[rap-dev] Is this a bug?

[<fabian.lange@xxxxxxx>]

Hi,

I have been playing around with a view and suddenly got hit by a NullPointerException:

Sep 5, 2007 11:26:01 AM org.mortbay.jetty.servlet.ServletHandler handle

SEVERE: /rap?nocache=1188984361530:

java.lang.NullPointerException

      at org.eclipse.ui.internal.presentations.defaultpresentation.DefaultTabFolder.getTab(DefaultTabFolder.java:217)

      at org.eclipse.ui.internal.presentations.defaultpresentation.DefaultTabFolder.getSelection(DefaultTabFolder.java:232)

      at org.eclipse.ui.internal.presentations.defaultpresentation.DefaultTabFolder$3.widgetSelected(DefaultTabFolder.java:155)

      at org.eclipse.swt.events.SelectionEvent.dispatchToObserver(SelectionEvent.java:174)

      at org.eclipse.rwt.internal.events.Event.processEvent(Event.java:45)

      at org.eclipse.swt.events.TypedEvent.processEvent(TypedEvent.java:107)

      at org.eclipse.swt.events.TypedEvent.processEventClass(TypedEvent.java:192)

      at org.eclipse.swt.events.TypedEvent.processScheduledEvents(TypedEvent.java:124)

      at org.eclipse.swt.internal.widgets.displaykit.DisplayLCA.processAction(DisplayLCA.java:265)

      at org.eclipse.rwt.internal.lifecycle.ProcessAction.execute(ProcessAction.java:26)

      at org.eclipse.rwt.internal.lifecycle.RWTLifeCycle.executePhase(RWTLifeCycle.java:116)

      at org.eclipse.rwt.internal.lifecycle.RWTLifeCycle.execute(RWTLifeCycle.java:80)

      at org.eclipse.rwt.internal.service.LifeCycleServiceHandler$1.run(LifeCycleServiceHandler.java:62)

      at org.eclipse.rwt.internal.service.LifeCycleServiceHandler.internalService(LifeCycleServiceHandler.java:158)

      at org.eclipse.rwt.internal.service.LifeCycleServiceHandler.access$1(LifeCycleServiceHandler.java:148)

      at org.eclipse.rwt.internal.service.LifeCycleServiceHandler$LifeCycleServiceHandlerSync.doService(LifeCycleServiceHandler.java:138)

      at org.eclipse.rwt.internal.lifecycle.RWTLifeCycleServiceHandlerSync.access$2(RWTLifeCycleServiceHandlerSync.java:1)

      at org.eclipse.rwt.internal.lifecycle.RWTLifeCycleServiceHandlerSync$ServiceRunnable.run(RWTLifeCycleServiceHandlerSync.java:48)

      at java.lang.Thread.run(Unknown Source)

I had a look at the actual SWT and RWT code, and it looks the same. so there is no check for null in place.

So it looks like it is expected by contract that when the pullDownButton (DefaultTabFolder:217) recieves a widget selected event, the paneFolder it is nested in has a selection. which is read in 232 by getSelection:

return getTab(paneFolder.getSelection());

it is the getTab that here will recieve the "null" as parameter and will throw the NPE.
Has anybody seen this before? Is it a bug ? The code I looked at in swt has also no null checks in place, so it seems so that this selection has to be not null by contract.

.: Fabian