前几天把GEF版本从3.0.1升级到了3.1M6，发现以前运行正常的GEF程序现在总出现下面这个异常，例如在我移动一个节点时，或者创建一个新节点时。
!
ENTRY org.eclipse.ui
4
0
2005
-
04
-
19
23
:
12
:
55.974
!
MESSAGE tried to access method org.eclipse.ui.views.properties.PropertySheetEntry.refreshFromRoot()V from class org.eclipse.gef.ui.properties.UndoablePropertySheetEntry
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STACK
0
java.lang.IllegalAccessError: tried to access method org.eclipse.ui.views.properties.PropertySheetEntry.refreshFromRoot()V from class org.eclipse.gef.ui.properties.UndoablePropertySheetEntry at org.eclipse.gef.ui.properties.UndoablePropertySheetEntry.access$
0
(UndoablePropertySheetEntry.java:
1
) at org.eclipse.gef.ui.properties.UndoablePropertySheetEntry$
1
.commandStackChanged(UndoablePropertySheetEntry.java:
103
) at org.eclipse.gef.commands.CommandStack.notifyListeners(CommandStack.java:
253
) at org.eclipse.gef.commands.CommandStack.execute(CommandStack.java:
141
) at org.eclipse.gef.tools.AbstractTool.executeCommand(AbstractTool.java:
374
) at org.eclipse.gef.tools.AbstractTool.executeCurrentCommand(AbstractTool.java:
386
) at org.eclipse.gef.tools.DragEditPartsTracker.performDrag(DragEditPartsTracker.java:
450
) at org.eclipse.gef.tools.DragEditPartsTracker.handleButtonUp(DragEditPartsTracker.java:
320
) at org.eclipse.gef.tools.AbstractTool.mouseUp(AbstractTool.java:
1035
) at org.eclipse.gef.tools.SelectionTool.mouseUp(SelectionTool.java:
545
) at org.eclipse.gef.EditDomain.mouseUp(EditDomain.java:
259
) at org.eclipse.gef.ui.parts.DomainEventDispatcher.dispatchMouseReleased(DomainEventDispatcher.java:
374
) at org.eclipse.draw2d.LightweightSystem$EventHandler.mouseUp(LightweightSystem.java:
548
) at org.eclipse.swt.widgets.TypedListener.handleEvent(TypedListener.java:
136
) at org.eclipse.swt.widgets.EventTable.sendEvent(EventTable.java:
82
) at org.eclipse.swt.widgets.Widget.sendEvent(Widget.java:
842
) at org.eclipse.swt.widgets.Display.runDeferredEvents(Display.java:
2908
) at org.eclipse.swt.widgets.Display.readAndDispatch(Display.java:
2541
) at org.eclipse.ui.internal.Workbench.runEventLoop(Workbench.java:
1612
) at org.eclipse.ui.internal.Workbench.runUI(Workbench.java:
1578
) at org.eclipse.ui.internal.Workbench.createAndRunWorkbench(Workbench.java:
293
) at org.eclipse.ui.PlatformUI.createAndRunWorkbench(PlatformUI.java:
144
) at org.eclipse.ui.internal.ide.IDEApplication.run(IDEApplication.java:
102
) at org.eclipse.core.internal.runtime.PlatformActivator$
1
.run(PlatformActivator.java:
228
) at org.eclipse.core.runtime.adaptor.EclipseStarter.run(EclipseStarter.java:
333
) at org.eclipse.core.runtime.adaptor.EclipseStarter.run(EclipseStarter.java:
150
) 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:
268
) at org.eclipse.core.launcher.Main.basicRun(Main.java:
260
) at org.eclipse.core.launcher.Main.run(Main.java:
887
) at org.eclipse.core.launcher.Main.main(Main.java:
871
)
调试了很久也没找到原因，最后在GEF新闻组里得到了答案，原来GEF3.1M6要求Eclipse的版本在3.1M6或以上，而我正在使用的是Eclipse 3.1M5a，换到3.1M6一试果然OK。
如果你遇到类似的奇怪异常，不妨也先检查一下Eclipse和插件的版本。
本文转自博客园八进制的博客，原文链接：由于Eclipse版本不符造成的异常，如需转载请自行联系原博主。
