Eclipse 编辑器无法打开

Question

My Eclipse cannot show the editor window.

Error:

Could not open the editor: The editor class could not be instantiated. This usually indicates a missing no-arg constructor or that the editor's class name was mistyped in plugin.xml.

Notes:

• I'm using different Eclipse (and not plug-ins) for C++ and Python - and they work flawlessly, it's just the java eclipse that is causing troubles.
• I've already tried re-installing eclipse, and even reinstalling java. any idea?
• It has no troubles displaying the project file, it's "just" the *.java and *.class files that cannot be opened.

Stack trace

org.eclipse.core.runtime.internal.adaptor.EclipseLazyStarter$TerminatingClassNotFoundException: An error occurred while automatically activating bundle org.eclipse.jdt.ui (150).
    at org.eclipse.core.runtime.internal.adaptor.EclipseLazyStarter.postFindLocalClass(EclipseLazyStarter.java:121)
    at org.eclipse.osgi.baseadaptor.loader.ClasspathManager.findLocalClass(ClasspathManager.java:453)
    at org.eclipse.osgi.internal.baseadaptor.DefaultClassLoader.findLocalClass(DefaultClassLoader.java:216)
    at org.eclipse.osgi.internal.loader.BundleLoader.findLocalClass(BundleLoader.java:393)
    at org.eclipse.osgi.internal.loader.BundleLoader.findClassInternal(BundleLoader.java:469)
    at org.eclipse.osgi.internal.loader.BundleLoader.findClass(BundleLoader.java:422)
    at org.eclipse.osgi.internal.loader.BundleLoader.findClass(BundleLoader.java:410)
    at org.eclipse.osgi.internal.baseadaptor.DefaultClassLoader.loadClass(DefaultClassLoader.java:107)
    at java.lang.ClassLoader.loadClass(Unknown Source)
    at org.eclipse.osgi.internal.loader.BundleLoader.loadClass(BundleLoader.java:338)
    at org.eclipse.osgi.framework.internal.core.BundleHost.loadClass(BundleHost.java:232)
    at org.eclipse.osgi.framework.internal.core.AbstractBundle.loadClass(AbstractBundle.java:1197)
    at org.eclipse.core.internal.registry.osgi.RegistryStrategyOSGI.createExecutableExtension(RegistryStrategyOSGI.java:174)
    at org.eclipse.core.internal.registry.ExtensionRegistry.createExecutableExtension(ExtensionRegistry.java:904)
    at org.eclipse.core.internal.registry.ConfigurationElement.createExecutableExtension(ConfigurationElement.java:243)
    at org.eclipse.core.internal.registry.ConfigurationElementHandle.createExecutableExtension(ConfigurationElementHandle.java:55)
    at org.eclipse.ui.internal.WorkbenchPlugin$1.run(WorkbenchPlugin.java:267)
    at org.eclipse.swt.custom.BusyIndicator.showWhile(BusyIndicator.java:70)
    at org.eclipse.ui.internal.WorkbenchPlugin.createExtension(WorkbenchPlugin.java:263)
    at org.eclipse.ui.internal.registry.EditorDescriptor.createEditor(EditorDescriptor.java:235)
    at org.eclipse.ui.internal.EditorManager.createPart(EditorManager.java:845)
    at org.eclipse.ui.internal.EditorReference.createPartHelper(EditorReference.java:609)
    at org.eclipse.ui.internal.EditorReference.createPart(EditorReference.java:465)
    at org.eclipse.ui.internal.WorkbenchPartReference.getPart(WorkbenchPartReference.java:595)
    at org.eclipse.ui.internal.EditorAreaHelper.setVisibleEditor(EditorAreaHelper.java:271)
    at org.eclipse.ui.internal.EditorManager.setVisibleEditor(EditorManager.java:1429)
    at org.eclipse.ui.internal.EditorManager$5.runWithException(EditorManager.java:942)
    at org.eclipse.ui.internal.StartupThreading$StartupRunnable.run(StartupThreading.java:31)
    at org.eclipse.swt.widgets.RunnableLock.run(RunnableLock.java:35)
    at org.eclipse.swt.widgets.Synchronizer.runAsyncMessages(Synchronizer.java:134)
    at org.eclipse.swt.widgets.Display.runAsyncMessages(Display.java:4041)
    at org.eclipse.swt.widgets.Display.readAndDispatch(Display.java:3660)
    at org.eclipse.ui.application.WorkbenchAdvisor.openWindows(WorkbenchAdvisor.java:803)
    at org.eclipse.ui.internal.Workbench$31.runWithException(Workbench.java:1567)
    at org.eclipse.ui.internal.StartupThreading$StartupRunnable.run(StartupThreading.java:31)
    at org.eclipse.swt.widgets.RunnableLock.run(RunnableLock.java:35)
    at org.eclipse.swt.widgets.Synchronizer.runAsyncMessages(Synchronizer.java:134)
    at org.eclipse.swt.widgets.Display.runAsyncMessages(Display.java:4041)
    at org.eclipse.swt.widgets.Display.readAndDispatch(Display.java:3660)
    at org.eclipse.ui.internal.Workbench.runUI(Workbench.java:2548)
    at org.eclipse.ui.internal.Workbench.access$4(Workbench.java:2438)
    at org.eclipse.ui.internal.Workbench$7.run(Workbench.java:671)
    at org.eclipse.core.databinding.observable.Realm.runWithDefault(Realm.java:332)
    at org.eclipse.ui.internal.Workbench.createAndRunWorkbench(Workbench.java:664)
    at org.eclipse.ui.PlatformUI.createAndRunWorkbench(PlatformUI.java:149)
    at org.eclipse.ui.internal.ide.application.IDEApplication.start(IDEApplication.java:115)
    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:369)
    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:620)
    at org.eclipse.equinox.launcher.Main.basicRun(Main.java:575)
    at org.eclipse.equinox.launcher.Main.run(Main.java:1408)
Caused by: org.osgi.framework.BundleException: The activator org.eclipse.jdt.internal.ui.JavaPlugin for bundle org.eclipse.jdt.ui is invalid
    at org.eclipse.osgi.framework.internal.core.AbstractBundle.loadBundleActivator(AbstractBundle.java:156)
    at org.eclipse.osgi.framework.internal.core.BundleContextImpl.start(BundleContextImpl.java:751)
    at org.eclipse.osgi.framework.internal.core.BundleHost.startWorker(BundleHost.java:370)
    at org.eclipse.osgi.framework.internal.core.AbstractBundle.start(AbstractBundle.java:284)
    at org.eclipse.osgi.framework.util.SecureAction.start(SecureAction.java:417)
    at org.eclipse.osgi.internal.loader.BundleLoader.setLazyTrigger(BundleLoader.java:265)
    at org.eclipse.core.runtime.internal.adaptor.EclipseLazyStarter.postFindLocalClass(EclipseLazyStarter.java:106)
    ... 57 more
Caused by: java.lang.NoClassDefFoundError: org/eclipse/jdt/core/IBufferFactory
    at java.lang.Class.getDeclaredConstructors0(Native Method)
    at java.lang.Class.privateGetDeclaredConstructors(Unknown Source)
    at java.lang.Class.getConstructor0(Unknown Source)
    at java.lang.Class.newInstance0(Unknown Source)
    at java.lang.Class.newInstance(Unknown Source)
    at org.eclipse.osgi.framework.internal.core.AbstractBundle.loadBundleActivator(AbstractBundle.java:151)
    ... 63 more
Caused by: org.eclipse.core.runtime.internal.adaptor.EclipseLazyStarter$TerminatingClassNotFoundException: An error occurred while automatically activating bundle org.eclipse.jdt.core (140).
    at org.eclipse.core.runtime.internal.adaptor.EclipseLazyStarter.postFindLocalClass(EclipseLazyStarter.java:121)
    at org.eclipse.osgi.baseadaptor.loader.ClasspathManager.findLocalClass(ClasspathManager.java:453)
    at org.eclipse.osgi.internal.baseadaptor.DefaultClassLoader.findLocalClass(DefaultClassLoader.java:216)
    at org.eclipse.osgi.internal.loader.BundleLoader.findLocalClass(BundleLoader.java:393)
    at org.eclipse.osgi.internal.loader.SingleSourcePackage.loadClass(SingleSourcePackage.java:33)
    at org.eclipse.osgi.internal.loader.BundleLoader.findClassInternal(BundleLoader.java:466)
    at org.eclipse.osgi.internal.loader.BundleLoader.findClass(BundleLoader.java:422)
    at org.eclipse.osgi.internal.loader.BundleLoader.findClass(BundleLoader.java:410)
    at org.eclipse.osgi.internal.baseadaptor.DefaultClassLoader.loadClass(DefaultClassLoader.java:107)
    at java.lang.ClassLoader.loadClass(Unknown Source)
    ... 69 more
Caused by: org.osgi.framework.BundleException: Exception in org.eclipse.jdt.core.JavaCore.start() of bundle org.eclipse.jdt.core.
    at org.eclipse.osgi.framework.internal.core.BundleContextImpl.startActivator(BundleContextImpl.java:806)
    at org.eclipse.osgi.framework.internal.core.BundleContextImpl.start(BundleContextImpl.java:755)
    at org.eclipse.osgi.framework.internal.core.BundleHost.startWorker(BundleHost.java:370)
    at org.eclipse.osgi.framework.internal.core.AbstractBundle.start(AbstractBundle.java:284)
    at org.eclipse.osgi.framework.util.SecureAction.start(SecureAction.java:417)
    at org.eclipse.osgi.internal.loader.BundleLoader.setLazyTrigger(BundleLoader.java:265)
    at org.eclipse.core.runtime.internal.adaptor.EclipseLazyStarter.postFindLocalClass(EclipseLazyStarter.java:106)
    ... 78 more
Caused by: java.lang.NullPointerException
    at org.eclipse.core.runtime.Path.<init>(Path.java:183)
    at org.eclipse.core.internal.resources.WorkspaceRoot.getProject(WorkspaceRoot.java:181)
    at org.eclipse.jdt.internal.core.ExternalFoldersManager.isExternalFolderPath(ExternalFoldersManager.java:90)
    at org.eclipse.jdt.internal.core.JavaProject.addToResult(JavaProject.java:2738)
    at org.eclipse.jdt.internal.core.JavaProject.resolveClasspath(JavaProject.java:2688)
    at org.eclipse.jdt.internal.core.JavaProject.resolveClasspath(JavaProject.java:2783)
    at org.eclipse.jdt.internal.core.DeltaProcessingState.getRootInfos(DeltaProcessingState.java:301)
    at org.eclipse.jdt.internal.core.DeltaProcessingState.initializeRootsWithPreviousSession(DeltaProcessingState.java:271)
    at org.eclipse.jdt.internal.core.JavaModelManager.startup(JavaModelManager.java:4712)
    at org.eclipse.jdt.core.JavaCore.start(JavaCore.java:5048)
    at org.eclipse.osgi.framework.internal.core.BundleContextImpl$1.run(BundleContextImpl.java:783)
    at java.security.AccessController.doPrivileged(Native Method)
    at org.eclipse.osgi.framework.internal.core.BundleContextImpl.startActivator(BundleContextImpl.java:774)
    ... 84 more

EDIT:

eclipse version: 3.6.2
eclipse.ini file:

-startup
plugins/org.eclipse.equinox.launcher_1.1.1.R36x_v20101122_1400.jar
--launcher.library
plugins/org.eclipse.equinox.launcher.win32.win32.x86_1.1.2.R36x_v20101222
-product
org.eclipse.epp.package.java.product
--launcher.defaultAction
openFile
--launcher.XXMaxPermSize
256M
-showsplash
org.eclipse.platform
--launcher.XXMaxPermSize
256m
--launcher.defaultAction
openFile
-vmargs
-Dosgi.requiredJavaVersion=1.5
-Xms40m
-Xmx384m

EDIT 2:
I changed the workspace and it fixed the problem (for the new workspace at least) but still - no idea why it happened. (though I am still curious, so I leave this question open).

Answer 1

This is often a problem with temporary files saved by eclipse plugins. Check YOUR_WORKSPACE/.metadata/.plugins/org.eclipse.jdt.core/ . There are a lot of index files. Sometimes it helps to delete them. Also, start your eclipse with -clean .

But I think your problem is slightly different. Did you have a reference to a library(jar-file) somewhere in your filesystem? If you deleted it or moved it, eclipse can't build your projects.

Did you refresh all your projects?

Answer 2

I've got the same problem though my eclipse is much newer - 4.2 (Juno). For me the solution was to remove <workspace>/.metadata/.plugins/org.eclipse.core.resources/.snap . Afterwards I found this bug in eclipse.org: Bug 178988 - Crash at startup due to ".snap" files .

Hope this will help somebody.

Answer 3

at org.eclipse.core.runtime.Path.<init>(Path.java:183)
at org.eclipse.core.internal.resources.WorkspaceRoot.getProject(WorkspaceRoot.java:181)
at org.eclipse.jdt.internal.core.ExternalFoldersManager.isExternalFolderPath(ExternalFoldersManager.java:90)
at org.eclipse.jdt.internal.core.JavaProject.addToResult(JavaProject.java:2738)
at org.eclipse.jdt.internal.core.JavaProject.resolveClasspath(JavaProject.java:2688)

The stack trace seem to indicate that there is a problem with your classpath.

1. Maybe your JRE is pointing to an invalid location / isn't defined? (Window->Preferences->Java->Installed JREs).
2. Maybe your project contains invalid class path entries? Try to create a new java project and check if that is working as expected. If it works check the classpath of your not working project.

Edit: Another Idea ... launch eclipse on an other workspace. Then create a launch configuration for an "Eclipse Configuration" with the workspace that produces an error. Set a java exception breakpoint for NullPointerException. Start in debug mode and you can inspect the variables to see which path produces the problems.

Answer 4

Google this error and you get plenty of hits in a variety of (Eclipse) IDE's and plugins. There seems to be no record of real 'fix' though, besides the one you found out where you create a new workspace.

3.6.2.r362_v20110210 is the version I'm running. Are you sure you're on 3.6.2? You're first edit lists

-startup plugins/org.eclipse.equinox.launcher_1.1.1.R36x_v20101122_1400.jar --launcher.library plugins/org.eclipse.equinox.launcher.win32.win32.x86_1.1.2. R36x_v20101222

which seems to point at an older release.

I agree with another poster that you should definitely search and/or post this on Eclipse's bugtracking system. That's the least you can do when you use open source software.

Answer 5

I tried a couple of options

1. delete cache files within .plugins
2. delete all index files in <workspace>/.metadata/.plugins/org.eclipse.jdt.core
3. delete snap file in <workspace>/.metadata/.plugins/org.eclipse.core.resources/.snap
4. -clean as a start up parameter
5. -initialize as a start up parameter

But I keep getting the error back randomly.

So far, the only option that worked consistently is removing the .snap file, the first time we launch eclipse after removing .snap file it works fine.

Also any time we launch it in a new workspace; it works fine. but we would hate to switch the workspace for this reason.

Moreover if we close and relaunch eclipse the issue comes back randomly.

Answer 6

I was getting this for FlashBuilder 4.7. It was a permissions issue. On Mac OSX, from the info box, I gave my user READ & WRITE access to Flash Builder 4.7 folder, then did "Apply to enclosed items..." and that fixed it.

Answer 7

The solution to the above problem is to go to workspace.metadata.plugins\\org.eclipse.jdt.core & remove all the index files.

Thanks FlorianOver

Answer 8

有同样的问题（在 Indigo 3.7 上）并获得正确版本的 jadclipse jar（net.sf.jadclipse_3.3.0.jar with Jad 1.5.8g）为我做了

Answer 9

Removing the index files as suggested by others didn't help in my case. I had to reset the perspective: right-click the "Java" perspective toggle button in the upper right corner, choose "Reset". At least it's better than recreating the entire workspace.

Answer 10

对我来说，它可以删除 workspace/.metadate/.lock 然后使用 eclispe -clean -refresh 重新启动

Answer 11

Here was simple. Right-click in the class and choose the / open with / Java Editor, or Generic Text Editor option.

Aqui foi simples. Clique na classe com o botão direito e escolha a opção / open com / Editor Java, ou Editor de Texto Genérico.

Answer 12

When I faced this issue. I simple updated the eclipse and it resolve the problem.

Answer 13

A solution which worked for me (after first unsuccessfully trying the other more accurate steps listed above) was to do as below:

1. Close Eclipse and delete all the contents of {Workspace}.metadata.plugins folder.
2. Open Eclipse. It does not show any projects.
3. Import the projects into the workspace by going to the File menu, clicking import and continuing with steps.

The issue gets resolved this way. However, a drawback is that you have to import the projects again after the steps.

Answer 14

I faced the same issue. It was basically caused by a version mismatch of the jadclipse jar. Initially I had jadclipse_3.2.1.jar but then I updated to net.sf.jadclipse_3.3.0.jar . Resolved the issue.