NPE on GWTDesigner view

[normanmaurer]

Hi,

I installed the newest build of GWTDesigner + GWT 1.4.61. When I create a new "Composite" and try to open the designer view I get the error:

Designer was unable to find GUI elements in your source.
Check that open compilation unit is a gui class.

The Stacktrace is:
org.apache.commons.lang.exception.NestableError: java.lang.NullPointerException
at com.swtdesigner.gwt.model.widgets.UIObjectInfo.classByName(UIObjectInfo.java:186)
at com.swtdesigner.gwt.model.widgets.UIObjectInfo.<init>(UIObjectInfo.java:66)
at com.swtdesigner.gwt.model.widgets.WidgetInfo.<init>(WidgetInfo.java:50)
at com.swtdesigner.gwt.model.widgets.panel.AbstractContainerInfo.<init>(AbstractContainerInfo.java:35)
at com.swtdesigner.gwt.model.widgets.panel.ThisCompositeInfo.<init>(ThisCompositeInfo.java:45)
at com.swtdesigner.gwt.model.GWTJavaInfoFactory.create(GWTJavaInfoFactory.java:205)
at com.swtdesigner.model.parser.JavaInfoParser$ParserVisitor.visit(JavaInfoParser.java:2729)
at org.eclipse.jdt.core.dom.TypeDeclaration.accept0(TypeDeclaration.java:466)
at org.eclipse.jdt.core.dom.ASTNode.accept(ASTNode.java:2476)
at org.eclipse.jdt.core.dom.ASTNode.acceptChildren(ASTNode.java:2546)
at org.eclipse.jdt.core.dom.CompilationUnit.accept0(CompilationUnit.java:213)
at org.eclipse.jdt.core.dom.ASTNode.accept(ASTNode.java:2476)
at com.swtdesigner.model.parser.JavaInfoParser.parse(JavaInfoParser.java:320)
at com.swtdesigner.gef.DesignerEditor.parseCompilationUnit(DesignerEditor.java:1140)
at com.swtdesigner.gef.DesignerEditor$17.execute(DesignerEditor.java:1072)
at com.swtdesigner.model.swing.properties.custom.DesignTimeHelper.execute(DesignTimeHelper.java:54)
at com.swtdesigner.gef.DesignerEditor.handleActivate(DesignerEditor.java:1066)
at com.swtdesigner.gef.DesignerEditor.handleActivate(DesignerEditor.java:1059)
at com.swtdesigner.editors.MultiPageEditor.showDesignEditor(MultiPageEditor.java:426)
at com.swtdesigner.editors.MultiPageEditor$2.widgetSelected(MultiPageEditor.java:196)
at org.eclipse.swt.widgets.TypedListener.handleEvent(TypedListener.java:227)
at org.eclipse.swt.widgets.EventTable.sendEvent(EventTable.java:66)
at org.eclipse.swt.widgets.Widget.sendEvent(Widget.java:1101)
at org.eclipse.swt.widgets.Widget.sendEvent(Widget.java:1125)
at org.eclipse.swt.widgets.Widget.sendEvent(Widget.java:1110)
at org.eclipse.swt.widgets.Widget.notifyListeners(Widget.java:951)
at org.eclipse.swt.custom.CTabFolder.setSelection(CTabFolder.java:3227)
at org.eclipse.swt.custom.CTabFolder.onMouse(CTabFolder.java:2005)
at org.eclipse.swt.custom.CTabFolder$1.handleEvent(CTabFolder.java:316)
at org.eclipse.swt.widgets.EventTable.sendEvent(EventTable.java:66)
at org.eclipse.swt.widgets.Widget.sendEvent(Widget.java:1101)
at org.eclipse.swt.widgets.Display.runDeferredEvents(Display.java:3319)
at org.eclipse.swt.widgets.Display.readAndDispatch(Display.java:2971)
at org.eclipse.ui.internal.Workbench.runEventLoop(Workbench.java:2389)
at org.eclipse.ui.internal.Workbench.runUI(Workbench.java:2353)
at org.eclipse.ui.internal.Workbench.access$4(Workbench.java:2219)
at org.eclipse.ui.internal.Workbench$4.run(Workbench.java:466)
at org.eclipse.core.databinding.observable.Realm.runWithDefault(Realm.java:289)
at org.eclipse.ui.internal.Workbench.createAndRunWorkbench(Workbench.java:461)
at org.eclipse.ui.PlatformUI.createAndRunWorkbench(PlatformUI.java:149)
at org.eclipse.ui.internal.ide.application.IDEApplication.start(IDEApplication.java:106)
at org.eclipse.equinox.internal.app.EclipseAppHandle.run(EclipseAppHandle.java:169)
at org.eclipse.core.runtime.internal.adaptor.EclipseAppLauncher.runApplication(EclipseAppLauncher.java:106)
at org.eclipse.core.runtime.internal.adaptor.EclipseAppLauncher.start(EclipseAppLauncher.java:76)
at org.eclipse.core.runtime.adaptor.EclipseStarter.run(EclipseStarter.java:363)
at org.eclipse.core.runtime.adaptor.EclipseStarter.run(EclipseStarter.java:176)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
at java.lang.reflect.Method.invoke(Method.java:585)
at org.eclipse.equinox.launcher.Main.invokeFramework(Main.java:508)
at org.eclipse.equinox.launcher.Main.basicRun(Main.java:447)
at org.eclipse.equinox.launcher.Main.run(Main.java:1173)
at org.eclipse.equinox.launcher.Main.main(Main.java:1148)
Caused by: java.lang.NullPointerException
at com.swtdesigner.gwt.model.widgets.UIObjectInfo.getState(UIObjectInfo.java:399)
at com.swtdesigner.gwt.model.widgets.UIObjectInfo.classByName(UIObjectInfo.java:184)
... 53 more

What can be the problem

[Eric Clayberg]

What OS / distribution are you using?

What JDK / VM are you using?

[normanmaurer]

Dist:
Ubuntu gutsy 7.10 AMD64

norman@norman-laptop:~$ uname -a
Linux norman-laptop 2.6.22-14-generic #1 SMP Sun Oct 14 21:45:15 GMT 2007 x86_64 GNU/Linux


JVM:

norman@norman-laptop:~$ java -version
java version "1.5.0_13"
Java(TM) 2 Runtime Environment, Standard Edition (build 1.5.0_13-b05)
Java HotSpot(TM) 64-Bit Server VM (build 1.5.0_13-b05, mixed mode)


Note that I can lunch the GTW application in hosted mode without a problem..

Thx for the help

[Eric Clayberg]

Dist: Ubuntu gutsy 7.10 AMD64
JVM: Java HotSpot(TM) 64-Bit Server VM
Note that I can lunch the GTW application in hosted mode without a problem

Are you running hosted mode in a 32-bit VM?

The basic problem is that GWT doesn't support running in a 64-bit VM. If you configure Eclipse to run with a 32-bit VM, you should be able to use GWT Designer.

[normanmaurer]

Yes Im running it in 32 bit mode. In 64 bit the hosted mode was not workin ( as you said )....

So what can cause such a NPE ? I don't know the source code of GWTDesigner so I can't really be a help.

Just note that "pure" GWT works without problems in my Eclipse

[Eric Clayberg]

You need to run Eclipse (and thereby GWT Designer) using a 32-bit VM as well. More detail on this issue is available here...

http://code.google.com/p/google-web-too ... ail?id=135