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我遇到了 SWT TreeCursor 的问题。作为这个问题的示例，我将使用 Eclipse 网站中针对 TreeCursor 提供的“精确”示例：

http://git.eclipse.org/c/platform/eclipse.platform.swt.git/tree/examples/org.eclipse.swt.snippets/src/org/eclipse/swt/snippets/Snippet360.java

现在，这个例子运行得很好，但是如果你点击树中的任何地方，或者使用箭头键，从而使光标出现在屏幕上，在关闭程序时，这个堆栈跟踪会抛出一个异常：

Exception in thread "main" java.lang.IllegalArgumentException: Index out of bounds
at org.eclipse.swt.SWT.error(Unknown Source)
at org.eclipse.swt.SWT.error(Unknown Source)
at org.eclipse.swt.SWT.error(Unknown Source)
at org.eclipse.swt.widgets.Widget.error(Unknown Source)
at org.eclipse.swt.widgets.Tree.getItem(Unknown Source)
at org.eclipse.swt.custom.TreeCursor$3.handleEvent(Unknown Source)
at org.eclipse.swt.widgets.EventTable.sendEvent(Unknown Source)
at org.eclipse.swt.widgets.Display.sendEvent(Unknown Source)
at org.eclipse.swt.widgets.Widget.sendEvent(Unknown Source)
at org.eclipse.swt.widgets.Widget.sendEvent(Unknown Source)
at org.eclipse.swt.widgets.Widget.sendEvent(Unknown Source)
at org.eclipse.swt.widgets.Widget.release(Unknown Source)
at org.eclipse.swt.widgets.TreeItem.release(Unknown Source)
at org.eclipse.swt.widgets.Tree.releaseChildren(Unknown Source)
at org.eclipse.swt.widgets.Widget.release(Unknown Source)
at org.eclipse.swt.widgets.Control.release(Unknown Source)
at org.eclipse.swt.widgets.Composite.releaseChildren(Unknown Source)
at org.eclipse.swt.widgets.Canvas.releaseChildren(Unknown Source)
at org.eclipse.swt.widgets.Decorations.releaseChildren(Unknown Source)
at org.eclipse.swt.widgets.Shell.releaseChildren(Unknown Source)
at org.eclipse.swt.widgets.Widget.release(Unknown Source)
at org.eclipse.swt.widgets.Control.release(Unknown Source)
at org.eclipse.swt.widgets.Widget.dispose(Unknown Source)
at org.eclipse.swt.widgets.Shell.closeWidget(Unknown Source)
at org.eclipse.swt.widgets.Shell.windowShouldClose(Unknown Source)
at org.eclipse.swt.widgets.Display.windowProc(Unknown Source)
at org.eclipse.swt.internal.cocoa.OS.objc_msgSendSuper(Native Method)
at org.eclipse.swt.widgets.Widget.callSuper(Unknown Source)
at org.eclipse.swt.widgets.Widget.windowSendEvent(Unknown Source)
at org.eclipse.swt.widgets.Shell.windowSendEvent(Unknown Source)
at org.eclipse.swt.widgets.Display.windowProc(Unknown Source)
at org.eclipse.swt.internal.cocoa.OS.objc_msgSendSuper(Native Method)
at org.eclipse.swt.widgets.Display.applicationSendEvent(Unknown Source)
at org.eclipse.swt.widgets.Display.applicationProc(Unknown Source)
at org.eclipse.swt.internal.cocoa.OS.objc_msgSend(Native Method)
at org.eclipse.swt.internal.cocoa.NSApplication.sendEvent(Unknown Source)
at org.eclipse.swt.widgets.Display.readAndDispatch(Unknown Source)
at Snippet2.main(Snippet2.java:162)

这与您的代码无关。现在据我所知，这是 SWT 库中的一个问题，并且在处理游标时发生。从堆栈跟踪中可以看出，树项似乎是在释放游标之前释放的，因此当游标尝试访问 TreeItem 时，会发生异常。我目前正在使用一种解决方法，但我想看看是否有人对如何处理这个问题有任何想法。有什么想法吗？？！！

PS：我在 Mac OS X 上并使用 SWT 4.2。

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