GWT Designer Stack Trace

[pegasuswebservices]

I added the GWT Designer to an existing project and I'm getting a stack trace. I email'd Tech Support who told me to compare it with the Test Project. I compared all, but didn't see anything obvious. I'm seeing a stack trace indicating a class not found for the gwtext Panel when switching from the Source to the Design tab.

The first error in the stack trace is: Caused by: java.lang.NoClassDefFoundError: com.gwtext.client.widgets.Panel
It looks like some kindof classpath problem for the GWT Designer tool as the application builds and runs fine.

Any help would be greatly appreciated. As I checked the Project Configuration and I'm stumped.

Here's the stack trace:

org.apache.commons.lang.exception.NestableError: com.swtdesigner.properties.PropertyException: java.lang.reflect.InvocationTargetException
at com.swtdesigner.model.parser.factory.JavaInfoFactory.create(JavaInfoFactory.java:119)
at com.swtdesigner.model.parser.factory.JavaInfoFactory.create(JavaInfoFactory.java:96)
at com.swtdesigner.model.parser.factory.JavaInfoFactory.create(JavaInfoFactory.java:89)
at com.swtdesigner.model.parser.JavaInfoParser$ParserVisitor.endVisit(JavaInfoParser.java:1446)
at org.eclipse.jdt.core.dom.ClassInstanceCreation.accept0(ClassInstanceCreation.java:336)
at org.eclipse.jdt.core.dom.ASTNode.accept(ASTNode.java:2476)
at org.eclipse.jdt.core.dom.ASTNode.acceptChild(ASTNode.java:2523)
at org.eclipse.jdt.core.dom.Assignment.accept0(Assignment.java:311)
at org.eclipse.jdt.core.dom.ASTNode.accept(ASTNode.java:2476)
at org.eclipse.jdt.core.dom.ASTNode.acceptChild(ASTNode.java:2523)
at org.eclipse.jdt.core.dom.ExpressionStatement.accept0(ExpressionStatement.java:143)
at org.eclipse.jdt.core.dom.ASTNode.accept(ASTNode.java:2476)
at org.eclipse.jdt.core.dom.ASTNode.acceptChildren(ASTNode.java:2546)
at org.eclipse.jdt.core.dom.Block.accept0(Block.java:135)
at org.eclipse.jdt.core.dom.ASTNode.accept(ASTNode.java:2476)
at org.eclipse.jdt.core.dom.ASTNode.acceptChild(ASTNode.java:2523)
at org.eclipse.jdt.core.dom.MethodDeclaration.accept0(MethodDeclaration.java:501)
at org.eclipse.jdt.core.dom.ASTNode.accept(ASTNode.java:2476)
at com.swtdesigner.model.parser.JavaInfoParser$ParserVisitor.visit(JavaInfoParser.java:3018)
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:319)
at com.swtdesigner.gef.DesignerEditor.parseCompilationUnit(DesignerEditor.java:1149)
at com.swtdesigner.gef.DesignerEditor$17.execute(DesignerEditor.java:1077)
at com.swtdesigner.model.swing.properties.custom.DesignTimeHelper.execute(DesignTimeHelper.java:54)
at com.swtdesigner.gef.DesignerEditor.handleActivate(DesignerEditor.java:1071)
at com.swtdesigner.gef.DesignerEditor.handleActivate(DesignerEditor.java:1062)
at com.swtdesigner.editors.MultiPageEditor.showDesignEditor(MultiPageEditor.java:391)
at com.swtdesigner.editors.MultiPageEditor$2.widgetSelected(MultiPageEditor.java:178)
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:938)
at org.eclipse.swt.widgets.Widget.sendEvent(Widget.java:962)
at org.eclipse.swt.widgets.Widget.sendEvent(Widget.java:947)
at org.eclipse.swt.widgets.Widget.notifyListeners(Widget.java:706)
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:938)
at org.eclipse.swt.widgets.Display.runDeferredEvents(Display.java:3682)
at org.eclipse.swt.widgets.Display.readAndDispatch(Display.java:3293)
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:597)
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)
Caused by: com.swtdesigner.properties.PropertyException: java.lang.reflect.InvocationTargetException
at com.swtdesigner.gwt.model.GWTJavaInfoFactory.create(GWTJavaInfoFactory.java:171)
at com.swtdesigner.model.parser.factory.JavaInfoFactory.create(JavaInfoFactory.java:113)
... 64 more
Caused by: java.lang.reflect.InvocationTargetException
at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:39)
at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:27)
at java.lang.reflect.Constructor.newInstance(Constructor.java:513)
at com.swtdesigner.gwt.model.GwtExtSupport.create(GwtExtSupport.java:117)
at com.swtdesigner.gwt.model.GWTJavaInfoFactory.create(GWTJavaInfoFactory.java:141)
... 65 more
Caused by: java.lang.NoClassDefFoundError: com.gwtext.client.widgets.Panel
at java.lang.Class.getDeclaredMethods0(Native Method)
at java.lang.Class.privateGetDeclaredMethods(Class.java:2427)
at java.lang.Class.getDeclaredMethods(Class.java:1791)
at java.beans.Introspector$1.run(Introspector.java:1272)
at java.security.AccessController.doPrivileged(Native Method)
at java.beans.Introspector.getPublicDeclaredMethods(Introspector.java:1270)
at java.beans.Introspector.getTargetMethodInfo(Introspector.java:1136)
at java.beans.Introspector.getBeanInfo(Introspector.java:387)
at java.beans.Introspector.getBeanInfo(Introspector.java:159)
at com.swtdesigner.model.swing.JavaBeanInfo.createSharedBeanDefinition(JavaBeanInfo.java:3172)
at com.swtdesigner.model.swing.JavaBeanInfo.getSharedBeanDefinition(JavaBeanInfo.java:3135)
at com.swtdesigner.model.swing.JavaBeanInfo.initClassAndBounds(JavaBeanInfo.java:1739)
at com.swtdesigner.gwt.model.widgets.UIObjectInfo.initClassAndBounds(UIObjectInfo.java:118)
at com.swtdesigner.model.swing.JavaBeanInfo.<init>(JavaBeanInfo.java:277)
at com.swtdesigner.gwt.model.widgets.UIObjectInfo.<init>(UIObjectInfo.java:68)
at com.swtdesigner.gwt.model.widgets.WidgetInfo.<init>(WidgetInfo.java:52)
at com.swtdesigner.gwt.model.widgets.GwtExtGridPanelInfo.<init>(GwtExtGridPanelInfo.java:32)
... 71 more

[Eric Clayberg]

A NoClassDefFoundError exception pointing to a GWT-Ext class typically means that you don't have your project configured to use GWT-Ext correctly.

Did you follow the instructions on the GWT-Ext web site?

What exact steps did you follow to add GWT-Ext to your project?

If our test project works for you and your project doesn't, your project must be missing something significant.

You can always send a test case, if you need further help.

[pegasuswebservices]

Two key factors here....This project has been using GWT-EXT and has building and running fine. It is only the transition from the Source Tab to the Design Tab does this problem occur.

As far as how this project was created. It was already created when I arrived here. If you need additional information I can pursue the answer to this. It is my understanding that it was created using Maven.

If you'd like I can zip up the project and email it to you.

-- Jeff

[Eric Clayberg]

If the project was not created with GWT Designer, have you converted it into a GWT Designer project yet?

Feel free to send us a test case any time you like.

[pegasuswebservices]

No I haven't. Are there directions somewhere that tell me how to do so?

-- Jeff

[Eric Clayberg]

No I haven't. Are there directions somewhere that tell me how to do so?

Yes. This is covered in the docs (both on-line and in your Eclipse Help).