hello").toString());
            }
        });


This is the implementation of the service:

package ourProject.server.RPCUser;

import org.hibernate.Session;
import org.hibernate.criterion.Restrictions;

import ourProject.client.User.UserAdmin;
import ourProject.server.HibernateUtil;
import ourProject.server.useradmin.User;

import com.google.gwt.core.client.GWT;
import com.google.gwt.user.server.rpc.RemoteServiceServlet;


public class UserAdminImpl extends RemoteServiceServlet implements
UserAdmin {

    @Override
    public Integer PruefungLogin(String Name, String Passwort) {

        Session session =
HibernateUtil.getFactory().getCurrentSession();

        Name.toLowerCase();
        User user = (User) session.createCriteria(User.class)
        .add(Restrictions.naturalId()
                .set("Nick", Name)
        ).uniqueResult();

 
System.out.printf(user.getMailaddy(),user.getNick(),user.getPassword());

        if (user.getPassword() == Passwort) {
            session.close();
            GWT.log(Integer.toString(user.getUserId()));
            return user.getUserId();
        } else if (user.getPassword() == null) {
            GWT.log("das ergebnis ist null");
            session.close();
            return 10;
        }
        else {
            session.close();
            return 10;
        }
    }

Do somebody have a solution of hint where the problem can be?

Sorry for my bad english.

Best regards

Compi

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