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在这一点上，我觉得我已经完成了我应该做的所有事情来运行Lucene-Appengine。仍然我得到以下堆栈跟踪。java.lang.NoClassDefFoundError：无法初始化类com.googlecode.luceneappengine.GaeDirectory
由于故障排除，我已经附加，然后将Eclipse和javadoc都移除到eclipse中的luceneappengine-2.2.0.jar的二进制文件中。这意味着我有（然后不是）三个罐子：luceneappengine-2.2.0.jar,luceneappengine-2.2.0-sources.jar和luceneappengine-2.2.0-javadoc.jar。在任何情况下，它都没有区别
另一方面：为什么当代码编译好的时候，我在运行时为com.googlecode.luceneappengine.GaeDirectory获取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)
看起来这是一个预期的错误。在'GaeDirectory'的文档中，它说：“如果您的应用程序在使用GaeDirectory以使其工作时抛出NoClassDefFoundError，那么您的GAE Web应用程序，名为org.apache.lucene.util的软件包中的修改过的RamUsageEstimator”。现在，我不知道你需要做什么修改。所以也许别人可以帮助。但**显然错误是预期的**。 –
我从来没有注意到这一点。但我也不知道如何修改课程。有谁知道我需要改变什么？ –
希望看到显示预期错误的报价的人：http://maven-site.lucene-appengine.googlecode.com/hg/apidocs/com/googlecode/lucene/appengine/GaeDirectory.html –