[news.eclipse.platform.swt] Re: TreeItem index out of bounds exception

[Tom Schindl <tom.schindl@xxxxxxxxxxxxxxx>]

Could you modify one of our snippets [1] and file a bug against Platform/UI?

[1]http://wiki.eclipse.org/JFaceSnippets

Chris Audley schrieb:
> With Eclipse 3.3.1.1 on win32:
>
> I'm running into an exception adding a large number of items (>220) to 
> an SWT Tree.  I'm using a TreeViewer that already has four items 
> displayed under the tree root.  I call 
> TreeViewer.add(TreeViewer.getRoot(), Object[]) to add an array of over 
> 400 items to the tree viewer in addition to the 4 already displayed. 
> Several of the items are filtered out before being passed to the SWT 
> Tree, so the ultimate number of items added is less.
>
> During the add, I get the following exception:
>
> Caused by: java.lang.IllegalArgumentException: Index out of bounds
> at org.eclipse.swt.SWT.error(SWT.java:3547)
> at org.eclipse.swt.SWT.error(SWT.java:3481)
> at org.eclipse.swt.SWT.error(SWT.java:3452)
> at org.eclipse.swt.widgets.TreeItem.findPrevious(TreeItem.java:210)
> at org.eclipse.swt.widgets.TreeItem.<init>(TreeItem.java:119)
> at 
> org.eclipse.jface.viewers.TreeViewer.createNewRowPart(TreeViewer.java:790)
> at org.eclipse.jface.viewers.TreeViewer.newItem(TreeViewer.java:302)
> at 
> org.eclipse.jface.viewers.AbstractTreeViewer.createTreeItem(AbstractTreeViewer.java:805) 
>
> at 
> org.eclipse.jface.viewers.AbstractTreeViewer.createAddedElements(AbstractTreeViewer.java:374) 
>
> at 
> org.eclipse.jface.viewers.AbstractTreeViewer.internalAdd(AbstractTreeViewer.java:265) 
>
> at org.eclipse.jface.viewers.TreeViewer.internalAdd(TreeViewer.java:645)
> at 
> org.eclipse.jface.viewers.AbstractTreeViewer.add(AbstractTreeViewer.java:139) 
>
> at 
> com.beacon.discovery.ui.databinding.ObservableSetTreeContentProvider.addViewerElements(ObservableSetTreeContentProvider.java:25) 
>
> at 
> com.beacon.discovery.ui.databinding.ObservableSetStructuredContentProvider.doDiff(ObservableSetStructuredContentProvider.java:103) 
>
> at 
> com.beacon.discovery.ui.databinding.ObservableSetStructuredContentProvider.access$2(ObservableSetStructuredContentProvider.java:97) 
>
> at 
> com.beacon.discovery.ui.databinding.ObservableSetStructuredContentProvider$1.handleSetChange(ObservableSetStructuredContentProvider.java:72) 
>
> at 
> org.eclipse.core.databinding.observable.set.SetChangeEvent.dispatch(SetChangeEvent.java:61) 
>
> at 
> org.eclipse.core.databinding.observable.ChangeManager.fireEvent(ChangeManager.java:128) 
>
> at 
> org.eclipse.core.databinding.observable.ChangeSupport.fireEvent(ChangeSupport.java:38) 
>
> at 
> org.eclipse.core.databinding.observable.set.AbstractObservableSet.fireSetChange(AbstractObservableSet.java:80) 
>
> at 
> com.beacon.discovery.ui.models.BidOfferMessageManager.access$0(BidOfferMessageManager.java:1) 
>
> at 
> com.beacon.discovery.ui.models.BidOfferMessageManager$Dispatcher.fireSetChange(BidOfferMessageManager.java:137) 
>
> at 
> com.beacon.discovery.ui.util.SetChangeDispatcher.run(SetChangeDispatcher.java:54) 
>
> at org.eclipse.swt.widgets.RunnableLock.run(RunnableLock.java:35)
> at 
> org.eclipse.swt.widgets.Synchronizer.runAsyncMessages(Synchronizer.java:123) 
>
> ... 23 more
>
> At AbstractTreeViewer.java:374, the loop variable is 218, so 218 of the 
> items have already been created in the tree, and the index for the new 
> item when the exception is thrown is 222.
>
> Does anyone have any ideas what could be causing this error.  Is te bug 
> mine or in SWT?
>
> Thanks
> Chris Audley


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Tom Schindl                                          JFace-Committer
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