Eclipse E4：糟糕的 Eclipse/OSGI 核心 NullPointerException（等）在启动时终止应用程序

Question

一直定期运行测试 E4 应用程序（通过 Eclipse IDE），没有太多问题。但是，我刚刚在启动 (RUN/DEBUG) 时遇到了一个错误，它在应用程序启动之前终止了它。它在显示任何窗口之前就死了。我不知道为什么会这样。

通过DEBUG，我遇到的第一个错误（NullPointerException）在：

org.eclipse.core.internal.resources.CharsetDeltaJob class: at line 206 (the Platform. call):

public void startup() {
    Platform.getContentTypeManager().addContentTypeChangeListener(this);
}

我还在终端或日志中收到大量错误消息。我找不到我的任何代码的参考。这一切似乎都是 Eclipse 的核心内容。我将在此消息的末尾包含它们。问题：

1) 有什么方法可以确保 OSGi 系统在新的 DEBUG/RUN 调用时完全重启？

2) 这种“深层次”的错误是否常见？

3) 对调试这类东西有什么建议吗？我在 Eclipse/E4 上取得了一些成功，但是如果这种级别的错误很常见，我不确定我是否能够继续。

堆栈跟踪：

org.osgi.framework.BundleException: Exception in org.eclipse.core.resources.ResourcesPlugin.start() of bundle org.eclipse.core.resources.
at org.eclipse.osgi.internal.framework.BundleContextImpl.startActivator(BundleContextImpl.java:792)
at org.eclipse.osgi.internal.framework.BundleContextImpl.start(BundleContextImpl.java:721)
at org.eclipse.osgi.internal.framework.EquinoxBundle.startWorker0(EquinoxBundle.java:941)
at org.eclipse.osgi.internal.framework.EquinoxBundle$EquinoxModule.startWorker(EquinoxBundle.java:318)
at org.eclipse.osgi.container.Module.doStart(Module.java:571)
at org.eclipse.osgi.container.Module.start(Module.java:439)
at org.eclipse.osgi.framework.util.SecureAction.start(SecureAction.java:454)
at org.eclipse.osgi.internal.hooks.EclipseLazyStarter.postFindLocalClass(EclipseLazyStarter.java:107)
at org.eclipse.osgi.internal.loader.classpath.ClasspathManager.findLocalClass(ClasspathManager.java:531)
at org.eclipse.osgi.internal.loader.ModuleClassLoader.findLocalClass(ModuleClassLoader.java:324)
at org.eclipse.osgi.internal.loader.BundleLoader.findLocalClass(BundleLoader.java:320)
at org.eclipse.osgi.internal.loader.sources.SingleSourcePackage.loadClass(SingleSourcePackage.java:36)
at org.eclipse.osgi.internal.loader.BundleLoader.findClassInternal(BundleLoader.java:391)
at org.eclipse.osgi.internal.loader.BundleLoader.findClass(BundleLoader.java:345)
at org.eclipse.osgi.internal.loader.BundleLoader.findClass(BundleLoader.java:337)
at org.eclipse.osgi.internal.loader.ModuleClassLoader.loadClass(ModuleClassLoader.java:160)
at java.lang.ClassLoader.loadClass(Unknown Source)
at org.eclipse.emf.ecore.plugin.EcorePlugin.getWorkspaceRoot(EcorePlugin.java:1131)
at org.eclipse.emf.ecore.resource.impl.ExtensibleURIConverterImpl.<clinit>(ExtensibleURIConverterImpl.java:393)
at org.eclipse.emf.ecore.resource.impl.ResourceSetImpl.getURIConverter(ResourceSetImpl.java:499)
at org.eclipse.emf.ecore.resource.impl.ResourceSetImpl.getResource(ResourceSetImpl.java:369)
at org.eclipse.e4.ui.internal.workbench.ResourceHandler.getResource(ResourceHandler.java:350)
at org.eclipse.e4.ui.internal.workbench.ResourceHandler.loadResource(ResourceHandler.java:326)
at org.eclipse.e4.ui.internal.workbench.ResourceHandler.loadMostRecentModel(ResourceHandler.java:243)
at org.eclipse.e4.ui.internal.workbench.swt.E4Application.loadApplicationModel(E4Application.java:394)
at org.eclipse.e4.ui.internal.workbench.swt.E4Application.createE4Workbench(E4Application.java:248)
at org.eclipse.e4.ui.internal.workbench.swt.E4Application.start(E4Application.java:143)
at org.eclipse.equinox.internal.app.EclipseAppHandle.run(EclipseAppHandle.java:196)
at org.eclipse.core.runtime.internal.adaptor.EclipseAppLauncher.runApplication(EclipseAppLauncher.java:134)
at org.eclipse.core.runtime.internal.adaptor.EclipseAppLauncher.start(EclipseAppLauncher.java:104)
at org.eclipse.core.runtime.adaptor.EclipseStarter.run(EclipseStarter.java:380)
at org.eclipse.core.runtime.adaptor.EclipseStarter.run(EclipseStarter.java:235)
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:648)
at org.eclipse.equinox.launcher.Main.basicRun(Main.java:603)
at org.eclipse.equinox.launcher.Main.run(Main.java:1465)
at org.eclipse.equinox.launcher.Main.main(Main.java:1438)
Caused by: java.lang.NullPointerException
at org.eclipse.core.internal.resources.CharsetDeltaJob.startup(CharsetDeltaJob.java:206)
at org.eclipse.core.internal.resources.CharsetManager.startup(CharsetManager.java:502)
at org.eclipse.core.internal.resources.Workspace.startup(Workspace.java:2468)
at org.eclipse.core.internal.resources.Workspace.open(Workspace.java:2219)
at org.eclipse.core.resources.ResourcesPlugin.start(ResourcesPlugin.java:463)
at org.eclipse.osgi.internal.framework.BundleContextImpl$3.run(BundleContextImpl.java:771)
at org.eclipse.osgi.internal.framework.BundleContextImpl$3.run(BundleContextImpl.java:1)
at java.security.AccessController.doPrivileged(Native Method)
at org.eclipse.osgi.internal.framework.BundleContextImpl.startActivator(BundleContextImpl.java:764)
... 39 more
Root exception:
java.lang.NullPointerException
at org.eclipse.core.internal.resources.CharsetDeltaJob.startup(CharsetDeltaJob.java:206)
at org.eclipse.core.internal.resources.CharsetManager.startup(CharsetManager.java:502)
at org.eclipse.core.internal.resources.Workspace.startup(Workspace.java:2468)
at org.eclipse.core.internal.resources.Workspace.open(Workspace.java:2219)
at org.eclipse.core.resources.ResourcesPlugin.start(ResourcesPlugin.java:463)
at org.eclipse.osgi.internal.framework.BundleContextImpl$3.run(BundleContextImpl.java:771)
at org.eclipse.osgi.internal.framework.BundleContextImpl$3.run(BundleContextImpl.java:1)
at java.security.AccessController.doPrivileged(Native Method)
at org.eclipse.osgi.internal.framework.BundleContextImpl.startActivator(BundleContextImpl.java:764)
at org.eclipse.osgi.internal.framework.BundleContextImpl.start(BundleContextImpl.java:721)
at org.eclipse.osgi.internal.framework.EquinoxBundle.startWorker0(EquinoxBundle.java:941)
at org.eclipse.osgi.internal.framework.EquinoxBundle$EquinoxModule.startWorker(EquinoxBundle.java:318)
at org.eclipse.osgi.container.Module.doStart(Module.java:571)
at org.eclipse.osgi.container.Module.start(Module.java:439)
at org.eclipse.osgi.framework.util.SecureAction.start(SecureAction.java:454)
at org.eclipse.osgi.internal.hooks.EclipseLazyStarter.postFindLocalClass(EclipseLazyStarter.java:107)
at org.eclipse.osgi.internal.loader.classpath.ClasspathManager.findLocalClass(ClasspathManager.java:531)
at org.eclipse.osgi.internal.loader.ModuleClassLoader.findLocalClass(ModuleClassLoader.java:324)
at org.eclipse.osgi.internal.loader.BundleLoader.findLocalClass(BundleLoader.java:320)
at org.eclipse.osgi.internal.loader.sources.SingleSourcePackage.loadClass(SingleSourcePackage.java:36)
at org.eclipse.osgi.internal.loader.BundleLoader.findClassInternal(BundleLoader.java:391)
at org.eclipse.osgi.internal.loader.BundleLoader.findClass(BundleLoader.java:345)
at org.eclipse.osgi.internal.loader.BundleLoader.findClass(BundleLoader.java:337)
at org.eclipse.osgi.internal.loader.ModuleClassLoader.loadClass(ModuleClassLoader.java:160)
at java.lang.ClassLoader.loadClass(Unknown Source)
at org.eclipse.emf.ecore.plugin.EcorePlugin.getWorkspaceRoot(EcorePlugin.java:1131)
at org.eclipse.emf.ecore.resource.impl.ExtensibleURIConverterImpl.<clinit>(ExtensibleURIConverterImpl.java:393)
at org.eclipse.emf.ecore.resource.impl.ResourceSetImpl.getURIConverter(ResourceSetImpl.java:499)
at org.eclipse.emf.ecore.resource.impl.ResourceSetImpl.getResource(ResourceSetImpl.java:369)
at org.eclipse.e4.ui.internal.workbench.ResourceHandler.getResource(ResourceHandler.java:350)
at org.eclipse.e4.ui.internal.workbench.ResourceHandler.loadResource(ResourceHandler.java:326)
at org.eclipse.e4.ui.internal.workbench.ResourceHandler.loadMostRecentModel(ResourceHandler.java:243)
at org.eclipse.e4.ui.internal.workbench.swt.E4Application.loadApplicationModel(E4Application.java:394)
at org.eclipse.e4.ui.internal.workbench.swt.E4Application.createE4Workbench(E4Application.java:248)
at org.eclipse.e4.ui.internal.workbench.swt.E4Application.start(E4Application.java:143)
at org.eclipse.equinox.internal.app.EclipseAppHandle.run(EclipseAppHandle.java:196)
at org.eclipse.core.runtime.internal.adaptor.EclipseAppLauncher.runApplication(EclipseAppLauncher.java:134)
at org.eclipse.core.runtime.internal.adaptor.EclipseAppLauncher.start(EclipseAppLauncher.java:104)
at org.eclipse.core.runtime.adaptor.EclipseStarter.run(EclipseStarter.java:380)
at org.eclipse.core.runtime.adaptor.EclipseStarter.run(EclipseStarter.java:235)
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:648)
at org.eclipse.equinox.launcher.Main.basicRun(Main.java:603)
at org.eclipse.equinox.launcher.Main.run(Main.java:1465)
at org.eclipse.equinox.launcher.Main.main(Main.java:1438)

!ENTRY org.eclipse.osgi 4 0 2015-01-12 00:02:40.687
!MESSAGE Application error
!STACK 1
java.lang.NoClassDefFoundError: org/eclipse/core/resources/ResourcesPlugin
at org.eclipse.emf.ecore.plugin.EcorePlugin.getWorkspaceRoot(EcorePlugin.java:1131)
at org.eclipse.emf.ecore.resource.impl.ExtensibleURIConverterImpl.<clinit>(ExtensibleURIConverterImpl.java:393)
at org.eclipse.emf.ecore.resource.impl.ResourceSetImpl.getURIConverter(ResourceSetImpl.java:499)
at org.eclipse.emf.ecore.resource.impl.ResourceSetImpl.getResource(ResourceSetImpl.java:369)
at org.eclipse.e4.ui.internal.workbench.ResourceHandler.getResource(ResourceHandler.java:350)
at org.eclipse.e4.ui.internal.workbench.ResourceHandler.loadResource(ResourceHandler.java:326)
at org.eclipse.e4.ui.internal.workbench.ResourceHandler.loadMostRecentModel(ResourceHandler.java:243)
at org.eclipse.e4.ui.internal.workbench.swt.E4Application.loadApplicationModel(E4Application.java:394)
at org.eclipse.e4.ui.internal.workbench.swt.E4Application.createE4Workbench(E4Application.java:248)
at org.eclipse.e4.ui.internal.workbench.swt.E4Application.start(E4Application.java:143)
at org.eclipse.equinox.internal.app.EclipseAppHandle.run(EclipseAppHandle.java:196)
at org.eclipse.core.runtime.internal.adaptor.EclipseAppLauncher.runApplication(EclipseAppLauncher.java:134)
at org.eclipse.core.runtime.internal.adaptor.EclipseAppLauncher.start(EclipseAppLauncher.java:104)
at org.eclipse.core.runtime.adaptor.EclipseStarter.run(EclipseStarter.java:380)
at org.eclipse.core.runtime.adaptor.EclipseStarter.run(EclipseStarter.java:235)
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:648)
at org.eclipse.equinox.launcher.Main.basicRun(Main.java:603)
at org.eclipse.equinox.launcher.Main.run(Main.java:1465)
at org.eclipse.equinox.launcher.Main.main(Main.java:1438)
Caused by: java.lang.ClassNotFoundException: An error occurred while automatically activating bundle org.eclipse.core.resources (18).
at org.eclipse.osgi.internal.hooks.EclipseLazyStarter.postFindLocalClass(EclipseLazyStarter.java:116)
at org.eclipse.osgi.internal.loader.classpath.ClasspathManager.findLocalClass(ClasspathManager.java:531)
at org.eclipse.osgi.internal.loader.ModuleClassLoader.findLocalClass(ModuleClassLoader.java:324)
at org.eclipse.osgi.internal.loader.BundleLoader.findLocalClass(BundleLoader.java:320)
at org.eclipse.osgi.internal.loader.sources.SingleSourcePackage.loadClass(SingleSourcePackage.java:36)
at org.eclipse.osgi.internal.loader.BundleLoader.findClassInternal(BundleLoader.java:391)
at org.eclipse.osgi.internal.loader.BundleLoader.findClass(BundleLoader.java:345)
at org.eclipse.osgi.internal.loader.BundleLoader.findClass(BundleLoader.java:337)
at org.eclipse.osgi.internal.loader.ModuleClassLoader.loadClass(ModuleClassLoader.java:160)
at java.lang.ClassLoader.loadClass(Unknown Source)
... 23 more
Caused by: org.osgi.framework.BundleException: Exception in org.eclipse.core.resources.ResourcesPlugin.start() of bundle org.eclipse.core.resources.
at org.eclipse.osgi.internal.framework.BundleContextImpl.startActivator(BundleContextImpl.java:792)
at org.eclipse.osgi.internal.framework.BundleContextImpl.start(BundleContextImpl.java:721)
at org.eclipse.osgi.internal.framework.EquinoxBundle.startWorker0(EquinoxBundle.java:941)
at org.eclipse.osgi.internal.framework.EquinoxBundle$EquinoxModule.startWorker(EquinoxBundle.java:318)
at org.eclipse.osgi.container.Module.doStart(Module.java:571)
at org.eclipse.osgi.container.Module.start(Module.java:439)
at org.eclipse.osgi.framework.util.SecureAction.start(SecureAction.java:454)
at org.eclipse.osgi.internal.hooks.EclipseLazyStarter.postFindLocalClass(EclipseLazyStarter.java:107)
... 32 more
Caused by: java.lang.NullPointerException
at org.eclipse.core.internal.resources.CharsetDeltaJob.startup(CharsetDeltaJob.java:206)
at org.eclipse.core.internal.resources.CharsetManager.startup(CharsetManager.java:502)
at org.eclipse.core.internal.resources.Workspace.startup(Workspace.java:2468)
at org.eclipse.core.internal.resources.Workspace.open(Workspace.java:2219)
at org.eclipse.core.resources.ResourcesPlugin.start(ResourcesPlugin.java:463)
at org.eclipse.osgi.internal.framework.BundleContextImpl$3.run(BundleContextImpl.java:771)
at org.eclipse.osgi.internal.framework.BundleContextImpl$3.run(BundleContextImpl.java:1)
at java.security.AccessController.doPrivileged(Native Method)
at org.eclipse.osgi.internal.framework.BundleContextImpl.startActivator(BundleContextImpl.java:764)
... 39 more

Answer 1

我在构建最小的捆绑包以使用org.eclipse.jdt.core.JavaCodeFormatter Eclipse 应用程序时遇到了同样的问题。 NPE是由Platform.getContentTypeManager()引起的，此时org.eclipse.core.runtime.content.IContentTypeManager服务不可用。

确保您拥有以下捆绑包：

osgi.bundles=\
org.apache.felix.scr@2:start,\
org.eclipse.core.runtime@start,\
org.eclipse.core.contenttype
# other bundle dependencies

Apache Felix SCR 包必须从运行级别 2 开始，以便 Eclipse 内容机制可以注册其服务，这是核心资源管理包所必需的。

Answer 2

纯 e4 应用程序（使用 Application.e4xmi 的应用程序）不能使用很多旧的 Eclipse 3.x 兼容性代码。在这种情况下，您似乎包含了 org.eclipse.core.resources 插件（或者可能是 Eclipse 错误地自动添加了它们）。

在使用 xxx.product 文件构建 RCP 时，如果您使用“基于功能”的构建，则只需指定功能即可：

<your feature>
org.eclipse.e4.rcp
org.eclipse.emf.common
org.eclipse.emf.core

这将确保构建只使用 e4 插件。

可以使用其他一些Eclipse插件，例如：

org.eclipse.jface.text
org.eclipse.text

基本上你必须查看插件的依赖关系，看看是否使用了不起作用的插件，例如org.eclipse.core.resources 或任何org.eclipse.ui.* 插件。