eclipse - 使用 gwt 插件构建 eclipse 项目时出现问题

Question

每次在 java 文件中保存某些内容时，我都会遇到问题。我知道错误消息来自 gwt 插件。

java.lang.NoClassDefFoundError: com/google/gdt/eclipse/suite/preferences/GdtPreferences
at com.google.gdt.eclipse.suite.ext.update.FeatureUpdateManager.checkForUpdates(FeatureUpdateManager.java:105)
at com.google.gdt.eclipse.suite.ext.builders.UpdateTriggerCompilationParticipant.isActive(UpdateTriggerCompilationParticipant.java:40)
at org.eclipse.jdt.internal.core.JavaModelManager$CompilationParticipants.getCompilationParticipants(JavaModelManager.java:339)
at org.eclipse.jdt.internal.core.builder.JavaBuilder.initializeBuilder(JavaBuilder.java:587)
at org.eclipse.jdt.internal.core.builder.JavaBuilder.build(JavaBuilder.java:167)
at org.eclipse.core.internal.events.BuildManager$2.run(BuildManager.java:733)
at org.eclipse.core.runtime.SafeRunner.run(SafeRunner.java:42)
at org.eclipse.core.internal.events.BuildManager.basicBuild(BuildManager.java:206)
at org.eclipse.core.internal.events.BuildManager.basicBuild(BuildManager.java:246)
at org.eclipse.core.internal.events.BuildManager$1.run(BuildManager.java:299)
at org.eclipse.core.runtime.SafeRunner.run(SafeRunner.java:42)
at org.eclipse.core.internal.events.BuildManager.basicBuild(BuildManager.java:302)
at org.eclipse.core.internal.events.BuildManager.basicBuildLoop(BuildManager.java:358)
at org.eclipse.core.internal.events.BuildManager.build(BuildManager.java:381)
at org.eclipse.core.internal.events.AutoBuildJob.doBuild(AutoBuildJob.java:143)
at org.eclipse.core.internal.events.AutoBuildJob.run(AutoBuildJob.java:241)
at org.eclipse.core.internal.jobs.Worker.run(Worker.java:53)

Answer 1

对我来说，选项 -clean 并没有在每种情况下都有帮助，尽管使用了多次。我发现在我的例子中，NoClassDefError 的根本原因是 NullPointerException:

java.lang.NoClassDefFoundError: com/google/gdt/eclipse/suite/preferences/GdtPreferences
    at com.google.gdt.eclipse.suite.ext.update.FeatureUpdateManager.checkForUpdates(FeatureUpdateManager.java:105)
[...]
Caused by: java.lang.NullPointerException
    at com.google.gdt.eclipse.core.markers.GdtProblemSeverities.loadSeverities(GdtProblemSeverities.java:144)

当它发生在一个工作区中时，它也会发生在每个工作区中，因此我查看了 Eclipse“安装”。有一个名为

的文件

configuration/.settings/com.google.gdt.eclipse.suite.prefs

它是这样的一行:

problemSeverities=com.google.gwt.eclipse.core.validators.rpc.RemoteServiceProblemType\#305\=1

删除该链接后，我的 Eclipse 启动没有问题...但是在 Window/Preferences/Google 中修改了设置...我还没有找到如何在要解析的文件中指定这些严重性设置而不出现异常。