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在這一點上，我覺得我已經完成了我應該做的所有事情來運行Lucene-Appengine。仍然我得到以下堆棧跟蹤。java.lang.NoClassDefFoundError：無法初始化類com.googlecode.luceneappengine.GaeDirectory
由於故障排除，我已經附加，然後將Eclipse和javadoc都移除到eclipse中的luceneappengine-2.2.0.jar的二進制文件中。這意味着我有（然後不是）三個罐子：luceneappengine-2.2.0.jar,luceneappengine-2.2.0-sources.jar和luceneappengine-2.2.0-javadoc.jar。在任何情況下，它都沒有區別
另一方面：爲什麼當代碼編譯好的時候，我在運行時爲com.googlecode.luceneappengine.GaeDirectory獲取NoClassDefFoundError？
com.google.api.server.spi.SystemService invokeServiceMethod: exception occurred while calling backed method
java.lang.NoClassDefFoundError: Could not initialize class com.googlecode.luceneappengine.GaeDirectory
at com.company.myproject.mypath.MyClass1.methodB(MyClass1.java:109)
at com.company.myproject.mypath.MyClass.methodA(MyClass.java:1023)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:45)
at com.google.api.server.spi.SystemService.invokeServiceMethod(SystemService.java:359)
at com.google.api.server.spi.SystemServiceServlet.execute(SystemServiceServlet.java:160)
at com.google.api.server.spi.SystemServiceServlet.doPost(SystemServiceServlet.java:118)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:637)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:717)
at org.mortbay.jetty.servlet.ServletHolder.handle(ServletHolder.java:511)
at org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1166)
at com.googlecode.objectify.ObjectifyFilter.doFilter(ObjectifyFilter.java:48)
at org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1157)
at org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1157)
at org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1157)
at org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1157)
at org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1157)
at org.mortbay.jetty.servlet.ServletHandler.handle(ServletHandler.java:388)
at org.mortbay.jetty.security.SecurityHandler.handle(SecurityHandler.java:216)
at org.mortbay.jetty.servlet.SessionHandler.handle(SessionHandler.java:182)
at org.mortbay.jetty.handler.ContextHandler.handle(ContextHandler.java:765)
at org.mortbay.jetty.webapp.WebAppContext.handle(WebAppContext.java:418)
at org.mortbay.jetty.handler.HandlerWrapper.handle(HandlerWrapper.java:152)
at org.mortbay.jetty.Server.handle(Server.java:326)
at org.mortbay.jetty.HttpConnection.handleRequest(HttpConnection.java:542)
at org.mortbay.jetty.HttpConnection$RequestHandler.headerComplete(HttpConnection.java:923)
at org.mortbay.jetty.HttpConnection.handle(HttpConnection.java:404)
at com.google.tracing.TraceContext$TraceContextRunnable.runInContext(TraceContext.java:437)
at com.google.tracing.TraceContext$TraceContextRunnable$1.run(TraceContext.java:444)
at com.google.tracing.CurrentContext.runInContext(CurrentContext.java:220)
at com.google.tracing.TraceContext$AbstractTraceContextCallback.runInInheritedContextNoUnref(TraceContext.java:308)
at com.google.tracing.TraceContext$AbstractTraceContextCallback.runInInheritedContext(TraceContext.java:300)
at com.google.tracing.TraceContext$TraceContextRunnable.run(TraceContext.java:441)
at java.lang.Thread.run(Thread.java:745)
看起來這是一個預期的錯誤。在'GaeDirectory'的文檔中，它說：「如果您的應用程序在使用GaeDirectory以使其工作時拋出NoClassDefFoundError，那麼您的GAE Web應用程序，名爲org.apache.lucene.util的軟件包中的修改過的RamUsageEstimator」。現在，我不知道你需要做什麼修改。所以也許別人可以幫助。但**顯然錯誤是預期的**。 –
我從來沒有注意到這一點。但我也不知道如何修改課程。有誰知道我需要改變什麼？ –
希望看到顯示預期錯誤的報價的人：http://maven-site.lucene-appengine.googlecode.com/hg/apidocs/com/googlecode/lucene/appengine/GaeDirectory.html –