eclipse插件依赖项和classnotfoundexception

I am new to Eclipse RCP plugin development and I have the following problem: I am trying to instantiate a MessageConsole object in my plugin. I create the appropriate dependency for org.eclipse.ui.console in MANIFEST.MF, build the plugin, and then load the plugin inside the same Eclipse application (I export the plugin as a zip, shutdown Eclipse, unzip and copy the plugin into Eclipse's plugin directory, restart Eclipse). I get a NoClassDefFoundError when that plugin is loaded. If I uncomment the single source code line (see below) that tries to instantiate a MessageConsole, the plugin works fine. Details are as follows.

我是Eclipse RCP插件开发的新手,我有以下问题:我试图在我的插件中实例化一个MessageConsole对象。我在MANIFEST.MF中为org.eclipse.ui.console创建了适当的依赖项,构建了插件,然后在同一个Eclipse应用程序中加载插件(我将插件导出为zip,关闭Eclipse,解压缩并将插件复制到Eclipse的插件目录,重启Eclipse)。加载该插件时,我得到一个NoClassDefFoundError。如果我取消注释试图实例化MessageConsole的单个源代码行(见下文),该插件工作正常。细节如下。

MANIFEST.MF:

Manifest-Version: 1.0
Bundle-ManifestVersion: 2
Bundle-Name: IntrospectorPlugin Plug-in
Bundle-SymbolicName: IntrospectorPlugin; singleton:=true
Bundle-Version: 1.0.1
Bundle-Activator: introspectorplugin.Activator
Require-Bundle: org.eclipse.ui,
 org.eclipse.core.runtime,
 org.eclipse.ui.console
Bundle-ActivationPolicy: lazy
Bundle-RequiredExecutionEnvironment: JavaSE-1.6

IntrospectorView.java:

import org.eclipse.ui.console.ConsolePlugin;
import org.eclipse.ui.console.IConsole;
import org.eclipse.ui.console.IConsoleConstants;
import org.eclipse.ui.console.IConsoleView;
import org.eclipse.ui.console.MessageConsole;
import org.eclipse.ui.console.MessageConsoleStream;
...
     MessageConsole myConsole = new MessageConsole("IntrospectorView plugin console",
        imageDescriptorConsole);

Exception:

java.lang.ClassNotFoundException: org.eclipse.ui.console.MessageConsole
    at org.eclipse.osgi.framework.internal.core.BundleLoader.findClassInternal(BundleLoader.java:483)
    at org.eclipse.osgi.framework.internal.core.BundleLoader.findClass(BundleLoader.java:399)
    at org.eclipse.osgi.framework.internal.core.BundleLoader.findClass(BundleLoader.java:387)
    at org.eclipse.osgi.internal.baseadaptor.DefaultClassLoader.loadClass(DefaultClassLoader.java:87)
    at java.lang.ClassLoader.loadClass(Unknown Source)
    at java.lang.ClassLoader.loadClassInternal(Unknown Source)
    at introspectorplugin.views.IntrospectorView.makeConsole(IntrospectorView.java:453)
    at introspectorplugin.views.IntrospectorView.createPartControl(IntrospectorView.java:436)
    at org.eclipse.ui.internal.ViewReference.createPartHelper(ViewReference.java:371)
    at org.eclipse.ui.internal.ViewReference.createPart(ViewReference.java:230)
    at org.eclipse.ui.internal.WorkbenchPartReference.getPart(WorkbenchPartReference.java:594)
    at org.eclipse.ui.internal.PartPane.setVisible(PartPane.java:306)
    at org.eclipse.ui.internal.ViewPane.setVisible(ViewPane.java:531)
    at org.eclipse.ui.internal.presentations.PresentablePart.setVisible(PresentablePart.java:180)
    at org.eclipse.ui.internal.presentations.util.PresentablePartFolder.select(PresentablePartFolder.java:270)
    at org.eclipse.ui.internal.presentations.util.LeftToRightTabOrder.select(LeftToRightTabOrder.java:65)
    at org.eclipse.ui.internal.presentations.util.TabbedStackPresentation.selectPart(TabbedStackPresentation.java:473)
    at org.eclipse.ui.internal.PartStack.refreshPresentationSelection(PartStack.java:1256)
    at org.eclipse.ui.internal.PartStack.createControl(PartStack.java:668)
    at org.eclipse.ui.internal.PartStack.createControl(PartStack.java:576)
    at org.eclipse.ui.internal.PartSashContainer.createControl(PartSashContainer.java:568)
    at org.eclipse.ui.internal.PerspectiveHelper.activate(PerspectiveHelper.java:271)
    at org.eclipse.ui.internal.Perspective.onActivate(Perspective.java:968)
    at org.eclipse.ui.internal.WorkbenchPage.onActivate(WorkbenchPage.java:2593)
    at org.eclipse.ui.internal.WorkbenchWindow$25.run(WorkbenchWindow.java:2873)
    at org.eclipse.swt.custom.BusyIndicator.showWhile(BusyIndicator.java:70)
    at org.eclipse.ui.internal.WorkbenchWindow.setActivePage(WorkbenchWindow.java:2854)
    at org.eclipse.ui.internal.WorkbenchWindow$19.runWithException(WorkbenchWindow.java:2171)
    at org.eclipse.ui.internal.StartupThreading$StartupRunnable.run(StartupThreading.java:31)
    at org.eclipse.swt.widgets.RunnableLock.run(RunnableLock.java:35)
    at org.eclipse.swt.widgets.Synchronizer.runAsyncMessages(Synchronizer.java:133)
    at org.eclipse.swt.widgets.Display.runAsyncMessages(Display.java:3800)
    at org.eclipse.swt.widgets.Display.readAndDispatch(Display.java:3425)
    at org.eclipse.ui.application.WorkbenchAdvisor.openWindows(WorkbenchAdvisor.java:803)
    at org.eclipse.ui.internal.Workbench$27.runWithException(Workbench.java:1363)
    at org.eclipse.ui.internal.StartupThreading$StartupRunnable.run(StartupThreading.java:31)
    at org.eclipse.swt.widgets.RunnableLock.run(RunnableLock.java:35)
    at org.eclipse.swt.widgets.Synchronizer.runAsyncMessages(Synchronizer.java:133)
    at org.eclipse.swt.widgets.Display.runAsyncMessages(Display.java:3800)
    at org.eclipse.swt.widgets.Display.readAndDispatch(Display.java:3425)
    at org.eclipse.ui.internal.Workbench.runUI(Workbench.java:2295)
    at org.eclipse.ui.internal.Workbench.access$4(Workbench.java:2200)
    at org.eclipse.ui.internal.Workbench$5.run(Workbench.java:495)
    at org.eclipse.core.databinding.observable.Realm.runWithDefault(Realm.java:288)
    at org.eclipse.ui.internal.Workbench.createAndRunWorkbench(Workbench.java:490)
    at org.eclipse.ui.PlatformUI.createAndRunWorkbench(PlatformUI.java:149)
    at org.eclipse.ui.internal.ide.application.IDEApplication.start(IDEApplication.java:113)
    at org.eclipse.equinox.internal.app.EclipseAppHandle.run(EclipseAppHandle.java:193)
    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:386)
    at org.eclipse.core.runtime.adaptor.EclipseStarter.run(EclipseStarter.java:179)
    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.equinox.launcher.Main.invokeFramework(Main.java:549)
    at org.eclipse.equinox.launcher.Main.basicRun(Main.java:504)
    at org.eclipse.equinox.launcher.Main.run(Main.java:1236)

I looked through my Plugins book which talks about making sure that compile-time dependencies much target run-time dependencies -- if I run the plugin in the same Eclipse executable that I build, I should not have this issue? Furthermore, I've descended down the plug-in dependencies tree and verified I have all necessary plugins.

我查看了我的插件书,其中讨论了确保编译时依赖项更多地针对运行时依赖项 - 如果我在我构建的相同Eclipse可执行文件中运行插件,我不应该有这个问题吗?此外,我已经下载了插件依赖树,并验证了我有所有必要的插件。

All help is appreciated, thanks!

感谢所有帮助,谢谢!

2 个解决方案

#1

I installed a newer version of Eclipse today, added my plugin into the plugins directory and everything works well. Obviously I've encountered some configuration issue or a quirk. My previous version was Ganymede and now I'm running Galileo.

我今天安装了更新版本的Eclipse,将我的插件添加到plugins目录中,一切正常。显然我遇到了一些配置问题或怪癖。我之前的版本是Ganymede,现在我正在运行Galileo。

#2

You could try and compare your implementation with other example and projects including a Console view, like:

您可以尝试将您的实现与其他示例和项目(包括Console视图)进行比较,例如:

this thread (and its attached zip)

这个帖子(及其附加的拉链)

this Java Platform Logging Support

此Java平台日志记录支持

In both case, check their dependencies (plugin.xml or the MANIFEST.MF) in order to see what the difference is, hopefully explaining why your plugin does not include the relevant classes.

在这两种情况下,检查它们的依赖项(plugin.xml或MANIFEST.MF)以查看区别是什么,希望解释为什么您的插件不包含相关类。

#1

#2