GWT 编辑器错误？

Posted 2023-02-16

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【中文标题】GWT 编辑器错误？【英文标题】：GWT Editor bug? 【发布时间】：2012-06-23 10:43:52 【问题描述】：

这是我的开发环境：

ubuntu 12.04 LTS Eclipse 版本：3.7.2 (Indigo) 适用于 Eclipse 3.7 的 Google 插件谷歌网络工具包 2.4.0 GWT Designer 核心 2.5.0 GWT Designer GPE 2.5.0 WindowBuilder 核心 1.3.0 WindowBuilder CSS 支持 1.2.0 WindowBuilder XML 核心 1.3.0

我用“App Engine Connected android Project”创建了一个 gwt/app engine 项目，并做了很多修改（只是重构了几个名字）。

当我点击我的“ui.xml”gwt 文件时，我可以在 Eclipse 编辑器窗口的“XML Source”选项卡中显示它。

但是当我点击“设计”选项卡时，我收到以下错误：

Internal Error

encountered unexpected internal error.

This could be caused by a bug or by a misconfiguration issue, conflict, partial update, etc.

java.lang.NoClassDefFoundError: net/sf/cglib/proxy/Callback

堆栈跟踪：

java.lang.ClassNotFoundException: net.sf.cglib.proxy.Callback
at org.eclipse.osgi.internal.loader.BundleLoader.findClassInternal(BundleLoader.java:513)
at org.eclipse.osgi.internal.loader.BundleLoader.findClass(BundleLoader.java:429)
at org.eclipse.osgi.internal.loader.BundleLoader.findClass(BundleLoader.java:417)
at org.eclipse.osgi.internal.baseadaptor.DefaultClassLoader.loadClass(DefaultClassLoader.java:107)
at java.lang.ClassLoader.loadClass(ClassLoader.java:356)
at org.eclipse.wb.internal.core.xml.model.EditorContext.<init>(EditorContext.java:59)
at com.google.gdt.eclipse.designer.uibinder.parser.UiBinderContext.<init>(UiBinderContext.java:89)
at com.google.gdt.eclipse.designer.uibinder.editor.UiBinderDesignPage.parse(UiBinderDesignPage.java:101)
at org.eclipse.wb.internal.core.xml.editor.XmlDesignPage.internal_refreshGEF(XmlDesignPage.java:451)
at org.eclipse.wb.internal.core.xml.editor.XmlDesignPage.access$2(XmlDesignPage.java:443)
at org.eclipse.wb.internal.core.xml.editor.XmlDesignPage$7$1.run(XmlDesignPage.java:417)
at org.eclipse.swt.widgets.Synchronizer.syncExec(Synchronizer.java:180)
at org.eclipse.ui.internal.UISynchronizer.syncExec(UISynchronizer.java:150)
at org.eclipse.swt.widgets.Display.syncExec(Display.java:4330)
at org.eclipse.wb.internal.core.xml.editor.XmlDesignPage$7.run(XmlDesignPage.java:414)
at org.eclipse.jface.operation.ModalContext.runInCurrentThread(ModalContext.java:464)
at org.eclipse.jface.operation.ModalContext.run(ModalContext.java:372)
at org.eclipse.jface.dialogs.ProgressMonitorDialog.run(ProgressMonitorDialog.java:507)
at org.eclipse.wb.internal.core.xml.editor.XmlDesignPage.internal_refreshGEF_withProgress(XmlDesignPage.java:435)
at org.eclipse.wb.internal.core.xml.editor.XmlDesignPage.internal_refreshGEF(XmlDesignPage.java:388)
at org.eclipse.wb.internal.core.xml.editor.UndoManager.refreshDesignerEditor(UndoManager.java:252)
at org.eclipse.wb.internal.core.xml.editor.XmlDesignPage.updateGEF(XmlDesignPage.java:361)
at org.eclipse.wb.internal.core.xml.editor.XmlDesignPage.refreshGEF(XmlDesignPage.java:354)
at org.eclipse.wb.internal.core.xml.editor.actions.RefreshAction.run(RefreshAction.java:47)
at org.eclipse.wb.internal.core.xml.editor.actions.DesignPageAction.run(DesignPageAction.java:35)
at org.eclipse.wb.internal.core.xml.editor.XmlExceptionComposite.doRefresh(XmlExceptionComposite.java:65)
at org.eclipse.wb.internal.core.editor.errors.ExceptionComposite$3.widgetSelected(ExceptionComposite.java:129)
at org.eclipse.swt.widgets.TypedListener.handleEvent(TypedListener.java:240)
at org.eclipse.swt.widgets.EventTable.sendEvent(EventTable.java:84)
at org.eclipse.swt.widgets.Widget.sendEvent(Widget.java:1258)
at org.eclipse.swt.widgets.Display.runDeferredEvents(Display.java:3588)
at org.eclipse.swt.widgets.Display.readAndDispatch(Display.java:3209)
at org.eclipse.ui.internal.Workbench.runEventLoop(Workbench.java:2701)
at org.eclipse.ui.internal.Workbench.runUI(Workbench.java:2665)
at org.eclipse.ui.internal.Workbench.access$4(Workbench.java:2499)
at org.eclipse.ui.internal.Workbench$7.run(Workbench.java:679)
at org.eclipse.core.databinding.observable.Realm.runWithDefault(Realm.java:332)
at org.eclipse.ui.internal.Workbench.createAndRunWorkbench(Workbench.java:668)
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:57)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:601)
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)
at org.eclipse.equinox.launcher.Main.main(Main.java:1386)

完整的上下文堆栈跟踪：

java.lang.NoClassDefFoundError: net/sf/cglib/proxy/Callback
at org.eclipse.wb.internal.core.xml.model.EditorContext.<init>(EditorContext.java:59)
at com.google.gdt.eclipse.designer.uibinder.parser.UiBinderContext.<init>(UiBinderContext.java:89)
at com.google.gdt.eclipse.designer.uibinder.editor.UiBinderDesignPage.parse(UiBinderDesignPage.java:101)
at org.eclipse.wb.internal.core.xml.editor.XmlDesignPage.internal_refreshGEF(XmlDesignPage.java:451)
at org.eclipse.wb.internal.core.xml.editor.XmlDesignPage.access$2(XmlDesignPage.java:443)
at org.eclipse.wb.internal.core.xml.editor.XmlDesignPage$7$1.run(XmlDesignPage.java:417)
at org.eclipse.swt.widgets.Synchronizer.syncExec(Synchronizer.java:180)
at org.eclipse.ui.internal.UISynchronizer.syncExec(UISynchronizer.java:150)
at org.eclipse.swt.widgets.Display.syncExec(Display.java:4330)
at org.eclipse.wb.internal.core.xml.editor.XmlDesignPage$7.run(XmlDesignPage.java:414)
at org.eclipse.jface.operation.ModalContext.runInCurrentThread(ModalContext.java:464)
at org.eclipse.jface.operation.ModalContext.run(ModalContext.java:372)
at org.eclipse.jface.dialogs.ProgressMonitorDialog.run(ProgressMonitorDialog.java:507)
at org.eclipse.wb.internal.core.xml.editor.XmlDesignPage.internal_refreshGEF_withProgress(XmlDesignPage.java:435)
at org.eclipse.wb.internal.core.xml.editor.XmlDesignPage.internal_refreshGEF(XmlDesignPage.java:388)
at org.eclipse.wb.internal.core.xml.editor.UndoManager.refreshDesignerEditor(UndoManager.java:252)
at org.eclipse.wb.internal.core.xml.editor.XmlDesignPage.updateGEF(XmlDesignPage.java:361)
at org.eclipse.wb.internal.core.xml.editor.XmlDesignPage.refreshGEF(XmlDesignPage.java:354)
at org.eclipse.wb.internal.core.xml.editor.actions.RefreshAction.run(RefreshAction.java:47)
at org.eclipse.wb.internal.core.xml.editor.actions.DesignPageAction.run(DesignPageAction.java:35)
at org.eclipse.wb.internal.core.xml.editor.XmlExceptionComposite.doRefresh(XmlExceptionComposite.java:65)
at org.eclipse.wb.internal.core.editor.errors.ExceptionComposite$3.widgetSelected(ExceptionComposite.java:129)
at org.eclipse.swt.widgets.TypedListener.handleEvent(TypedListener.java:240)
at org.eclipse.swt.widgets.EventTable.sendEvent(EventTable.java:84)
at org.eclipse.swt.widgets.Widget.sendEvent(Widget.java:1258)
at org.eclipse.swt.widgets.Display.runDeferredEvents(Display.java:3588)
at org.eclipse.swt.widgets.Display.readAndDispatch(Display.java:3209)
at org.eclipse.ui.internal.Workbench.runEventLoop(Workbench.java:2701)
at org.eclipse.ui.internal.Workbench.runUI(Workbench.java:2665)
at org.eclipse.ui.internal.Workbench.access$4(Workbench.java:2499)
at org.eclipse.ui.internal.Workbench$7.run(Workbench.java:679)
at org.eclipse.core.databinding.observable.Realm.runWithDefault(Realm.java:332)
at org.eclipse.ui.internal.Workbench.createAndRunWorkbench(Workbench.java:668)
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:57)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:601)
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)
at org.eclipse.equinox.launcher.Main.main(Main.java:1386)
Caused by: java.lang.ClassNotFoundException: net.sf.cglib.proxy.Callback
at org.eclipse.osgi.internal.loader.BundleLoader.findClassInternal(BundleLoader.java:513)
at org.eclipse.osgi.internal.loader.BundleLoader.findClass(BundleLoader.java:429)
at org.eclipse.osgi.internal.loader.BundleLoader.findClass(BundleLoader.java:417)
at org.eclipse.osgi.internal.baseadaptor.DefaultClassLoader.loadClass(DefaultClassLoader.java:107)
at java.lang.ClassLoader.loadClass(ClassLoader.java:356)
... 48 more

【问题讨论】：

【参考方案1】：

堆栈跟踪中的重要行是：

java.lang.ClassNotFoundException: net.sf.cglib.proxy.Callback

显然，在您的 GWT 代码的某处，您从 net.sf.cglib.proxypackage 引用了 Callbackclass。如果您在 GWT 代码中引用任何包或类，您必须拥有源代码，以便 GWT 编译器能够将其转换为 javascript。

然而，这个net.sf.cglib.proxypackage 属于 cglib.jar，它是一个字节码操作库。 GWT 不支持此库。检查您的源代码以获取对net.sf.cglib.proxy.Callback 的引用。我假设您导入了错误的包。

【讨论】：

我的代码开头是：。也许我错了，但我没有找到任何对 net.sf.cglib.proxy 包的引用检查您的 java 文件是否有任何引用。对此感到抱歉。我安装了 GWT Designer (dl.google.com/eclipse/inst/d2gwt/latest/3.7)，现在可以打开“设计”选项卡。

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