I created a new repository for an existing Java project and attempted to generating UML diagrams. The generation failed in the first pass due to an IllegalArgumentException. Configuration summay and error message are below.

Configuration Summary:

*** Date: Tue Jul 25 17:01:02 PDT 2006

*** System properties:
OS=WindowsXP
OS version=5.1
Java version=1.5.0_06

*** MyEclipse details:
MyEclipse Enterprise Workbench

Version: 4.1.1 GA
Build id: 20060228-4.1.1-GA

*** Eclipse details:
Eclipse SDK

Version: 3.1.2
Build id: M20060118-1600

Eclipse Platform

Version: 3.1.2
Build id: M20060118-1600

Eclipse Java Development Tools

Version: 3.1.2
Build id: M20060118-1600

Eclipse Project SDK

Version: 3.1.2
Build id: M20060118-1600

Eclipse RCP

Version: 3.1.2
Build id: M20060118-1600

Eclipse Plug-in Development Environment

Version: 3.1.2
Build id: M20060118-1600

Eclipse startup command=-data
C:\eclipse-3.1.2-01\adapa-workspace
-os
win32
-ws
win32
-arch
x86
-launcher
C:\eclipse-3.1.2-01\eclipse.exe
-name
Eclipse
-showsplash
600
-exitdata
838_60
-vm
C:\WINDOWS\system32\javaw.exe

Error Log Entry:

!ENTRY org.eclipse.jdt.ui 4 10001 2006-07-25 16:40:49.721
!MESSAGE Internal Error
!STACK 0
java.lang.reflect.InvocationTargetException
at org.eclipse.jface.operation.ModalContext.runInCurrentThread(ModalContext.java:357)
at org.eclipse.jface.operation.ModalContext.run(ModalContext.java:291)
at org.eclipse.jface.wizard.WizardDialog.run(WizardDialog.java:830)
at com.genuitec.eclipse.core.portability.NewElementWizard.performFinish(NewElementWizard.java:112)
at org.eclipse.jface.wizard.WizardDialog.finishPressed(WizardDialog.java:676)
at org.eclipse.jface.wizard.WizardDialog.buttonPressed(WizardDialog.java:349)
at org.eclipse.jface.dialogs.Dialog$2.widgetSelected(Dialog.java:556)
at org.eclipse.swt.widgets.TypedListener.handleEvent(TypedListener.java:90)
at org.eclipse.swt.widgets.EventTable.sendEvent(EventTable.java:66)
at org.eclipse.swt.widgets.Widget.sendEvent(Widget.java:843)
at org.eclipse.swt.widgets.Display.runDeferredEvents(Display.java:3125)
at org.eclipse.swt.widgets.Display.readAndDispatch(Display.java:2758)
at org.eclipse.jface.window.Window.runEventLoop(Window.java:809)
at org.eclipse.jface.window.Window.open(Window.java:787)
at com.genuitec.eclipse.uml.action.UMLImportSourcesActionDelegate$2.run(UMLImportSourcesActionDelegate.java:72)
at org.eclipse.swt.widgets.RunnableLock.run(RunnableLock.java:35)
at org.eclipse.swt.widgets.Synchronizer.runAsyncMessages(Synchronizer.java:123)
at org.eclipse.swt.widgets.Display.runAsyncMessages(Display.java:3102)
at org.eclipse.swt.widgets.Display.readAndDispatch(Display.java:2761)
at org.eclipse.ui.internal.Workbench.runEventLoop(Workbench.java:1699)
at org.eclipse.ui.internal.Workbench.runUI(Workbench.java:1663)
at org.eclipse.ui.internal.Workbench.createAndRunWorkbench(Workbench.java:367)
at org.eclipse.ui.PlatformUI.createAndRunWorkbench(PlatformUI.java:143)
at org.eclipse.ui.internal.ide.IDEApplication.run(IDEApplication.java:103)
at org.eclipse.core.internal.runtime.PlatformActivator$1.run(PlatformActivator.java:226)
at org.eclipse.core.runtime.adaptor.EclipseStarter.run(EclipseStarter.java:376)
at org.eclipse.core.runtime.adaptor.EclipseStarter.run(EclipseStarter.java:163)
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 org.eclipse.core.launcher.Main.invokeFramework(Main.java:334)
at org.eclipse.core.launcher.Main.basicRun(Main.java:278)
at org.eclipse.core.launcher.Main.run(Main.java:973)
at org.eclipse.core.launcher.Main.main(Main.java:948)
Caused by: java.lang.IllegalArgumentException: handle: Parameter: return or type: Package: ScheduledTask
at org.argouml.model.uml.CoreHelperImpl.setType(CoreHelperImpl.java:3288)
at org.argouml.uml.reveng.java.Modeller.addOperation(Modeller.java:1538)
at com.genuitec.eclipse.uml.wizard.ReverseEngineerJavaWizard.parseFile(ReverseEngineerJavaWizard.java:441)
at com.genuitec.eclipse.uml.wizard.ReverseEngineerJavaWizard.doImport(ReverseEngineerJavaWizard.java:177)
at com.genuitec.eclipse.uml.wizard.ReverseEngineerJavaWizard.finishPage(ReverseEngineerJavaWizard.java:114)
at com.genuitec.eclipse.core.portability.NewElementWizard$2.run(NewElementWizard.java:105)
at org.eclipse.jdt.internal.core.BatchOperation.executeOperation(BatchOperation.java:39)
at org.eclipse.jdt.internal.core.JavaModelOperation.run(JavaModelOperation.java:718)
at org.eclipse.core.internal.resources.Workspace.run(Workspace.java:1721)
at org.eclipse.jdt.core.JavaCore.run(JavaCore.java:3761)
at org.eclipse.jdt.internal.ui.actions.WorkbenchRunnableAdapter.run(WorkbenchRunnableAdapter.java:87)
at org.eclipse.jface.operation.ModalContext.runInCurrentThread(ModalContext.java:346)
... 34 more
Root exception:
java.lang.IllegalArgumentException: handle: Parameter: return or type: Package: ScheduledTask
at org.argouml.model.uml.CoreHelperImpl.setType(CoreHelperImpl.java:3288)
at org.argouml.uml.reveng.java.Modeller.addOperation(Modeller.java:1538)
at com.genuitec.eclipse.uml.wizard.ReverseEngineerJavaWizard.parseFile(ReverseEngineerJavaWizard.java:441)
at com.genuitec.eclipse.uml.wizard.ReverseEngineerJavaWizard.doImport(ReverseEngineerJavaWizard.java:177)
at com.genuitec.eclipse.uml.wizard.ReverseEngineerJavaWizard.finishPage(ReverseEngineerJavaWizard.java:114)
at com.genuitec.eclipse.core.portability.NewElementWizard$2.run(NewElementWizard.java:105)
at org.eclipse.jdt.internal.core.BatchOperation.executeOperation(BatchOperation.java:39)
at org.eclipse.jdt.internal.core.JavaModelOperation.run(JavaModelOperation.java:718)
at org.eclipse.core.internal.resources.Workspace.run(Workspace.java:1721)
at org.eclipse.jdt.core.JavaCore.run(JavaCore.java:3761)
at org.eclipse.jdt.internal.ui.actions.WorkbenchRunnableAdapter.run(WorkbenchRunnableAdapter.java:87)
at org.eclipse.jface.operation.ModalContext.runInCurrentThread(ModalContext.java:346)
at org.eclipse.jface.operation.ModalContext.run(ModalContext.java:291)
at org.eclipse.jface.wizard.WizardDialog.run(WizardDialog.java:830)
at com.genuitec.eclipse.core.portability.NewElementWizard.performFinish(NewElementWizard.java:112)
at org.eclipse.jface.wizard.WizardDialog.finishPressed(WizardDialog.java:676)
at org.eclipse.jface.wizard.WizardDialog.buttonPressed(WizardDialog.java:349)
at org.eclipse.jface.dialogs.Dialog$2.widgetSelected(Dialog.java:556)
at org.eclipse.swt.widgets.TypedListener.handleEvent(TypedListener.java:90)
at org.eclipse.swt.widgets.EventTable.sendEvent(EventTable.java:66)
at org.eclipse.swt.widgets.Widget.sendEvent(Widget.java:843)
at org.eclipse.swt.widgets.Display.runDeferredEvents(Display.java:3125)
at org.eclipse.swt.widgets.Display.readAndDispatch(Display.java:2758)
at org.eclipse.jface.window.Window.runEventLoop(Window.java:809)
at org.eclipse.jface.window.Window.open(Window.java:787)
at com.genuitec.eclipse.uml.action.UMLImportSourcesActionDelegate$2.run(UMLImportSourcesActionDelegate.java:72)
at org.eclipse.swt.widgets.RunnableLock.run(RunnableLock.java:35)
at org.eclipse.swt.widgets.Synchronizer.runAsyncMessages(Synchronizer.java:123)
at org.eclipse.swt.widgets.Display.runAsyncMessages(Display.java:3102)
at org.eclipse.swt.widgets.Display.readAndDispatch(Display.java:2761)
at org.eclipse.ui.internal.Workbench.runEventLoop(Workbench.java:1699)
at org.eclipse.ui.internal.Workbench.runUI(Workbench.java:1663)
at org.eclipse.ui.internal.Workbench.createAndRunWorkbench(Workbench.java:367)
at org.eclipse.ui.PlatformUI.createAndRunWorkbench(PlatformUI.java:143)
at org.eclipse.ui.internal.ide.IDEApplication.run(IDEApplication.java:103)
at org.eclipse.core.internal.runtime.PlatformActivator$1.run(PlatformActivator.java:226)
at org.eclipse.core.runtime.adaptor.EclipseStarter.run(EclipseStarter.java:376)
at org.eclipse.core.runtime.adaptor.EclipseStarter.run(EclipseStarter.java:163)
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 org.eclipse.core.launcher.Main.invokeFramework(Main.java:334)
at org.eclipse.core.launcher.Main.basicRun(Main.java:278)
at org.eclipse.core.launcher.Main.run(Main.java:973)
at org.eclipse.core.launcher.Main.main(Main.java:948)

Is this standard Java code? Does it use any Java 5 features? Does it compile correctly? Are all the libraries on the project's build Path?