[Jcommander-tracker-notifications] [ jcommander-Bugs-2936161 ] NullPointerException or IndexOutOfBoundsException

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Bugs item #2936161, was opened at 2010-01-21 11:24
Message generated for change (Tracker Item Submitted) made by corneanu_dan
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Category: User Interface
Group: None
Status: Open
Resolution: None
Priority: 5
Private: No
Submitted By: Dan Corneanu (corneanu_dan)
Assigned to: Nobody/Anonymous (nobody)
Summary: NullPointerException or IndexOutOfBoundsException

Initial Comment:
Sometimes when changing the root of one of the panels, I get a NullPointerException or IndexOutOfBoundsException.
The exception is thrown from the FileControlModel.update() method. It seems to be a concurrent access problem. The class FileControlModel has 3 attributes that are related to each other and are used as shared resources: contents, sortedDetails, actualContents. The class is not thread safe and chances are that somehow the 
update() and getContent() step on each others foot.

There is a test in JCommanderUITest.fileControlModelUpdateException that sometimes reproduces the problem.
The stacktrace is:

org.eclipse.swt.SWTException: Failed to execute runnable (java.lang.NullPointerException)
	at org.eclipse.swt.SWT.error(SWT.java:3884)
	at org.eclipse.swt.SWT.error(SWT.java:3799)
	at org.eclipse.swt.widgets.Synchronizer.runAsyncMessages(Synchronizer.java:137)
	at org.eclipse.swt.widgets.Display.runAsyncMessages(Display.java:3855)
	at org.eclipse.swt.widgets.Display.readAndDispatch(Display.java:3476)
	at org.eclipse.ui.internal.Workbench.runEventLoop(Workbench.java:2405)
	at org.eclipse.ui.internal.Workbench.runUI(Workbench.java:2369)
	at org.eclipse.ui.internal.Workbench.access$4(Workbench.java:2221)
	at org.eclipse.ui.internal.Workbench$5.run(Workbench.java:500)
	at org.eclipse.core.databinding.observable.Realm.runWithDefault(Realm.java:332)
	at org.eclipse.ui.internal.Workbench.createAndRunWorkbench(Workbench.java:493)
	at org.eclipse.ui.PlatformUI.createAndRunWorkbench(PlatformUI.java:149)
	at org.jcommander.ui.app.PlatformRunnable$JCMDApplicationEntryPoint.startup(PlatformRunnable.java:114)
	at org.jcommander.ui.app.singleton.SingletonAppLauncher.startingFirstInstance(SingletonAppLauncher.java:76)
	at org.jcommander.ui.app.PlatformRunnable.start(PlatformRunnable.java:51)
	at org.eclipse.swtbot.eclipse.core.UITestApplication.start(UITestApplication.java:56)
	at org.eclipse.equinox.internal.app.EclipseAppHandle.run(EclipseAppHandle.java:194)
	at org.eclipse.core.runtime.internal.adaptor.EclipseAppLauncher.runApplication(EclipseAppLauncher.java:110)
	at org.eclipse.core.runtime.internal.adaptor.EclipseAppLauncher.start(EclipseAppLauncher.java:79)
	at org.eclipse.core.runtime.adaptor.EclipseStarter.run(EclipseStarter.java:368)
	at org.eclipse.core.runtime.adaptor.EclipseStarter.run(EclipseStarter.java:179)
	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:559)
	at org.eclipse.equinox.launcher.Main.basicRun(Main.java:514)
	at org.eclipse.equinox.launcher.Main.run(Main.java:1311)
	at org.eclipse.equinox.launcher.Main.main(Main.java:1287)
Caused by: java.lang.NullPointerException
	at org.jcommander.ui.filepanel.comparators.TableComparator.compare(TableComparator.java:36)
	at org.jcommander.ui.filepanel.controls.FileTableControl.getSorted(FileTableControl.java:406)
	at org.jcommander.ui.filepanel.model.FileControlModel.update(FileControlModel.java:609)
	at org.jcommander.ui.filepanel.controls.FileTableControl$9.run(FileTableControl.java:616)
	at org.eclipse.ui.internal.UILockListener.doPendingWork(UILockListener.java:155)
	at org.eclipse.ui.internal.UISynchronizer$3.run(UISynchronizer.java:158)
	at org.eclipse.swt.widgets.RunnableLock.run(RunnableLock.java:35)
	at org.eclipse.swt.widgets.Synchronizer.runAsyncMessages(Synchronizer.java:134)
	... 26 more

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