對於使用GoogleAppEngine的RPC，ClassNotFoundException

我試圖將本地工作的應用程序部署到GAE GoogleAppEngine。它已經在那裏運行，除了RPC調用。他們都扔ClassNotFoundException s。對於使用GoogleAppEngine的RPC，ClassNotFoundException

我只是使用下面的代碼完成RPC，可能我已經忘記了一些東西？它在本地devmode中完美工作。

客戶端：

@RemoteServiceRelativePath("test") 
public interface TestService extends RemoteService { 
    String testRpc(); 
} 

public interface TestServiceAsync extends RemoteService { 
    void testRpc(AsyncCallback<String> callback); 
}

用法：

TestServiceAsync service = GWT.create(TestService.class) 
    service.testRpc(new AsyncCallback<String>() { 
     @Override 
     public void onFailure(Throwable caught) { 
      Window.alert("ERROR"); 
     } 

     @Override 
     public void onSuccess(String result) { 
      Window.alert("SUCCESS: " + result); 
     } 
    });

服務器端：

package myapp.server.rpc; 
public class TestServiceImpl extends RemoteServiceServlet implements TestService { 
    @Override 
    public String testRpc() { 
     return "OK"; 
    } 
}

web.xml中：

<servlet> 
     <servlet-name>TestServiceImpl</servlet-name> 
     <servlet-class>myapp.server.rpc.TestServiceImpl 
     </servlet-class> 
    </servlet> 
    <servlet-mapping> 
     <servlet-name>TestServiceImpl</servlet-name> 
     <url-pattern>/myapp/test</url-pattern> 
    </servlet-mapping>

結果：異常：

EXCEPTION 
java.lang.ClassNotFoundException: my.app.server.rpc.TestServiceImpl 
    at com.google.appengine.runtime.Request.process-e7c092c1e216f15a(Request.java) 
    at java.lang.ClassLoader.loadClass(ClassLoader.java:266) 
    at org.mortbay.util.Loader.loadClass(Loader.java:91) 
    at org.mortbay.util.Loader.loadClass(Loader.java:71) 
    at org.mortbay.jetty.servlet.Holder.doStart(Holder.java:73) 
    at org.mortbay.jetty.servlet.ServletHolder.doStart(ServletHolder.java:242) 
    at org.mortbay.component.AbstractLifeCycle.start(AbstractLifeCycle.java:50) 
    at org.mortbay.jetty.servlet.ServletHandler.initialize(ServletHandler.java:685) 
    at org.mortbay.jetty.servlet.Context.startContext(Context.java:140) 
    at org.mortbay.jetty.webapp.WebAppContext.startContext(WebAppContext.java:1250) 
    at org.mortbay.jetty.handler.ContextHandler.doStart(ContextHandler.java:517) 
    at org.mortbay.jetty.webapp.WebAppContext.doStart(WebAppContext.java:467) 
    at org.mortbay.component.AbstractLifeCycle.start(AbstractLifeCycle.java:50) 
    at com.google.tracing.TraceContext$TraceContextRunnable.runInContext(TraceContext.java:480) 
    at com.google.tracing.TraceContext$TraceContextRunnable$1.run(TraceContext.java:487) 
    at com.google.tracing.TraceContext.runInContext(TraceContext.java:774) 
    at com.google.tracing.TraceContext$DoInTraceContext.runInContext(TraceContext.java:751) 
    at com.google.tracing.TraceContext$AbstractTraceContextCallback.runInInheritedContextNoUnref(TraceContext.java:342) 
    at com.google.tracing.TraceContext$AbstractTraceContextCallback.runInInheritedContext(TraceContext.java:334) 
    at com.google.tracing.TraceContext$TraceContextRunnable.run(TraceContext.java:484) 
    at java.lang.Thread.run(Thread.java:679) 

E 2013-04-23 11:03:08.915 

javax.servlet.ServletContext log: unavailable 
javax.servlet.UnavailableException: my.app.server.rpc.TestServiceImpl 
    at org.mortbay.jetty.servlet.Holder.doStart(Holder.java:79) 
    at org.mortbay.jetty.servlet.ServletHolder.doStart(ServletHolder.java:242) 
    at org.mortbay.component.AbstractLifeCycle.start(AbstractLifeCycle.java:50) 
    at org.mortbay.jetty.servlet.ServletHandler.initialize(ServletHandler.java:685) 
    at org.mortbay.jetty.servlet.Context.startContext(Context.java:140) 
    at org.mortbay.jetty.webapp.WebAppContext.startContext(WebAppContext.java:1250) 
    at org.mortbay.jetty.handler.ContextHandler.doStart(ContextHandler.java:517) 
    at org.mortbay.jetty.webapp.WebAppContext.doStart(WebAppContext.java:467) 
    at org.mortbay.component.AbstractLifeCycle.start(AbstractLifeCycle.java:50) 
    at com.google.apphosting.runtime.jetty.AppVersionHandlerMap.createHandler(AppVersionHandlerMap.java:219) 
    at com.google.apphosting.runtime.jetty.AppVersionHandlerMap.getHandler(AppVersionHandlerMap.java:194) 
    at com.google.apphosting.runtime.jetty.JettyServletEngineAdapter.serviceRequest(JettyServletEngineAdapter.java:134) 
    at com.google.apphosting.runtime.JavaRuntime$RequestRunnable.run(JavaRuntime.java:438) 
    at com.google.tracing.TraceContext$TraceContextRunnable.runInContext(TraceContext.java:480) 
    at com.google.tracing.TraceContext$TraceContextRunnable$1.run(TraceContext.java:487) 
    at com.google.tracing.TraceContext.runInContext(TraceContext.java:774) 
    at com.google.tracing.TraceContext$DoInTraceContext.runInContext(TraceContext.java:751) 
    at com.google.tracing.TraceContext$AbstractTraceContextCallback.runInInheritedContextNoUnref(TraceContext.java:342) 
    at com.google.tracing.TraceContext$AbstractTraceContextCallback.runInInheritedContext(TraceContext.java:334) 
    at com.google.tracing.TraceContext$TraceContextRunnable.run(TraceContext.java:484) 
    at com.google.apphosting.runtime.ThreadGroupPool$PoolEntry.run(ThreadGroupPool.java:251) 
    at java.lang.Thread.run(Thread.java:679) 

W 2013-04-23 11:03:08.924 

Failed startup of context [email protected]1079ff{/,/base/data/home/apps/s~myapp/1.366873782202758954} 
org.mortbay.util.MultiException[java.lang.NullPointerException, java.lang.NullPointerException, java.lang.NullPointerException] 
    at org.mortbay.jetty.servlet.ServletHandler.initialize(ServletHandler.java:656) 
    at org.mortbay.jetty.servlet.Context.startContext(Context.java:140) 
    at org.mortbay.jetty.webapp.WebAppContext.startContext(WebAppContext.java:1250) 
    at org.mortbay.jetty.handler.ContextHandler.doStart(ContextHandler.java:517) 
    at org.mortbay.jetty.webapp.WebAppContext.doStart(WebAppContext.java:467) 
    at org.mortbay.component.AbstractLifeCycle.start(AbstractLifeCycle.java:50) 
    at com.google.apphosting.runtime.jetty.AppVersionHandlerMap.createHandler(AppVersionHandlerMap.java:219) 
    at com.google.apphosting.runtime.jetty.AppVersionHandlerMap.getHandler(AppVersionHandlerMap.java:194) 
    at com.google.apphosting.runtime.jetty.JettyServletEngineAdapter.serviceRequest(JettyServletEngineAdapter.java:134) 
    at com.google.apphosting.runtime.JavaRuntime$RequestRunnable.run(JavaRuntime.java:438) 
    at com.google.tracing.TraceContext$TraceContextRunnable.runInContext(TraceContext.java:480) 
    at com.google.tracing.TraceContext$TraceContextRunnable$1.run(TraceContext.java:487) 
    at com.google.tracing.TraceContext.runInContext(TraceContext.java:774) 
    at com.google.tracing.TraceContext$DoInTraceContext.runInContext(TraceContext.java:751) 
    at com.google.tracing.TraceContext$AbstractTraceContextCallback.runInInheritedContextNoUnref(TraceContext.java:342) 
    at com.google.tracing.TraceContext$AbstractTraceContextCallback.runInInheritedContext(TraceContext.java:334) 
    at com.google.tracing.TraceContext$TraceContextRunnable.run(TraceContext.java:484) 
    at com.google.apphosting.runtime.ThreadGroupPool$PoolEntry.run(ThreadGroupPool.java:251) 
    at java.lang.Thread.run(Thread.java:679) 
java.lang.NullPointerException 
    at java.lang.Class.isAssignableFrom(Native Method) 
    at org.mortbay.jetty.servlet.ServletHolder.doStart(ServletHolder.java:256) 
    at org.mortbay.component.AbstractLifeCycle.start(AbstractLifeCycle.java:50) 
    at org.mortbay.jetty.servlet.ServletHandler.initialize(ServletHandler.java:685) 
    at org.mortbay.jetty.servlet.Context.startContext(Context.java:140) 
    at org.mortbay.jetty.webapp.WebAppContext.startContext(WebAppContext.java:1250) 
    at org.mortbay.jetty.handler.ContextHandler.doStart(ContextHandler.java:517) 
    at org.mortbay.jetty.webapp.WebAppContext.doStart(WebAppContext.java:467) 
    at org.mortbay.component.AbstractLifeCycle.start(AbstractLifeCycle.java:50) 
    at com.google.apphosting.runtime.jetty.AppVersionHandlerMap.createHandler(AppVersionHandlerMap.java:219) 
    at com.google.apphosting.runtime.jetty.AppVersionHandlerMap.getHandler(AppVersionHandlerMap.java:194) 
    at com.google.apphosting.runtime.jetty.JettyServletEngineAdapter.serviceRequest(JettyServletEngineAdapter.java:134) 
    at com.google.apphosting.runtime.JavaRuntime$RequestRunnable.run(JavaRuntime.java:438) 
    at com.google.tracing.TraceContext$TraceContextRunnable.runInContext(TraceContext.java:480) 
    at com.google.tracing.TraceContext$TraceContextRunnable$1.run(TraceContext.java:487) 
    at com.google.tracing.TraceContext.runInContext(TraceContext.java:774) 
    at com.google.tracing.TraceContext$DoInTraceContext.runInContext(TraceContext.java:751) 
    at com.google.tracing.TraceContext$AbstractTraceContextCallback.runInInheritedContextNoUnref(TraceContext.java:342) 
    at com.google.tracing.TraceContext$AbstractTraceContextCallback.runInInheritedContext(TraceContext.java:334) 
    at com.google.tracing.TraceContext$TraceContextRunnable.run(TraceContext.java:484) 
    at com.google.apphosting.runtime.ThreadGroupPool$PoolEntry.run(ThreadGroupPool.java:251) 
    at java.lang.Thread.run(Thread.java:679) 
java.lang.NullPointerException 
    at java.lang.Class.isAssignableFrom(Native Method) 
    at org.mortbay.jetty.servlet.ServletHolder.doStart(ServletHolder.java:256) 
    at org.mortbay.component.AbstractLifeCycle.start(AbstractLifeCycle.java:50) 
    at org.mortbay.jetty.servlet.ServletHandler.initialize(ServletHandler.java:685) 
    at org.mortbay.jetty.servlet.Context.startContext(Context.java:140) 
    at org.mortbay.jetty.webapp.WebAppContext.startContext(WebAppContext.java:1250) 
    at org.mortbay.jetty.handler.ContextHandler.doStart(ContextHandler.java:517) 
    at org.mortbay.jetty.webapp.WebAppContext.doStart(WebAppContext.java:467) 
    at org.mortbay.component.AbstractLifeCycle.start(AbstractLifeCycle.java:50) 
    at com.google.apphosting.runtime.jetty.AppVersionHandlerMap.createHandler(AppVersionHandlerMap.java:219) 
    at com.google.apphosting.runtime.jetty.AppVersionHandlerMap.getHandler(AppVersionHandlerMap.java:194) 
    at com.google.apphosting.runtime.jetty.JettyServletEngineAdapter.serviceRequest(JettyServletEngineAdapter.java:134) 
    at com.google.apphosting.runtime.JavaRuntime$RequestRunnable.run(JavaRuntime.java:438) 
    at com.google.tracing.TraceContext$TraceContextRunnable.runInContext(TraceContext.java:480) 
    at com.google.tracing.TraceContext$TraceContextRunnable$1.run(TraceContext.java:487) 
    at com.google.tracing.TraceContext.runInContext(TraceContext.java:774) 
    at com.google.tracing.TraceContext$DoInTraceContext.runInContext(TraceContext.java:751) 
    at com.google.tracing.TraceContext$AbstractTraceContextCallback.runInInheritedContextNoUnref(TraceContext.java:342) 
    at com.google.tracing.TraceContext$AbstractTraceContextCallback.runInInheritedContext(TraceContext.java:334) 
    at com.google.tracing.TraceContext$TraceContextRunnable.run(TraceContext.java:484) 
    at com.google.apphosting.runtime.ThreadGroupPool$PoolEntry.run(ThreadGroupPool.java:251) 
    at java.lang.Thread.run(Thread.java:679) 
java.lang.NullPointerException 
    at java.lang.Class.isAssignableFrom(Native Method) 
    at org.mortbay.jetty.servlet.ServletHolder.doStart(ServletHolder.java:256) 
    at org.mortbay.component.AbstractLifeCycle.start(AbstractLifeCycle.java:50) 
    at org.mortbay.jetty.servlet.ServletHandler.initialize(ServletHandler.java:685) 
    at org.mortbay.jetty.servlet.Context.startContext(Context.java:140) 
    at org.mortbay.jetty.webapp.WebAppContext.startContext(WebAppContext.java:1250) 
    at org.mortbay.jetty.handler.ContextHandler.doStart(ContextHandler.java:517) 
    at org.mortbay.jetty.webapp.WebAppContext.doStart(WebAppContext.java:467) 
    at org.mortbay.component.AbstractLifeCycle.start(AbstractLifeCycle.java:50) 
    at com.google.apphosting.runtime.jetty.AppVersionHandlerMap.createHandler(AppVersionHandlerMap.java:219) 
    at com.google.apphosting.runtime.jetty.AppVersionHandlerMap.getHandler(AppVersionHandlerMap.java:194) 
    at com.google.apphosting.runtime.jetty.JettyServletEngineAdapter.serviceRequest(JettyServletEngineAdapter.java:134) 
    at com.google.apphosting.runtime.JavaRuntime$RequestRunnable.run(JavaRuntime.java:438) 
    at com.google.tracing.TraceContext$TraceContextRunnable.runInContext(TraceContext.java:480) 
    at com.google.tracing.TraceContext$TraceContextRunnable$1.run(TraceContext.java:487) 
    at com.google.tracing.TraceContext.runInContext(TraceContext.java:774) 
    at com.google.tracing.TraceContext$DoInTraceContext.runInContext(TraceContext.java:751) 
    at com.google.tracing.TraceContext$AbstractTraceContextCallback.runInInheritedContextNoUnref(TraceContext.java:342) 
    at com.google.tracing.TraceContext$AbstractTraceContextCallback.runInInheritedContext(TraceContext.java:334) 
    at com.google.tracing.TraceContext$TraceContextRunnable.run(TraceContext.java:484) 
    at com.google.apphosting.runtime.ThreadGroupPool$PoolEntry.run(ThreadGroupPool.java:251) 
    at java.lang.Thread.run(Thread.java:679) 

C 2013-04-23 11:03:08.928 

Uncaught exception from servlet 
javax.servlet.UnavailableException: Initialization failed. 
    at com.google.apphosting.runtime.jetty.AppVersionHandlerMap.createHandler(AppVersionHandlerMap.java:228) 
    at com.google.apphosting.runtime.jetty.AppVersionHandlerMap.getHandler(AppVersionHandlerMap.java:194) 
    at com.google.apphosting.runtime.jetty.JettyServletEngineAdapter.serviceRequest(JettyServletEngineAdapter.java:134) 
    at com.google.apphosting.runtime.JavaRuntime$RequestRunnable.run(JavaRuntime.java:438) 
    at com.google.tracing.TraceContext$TraceContextRunnable.runInContext(TraceContext.java:480) 
    at com.google.tracing.TraceContext$TraceContextRunnable$1.run(TraceContext.java:487) 
    at com.google.tracing.TraceContext.runInContext(TraceContext.java:774) 
    at com.google.tracing.TraceContext$DoInTraceContext.runInContext(TraceContext.java:751) 
    at com.google.tracing.TraceContext$AbstractTraceContextCallback.runInInheritedContextNoUnref(TraceContext.java:342) 
    at com.google.tracing.TraceContext$AbstractTraceContextCallback.runInInheritedContext(TraceContext.java:334) 
    at com.google.tracing.TraceContext$TraceContextRunnable.run(TraceContext.java:484) 
    at com.google.apphosting.runtime.ThreadGroupPool$PoolEntry.run(ThreadGroupPool.java:251) 
    at java.lang.Thread.run(Thread.java:679) 

I 2013-04-23 11:03:08.931 

This request caused a new process to be started for your application, and thus caused your application code to be loaded for the first time. This request may thus take longer and use more CPU than a typical request for your application.

來源

2013-04-23 membersound

你實際上並沒有像這樣創建服務'TestService service = new TestService（）;'right？它應該是TestServiceAsync服務= GWT.create（TestService.class）;' – enrybo 2013-04-23 11:55:53

對不起，是的你是對的，編輯上面。 – membersound 2013-04-23 12:11:05

原來是一個構建/編譯問題。 RCP Servlet未編譯到目標文件夾。我不得不重新創建項目，現在它可以工作。

來源

2013-04-26 08:35:48 membersound

你的web.xml中有不同的包，那麼你已經在你的課堂上提到：

<servlet> 
     <servlet-name>TestServiceImpl</servlet-name> 
     <servlet-class>de.myapp.server.rpc.TestServiceImpl 
     </servlet-class> 
    </servlet>

你的類：

package my.app.server.rpc; 
public class TestServiceImpl extends RemoteServiceServlet implements TestService {

修改web.xml和看看它是否能解決你的問題。

來源

2013-04-23 10:20:33 harsh

抱歉，這只是一個錯字以上。當然包是正確的，否則它不會在本地編譯。 – membersound 2013-04-23 10:28:13

對於使用GoogleAppEngine的RPC，ClassNotFoundException

回答

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