前不久重装系统，下载了3.7版本的eclipse。其它功能都挺好的，就是不能编辑xml文件。如果要修改xml文件的话，必须右击，选择用text editor的方法打开。之前一直没放在心上，今天下午终于把这个问题解决了。
打开一个xml文件，输入任何一个字符，回车，就会出现下面这个error:
Message:Unhandled event loop exception java.lang.AbstractMethodError: org.eclipse.wst.sse.ui.EditorExecutionContext.execute(Lorg/eclipse/core/runtime/ISafeRunnable;)V at org.eclipse.wst.sse.core.internal.text.JobSafeStructuredDocument.replace(JobSafeStructuredDocument.java:106) at org.eclipse.jface.text.projection.ProjectionTextStore.replace(ProjectionTextStore.java:111) at org.eclipse.jface.text.AbstractDocument.replace(AbstractDocument.java:1184) at org.eclipse.jface.text.AbstractDocument.replace(AbstractDocument.java:1210) at org.eclipse.jface.text.projection.ProjectionDocument.replace(ProjectionDocument.java:629) at org.eclipse.jface.text.DefaultDocumentAdapter.replaceTextRange(DefaultDocumentAdapter.java:248) at org.eclipse.swt.custom.StyledText.modifyContent(StyledText.java:7180) at org.eclipse.swt.custom.StyledText.sendKeyEvent(StyledText.java:7994) at org.eclipse.swt.custom.StyledText.doContent(StyledText.java:2456) at org.eclipse.swt.custom.StyledText.handleKey(StyledText.java:5911) at org.eclipse.swt.custom.StyledText.handleKeyDown(StyledText.java:5941) at org.eclipse.swt.custom.StyledText$7.handleEvent(StyledText.java:5635) at org.eclipse.swt.widgets.EventTable.sendEvent(EventTable.java:84) at org.eclipse.swt.widgets.Widget.sendEvent(Widget.java:1053) at org.eclipse.swt.widgets.Widget.sendEvent(Widget.java:1077) at org.eclipse.swt.widgets.Widget.sendEvent(Widget.java:1062) at org.eclipse.swt.widgets.Widget.sendKeyEvent(Widget.java:1104) at org.eclipse.swt.widgets.Widget.sendKeyEvent(Widget.java:1100) at org.eclipse.swt.widgets.Widget.wmChar(Widget.java:1509) at org.eclipse.swt.widgets.Control.WM_CHAR(Control.java:4640) at org.eclipse.swt.widgets.Canvas.WM_CHAR(Canvas.java:345) at org.eclipse.swt.widgets.Control.windowProc(Control.java:4528) at org.eclipse.swt.widgets.Canvas.windowProc(Canvas.java:341) at org.eclipse.swt.widgets.Display.windowProc(Display.java:4972) at org.eclipse.swt.internal.win32.OS.DispatchMessageW(Native Method) at org.eclipse.swt.internal.win32.OS.DispatchMessage(OS.java:2530) at org.eclipse.swt.widgets.Display.readAndDispatch(Display.java:3752) at org.eclipse.ui.internal.Workbench.runEventLoop(Workbench.java:2696) at org.eclipse.ui.internal.Workbench.runUI(Workbench.java:2660) at org.eclipse.ui.internal.Workbench.access$4(Workbench.java:2494) at org.eclipse.ui.internal.Workbench$7.run(Workbench.java:674) at org.eclipse.core.databinding.observable.Realm.runWithDefault(Realm.java:332) at org.eclipse.ui.internal.Workbench.createAndRunWorkbench(Workbench.java:667) at org.eclipse.ui.PlatformUI.createAndRunWorkbench(PlatformUI.java:149) at org.eclipse.ui.internal.ide.application.IDEApplication.start(IDEApplication.java:123) at org.eclipse.equinox.internal.app.EclipseAppHandle.run(EclipseAppHandle.java:196) at org.eclipse.core.runtime.internal.adaptor.EclipseAppLauncher.runApplication(EclipseAppLauncher.java:110) at org.eclipse.core.runtime.internal.adaptor.EclipseAppLauncher.start(EclipseAppLauncher.java:79) at org.eclipse.core.runtime.adaptor.EclipseStarter.run(EclipseStarter.java:344) at org.eclipse.core.runtime.adaptor.EclipseStarter.run(EclipseStarter.java:179) at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39) at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25) at java.lang.reflect.Method.invoke(Method.java:597) at org.eclipse.equinox.launcher.Main.invokeFramework(Main.java:622) at org.eclipse.equinox.launcher.Main.basicRun(Main.java:577) at org.eclipse.equinox.launcher.Main.run(Main.java:1410)
在网了搜了下，原来就是eclipse 3.7版本在win7里的一个Bug, 详见https://bugs.eclipse.org/bugs/show_bug.cgi?id=360242 。
大意就是，3.7和3.7.1版本里有两个插件，org.eclipse.wst.sse.core and org.eclipse.wst.sse.ui ，与eclipse的版本不一致或者不兼容什么的。
本来想找下有没有修复的办法，后来发现暂时还没有人提出什么行之有效的解决方案。
解铃还须系铃人。我又到官网上看了下，目前的最新版本是3.7.2，果断下载。谁知道，打开后还是有问题。考虑到还要再重新搭建环境什么的，我就不高兴了，直接升级版本的方法不可取。然后，我又抱着试一试的心态，在原先的3.7版本里，Help-> Check for Updates->select all. 结果，完全OK！
仔细一想，这个bug是去年11月份发布的，至今快半年了。看来eclipse的效率还是蛮高的，向他们致敬！