NoClassDefFoundError：运行 GWT 时的 GuiceServletContextListener +来自 Eclipse 的 GAE
当尝试从 Eclipse 将我的项目作为 WebApplication 运行时，出现以下错误：
[WARN] failed com.google.apphosting.utils.jetty.DevAppEngineWebAppContext@4b903fd{/,D:\Dev\Projects\The Five Orbs\trunk\target\fiveorbs-0.1}: java.lang.NoClassDefFoundError: com/google/inject/servlet/GuiceServletContextListener
[WARN] failed JettyContainerService$ApiProxyHandler@eb4d977: java.lang.NoClassDefFoundError: com/google/inject/servlet/GuiceServletContextListener
[WARN] Error starting handlers
java.lang.NoClassDefFoundError: com/google/inject/servlet/GuiceServletContextListener
尽管可以在编译时找到该类（我的自定义 GuiceServletConfig 扩展了 GuiceServletContextListener 并正确编译）。
guice-servlet-3.0.jar 库同时出现在项目构建路径和 Eclipse 中 Web 应用程序运行配置的类路径中。
我的运行配置的参数面板具有以下配置： 在程序参数中：
-remoteUI "${gwt_remote_ui_server_port}:${unique_id}" -startupUrl TheFiveOrbs.jsp -logLevel INFO -server com.google.appengine.tools.development.gwt.AppEngineLauncher -port 8888 -codeServerPort 9997 -war "D:\Dev\Projects\The Five Orbs\trunk\target\fiveorbs-0.1" com.fiveorbs.TheFiveOrbs
在虚拟机参数中：
-javaagent:D:\Dev\Programs\appengine-java-sdk\lib\agent\appengine-agent.jar -Xmx512m -Dappengine.sdk.root=D:\Dev\Programs\appengine-java-sdk
当我使用 Maven 从命令提示符运行 mvn gae:run 时，一切都很好 - 服务器正常启动并且没有显示任何异常。
我已经在这个问题上苦苦挣扎了几个小时，真的无法理解为什么会发生。
预先感谢您提供的任何提示。
塞巴斯蒂安
When trying to run my project as a WebApplication from Eclipse, I have the following error:
[WARN] failed com.google.apphosting.utils.jetty.DevAppEngineWebAppContext@4b903fd{/,D:\Dev\Projects\The Five Orbs\trunk\target\fiveorbs-0.1}: java.lang.NoClassDefFoundError: com/google/inject/servlet/GuiceServletContextListener
[WARN] failed JettyContainerService$ApiProxyHandler@eb4d977: java.lang.NoClassDefFoundError: com/google/inject/servlet/GuiceServletContextListener
[WARN] Error starting handlers
java.lang.NoClassDefFoundError: com/google/inject/servlet/GuiceServletContextListener
The class can be found at compile time though (my custom GuiceServletConfig extends GuiceServletContextListener and compiles properly).
The guice-servlet-3.0.jar library appears both in the project build path and in the classpath of my Web Application Run Configuration in Eclipse.
The Arguments panel of my Run Configuration has the following config:
in Program arguments:
-remoteUI "${gwt_remote_ui_server_port}:${unique_id}" -startupUrl TheFiveOrbs.jsp -logLevel INFO -server com.google.appengine.tools.development.gwt.AppEngineLauncher -port 8888 -codeServerPort 9997 -war "D:\Dev\Projects\The Five Orbs\trunk\target\fiveorbs-0.1" com.fiveorbs.TheFiveOrbs
in VM arguments:
-javaagent:D:\Dev\Programs\appengine-java-sdk\lib\agent\appengine-agent.jar -Xmx512m -Dappengine.sdk.root=D:\Dev\Programs\appengine-java-sdk
When I run mvn gae:run from the command prompt with Maven, everything is fine though - the server starts properly and no exception is shown.
I have been struggling with this issue for a couple of hours, and really cannot fathom why it occurs.
Thanks in advance for any hint you might be able to offer.
Sébastien
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guice-servlet-3.0.jar不应该位于您的启动配置类路径中，它应该位于您的D:\Dev\Projects\The Five Orbs\trunk 中\target\ Fiveorbs-0.1\WEB-INF\lib文件夹。guice-servlet-3.0.jarshould not be in you launch configuration classpath, it should live in yourD:\Dev\Projects\The Five Orbs\trunk\target\fiveorbs-0.1\WEB-INF\libfolder.