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Sporadic NullPointerException during disposing of columns (getData by ColumnViewer in TableViewer) [message #333416] Wed, 10 December 2008 08:24 Go to next message
Eclipse UserFriend
Hello,

disposing columns of a TableViewer sometimes results in a
NullPointerExcpetion in getData of swt.widgets.Widget. Called by the
ColumnViewer.
It does not happen every time. We are able to reproduce it by creating
and disposing columns shortly after another. I' was not able to
reproduce why the data is null there. In our project we do not set it
manually.

An extract of the stack trace is following.

Thanks,
Florian

java.lang.NullPointerException

at org.eclipse.swt.widgets.Widget.getData(Widget.java:554)
at
org.eclipse.jface.viewers.ColumnViewer.getViewerColumn(Colum nViewer.java:186)
at
org.eclipse.jface.viewers.AbstractTableViewer.doUpdateItem(A bstractTableViewer.java:377)
at
org.eclipse.jface.viewers.StructuredViewer$UpdateItemSafeRun nable.run(StructuredViewer.java:466)
at org.eclipse.core.runtime.SafeRunner.run(SafeRunner.java:37)
at org.eclipse.core.runtime.Platform.run(Platform.java:880)
at org.eclipse.ui.internal.JFaceUtil$1.run(JFaceUtil.java:48)
at org.eclipse.jface.util.SafeRunnable.run(SafeRunnable.java:17 5)
at
org.eclipse.jface.viewers.StructuredViewer.updateItem(Struct uredViewer.java:2041)
at
org.eclipse.jface.viewers.AbstractTableViewer$1.handleEvent( AbstractTableViewer.java:84)
at org.eclipse.swt.widgets.EventTable.sendEvent(EventTable.java :84)
at org.eclipse.swt.widgets.Widget.sendEvent(Widget.java:1003)
at org.eclipse.swt.widgets.Widget.sendEvent(Widget.java:1027)
at org.eclipse.swt.widgets.Widget.sendEvent(Widget.java:1012)
at org.eclipse.swt.widgets.Table.checkData(Table.java:928)
at org.eclipse.swt.widgets.Table.wmNotifyChild(Table.java:6292)
at org.eclipse.swt.widgets.Control.wmNotify(Control.java:4718)
at org.eclipse.swt.widgets.Composite.wmNotify(Composite.java:17 56)
at org.eclipse.swt.widgets.Control.WM_NOTIFY(Control.java:4348)
at org.eclipse.swt.widgets.Control.windowProc(Control.java:3841 )
at org.eclipse.swt.widgets.Display.windowProc(Display.java:4541 )
at org.eclipse.swt.internal.win32.OS.CallWindowProcW(Native Method)
at org.eclipse.swt.internal.win32.OS.CallWindowProc(OS.java:227 4)
at org.eclipse.swt.widgets.Table.callWindowProc(Table.java:333)
at org.eclipse.swt.widgets.Table.callWindowProc(Table.java:199)
at org.eclipse.swt.widgets.Control.windowProc(Control.java:3877 )
at org.eclipse.swt.widgets.Table.windowProc(Table.java:5476)
at org.eclipse.swt.widgets.Display.windowProc(Display.java:4528 )
at org.eclipse.swt.internal.win32.OS.CallWindowProcW(Native Method)
at org.eclipse.swt.internal.win32.OS.CallWindowProc(OS.java:227 4)
at org.eclipse.swt.widgets.Table.callWindowProc(Table.java:333)
at org.eclipse.swt.widgets.Table.callWindowProc(Table.java:199)
at org.eclipse.swt.widgets.Control.windowProc(Control.java:3877 )
at org.eclipse.swt.widgets.Table.windowProc(Table.java:5476)
at org.eclipse.swt.widgets.Display.windowProc(Display.java:4528 )
at org.eclipse.swt.internal.win32.OS.CallWindowProcW(Native Method)
at org.eclipse.swt.internal.win32.OS.CallWindowProc(OS.java:227 4)
at org.eclipse.swt.widgets.Table.callWindowProc(Table.java:205)
at org.eclipse.swt.widgets.Table.callWindowProc(Table.java:199)
at org.eclipse.swt.widgets.Table.windowProc(Table.java:5388)
at org.eclipse.swt.widgets.Display.windowProc(Display.java:4541 )
at org.eclipse.swt.internal.win32.OS.CallWindowProcW(Native Method)
at org.eclipse.swt.internal.win32.OS.CallWindowProc(OS.java:227 4)
at org.eclipse.swt.widgets.Table.callWindowProc(Table.java:333)
at org.eclipse.swt.widgets.Table.callWindowProc(Table.java:199)
at org.eclipse.swt.widgets.Control.windowProc(Control.java:3877 )
at org.eclipse.swt.widgets.Table.windowProc(Table.java:5476)
at org.eclipse.swt.widgets.Display.windowProc(Display.java:4541 )
at org.eclipse.swt.internal.win32.OS.SendMessageW(Native Method)
at org.eclipse.swt.internal.win32.OS.SendMessage(OS.java:3022)
at org.eclipse.swt.widgets.Table.destroyItem(Table.java:1788)
at
org.eclipse.swt.widgets.TableColumn.destroyWidget(TableColum n.java:193)
at org.eclipse.swt.widgets.Widget.release(Widget.java:814)
at org.eclipse.swt.widgets.Widget.dispose(Widget.java:441)
at
de.fme.plantdoc.ui.listenAnzeiger.ColumnConfigurator.dispose OldColumns(ColumnConfigurator.java:200)
[...]
Re: Sporadic NullPointerException during disposing of columns (getData by ColumnViewer in TableViewe [message #333417 is a reply to message #333416] Wed, 10 December 2008 08:34 Go to previous message
Eclipse UserFriend
Please file a bug - the best would be if you modify one of our snippets
[1] to reproduce the problem.

Tom

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

Florian Bartels schrieb:
> Hello,
>
> disposing columns of a TableViewer sometimes results in a
> NullPointerExcpetion in getData of swt.widgets.Widget. Called by the
> ColumnViewer.
> It does not happen every time. We are able to reproduce it by creating
> and disposing columns shortly after another. I' was not able to
> reproduce why the data is null there. In our project we do not set it
> manually.
>
> An extract of the stack trace is following.
>
> Thanks,
> Florian
>
> java.lang.NullPointerException
>
> at org.eclipse.swt.widgets.Widget.getData(Widget.java:554)
> at
> org.eclipse.jface.viewers.ColumnViewer.getViewerColumn(Colum nViewer.java:186)
>
> at
> org.eclipse.jface.viewers.AbstractTableViewer.doUpdateItem(A bstractTableViewer.java:377)
>
> at
> org.eclipse.jface.viewers.StructuredViewer$UpdateItemSafeRun nable.run(StructuredViewer.java:466)
>
> at org.eclipse.core.runtime.SafeRunner.run(SafeRunner.java:37)
> at org.eclipse.core.runtime.Platform.run(Platform.java:880)
> at org.eclipse.ui.internal.JFaceUtil$1.run(JFaceUtil.java:48)
> at org.eclipse.jface.util.SafeRunnable.run(SafeRunnable.java:17 5)
> at
> org.eclipse.jface.viewers.StructuredViewer.updateItem(Struct uredViewer.java:2041)
>
> at
> org.eclipse.jface.viewers.AbstractTableViewer$1.handleEvent( AbstractTableViewer.java:84)
>
> at org.eclipse.swt.widgets.EventTable.sendEvent(EventTable.java :84)
> at org.eclipse.swt.widgets.Widget.sendEvent(Widget.java:1003)
> at org.eclipse.swt.widgets.Widget.sendEvent(Widget.java:1027)
> at org.eclipse.swt.widgets.Widget.sendEvent(Widget.java:1012)
> at org.eclipse.swt.widgets.Table.checkData(Table.java:928)
> at org.eclipse.swt.widgets.Table.wmNotifyChild(Table.java:6292)
> at org.eclipse.swt.widgets.Control.wmNotify(Control.java:4718)
> at org.eclipse.swt.widgets.Composite.wmNotify(Composite.java:17 56)
> at org.eclipse.swt.widgets.Control.WM_NOTIFY(Control.java:4348)
> at org.eclipse.swt.widgets.Control.windowProc(Control.java:3841 )
> at org.eclipse.swt.widgets.Display.windowProc(Display.java:4541 )
> at org.eclipse.swt.internal.win32.OS.CallWindowProcW(Native Method)
> at org.eclipse.swt.internal.win32.OS.CallWindowProc(OS.java:227 4)
> at org.eclipse.swt.widgets.Table.callWindowProc(Table.java:333)
> at org.eclipse.swt.widgets.Table.callWindowProc(Table.java:199)
> at org.eclipse.swt.widgets.Control.windowProc(Control.java:3877 )
> at org.eclipse.swt.widgets.Table.windowProc(Table.java:5476)
> at org.eclipse.swt.widgets.Display.windowProc(Display.java:4528 )
> at org.eclipse.swt.internal.win32.OS.CallWindowProcW(Native Method)
> at org.eclipse.swt.internal.win32.OS.CallWindowProc(OS.java:227 4)
> at org.eclipse.swt.widgets.Table.callWindowProc(Table.java:333)
> at org.eclipse.swt.widgets.Table.callWindowProc(Table.java:199)
> at org.eclipse.swt.widgets.Control.windowProc(Control.java:3877 )
> at org.eclipse.swt.widgets.Table.windowProc(Table.java:5476)
> at org.eclipse.swt.widgets.Display.windowProc(Display.java:4528 )
> at org.eclipse.swt.internal.win32.OS.CallWindowProcW(Native Method)
> at org.eclipse.swt.internal.win32.OS.CallWindowProc(OS.java:227 4)
> at org.eclipse.swt.widgets.Table.callWindowProc(Table.java:205)
> at org.eclipse.swt.widgets.Table.callWindowProc(Table.java:199)
> at org.eclipse.swt.widgets.Table.windowProc(Table.java:5388)
> at org.eclipse.swt.widgets.Display.windowProc(Display.java:4541 )
> at org.eclipse.swt.internal.win32.OS.CallWindowProcW(Native Method)
> at org.eclipse.swt.internal.win32.OS.CallWindowProc(OS.java:227 4)
> at org.eclipse.swt.widgets.Table.callWindowProc(Table.java:333)
> at org.eclipse.swt.widgets.Table.callWindowProc(Table.java:199)
> at org.eclipse.swt.widgets.Control.windowProc(Control.java:3877 )
> at org.eclipse.swt.widgets.Table.windowProc(Table.java:5476)
> at org.eclipse.swt.widgets.Display.windowProc(Display.java:4541 )
> at org.eclipse.swt.internal.win32.OS.SendMessageW(Native Method)
> at org.eclipse.swt.internal.win32.OS.SendMessage(OS.java:3022)
> at org.eclipse.swt.widgets.Table.destroyItem(Table.java:1788)
> at
> org.eclipse.swt.widgets.TableColumn.destroyWidget(TableColum n.java:193)
> at org.eclipse.swt.widgets.Widget.release(Widget.java:814)
> at org.eclipse.swt.widgets.Widget.dispose(Widget.java:441)
> at
> de.fme.plantdoc.ui.listenAnzeiger.ColumnConfigurator.dispose OldColumns(ColumnConfigurator.java:200)
>
> [...]
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