Twitter4j Google App Engine - java.lang.NoClassDefFoundError

我试图在Google App Engine上使用Twitter4j库创建Java应用程序。Twitter4j Google App Engine - java.lang.NoClassDefFoundError

当我创建正常（不适用于谷歌）应用程序时，我可以使用twitter4j，一切正常。我在项目 - >属性 - > Java构建路径 - >库 - >添加外部JAR中包含库。我的代码：

Twitter twitter = new TwitterFactory().getInstance(); 
    twitter.setOAuthConsumer(consumer_key, consumer_secret); 
    twitter.setOAuthAccessToken(new AccessToken(oauth_token,oauth_token_secret)); 

    try{ 
     ResponseList<Status> a = twitter.getUserTimeline("medium"); 
     for(Status b:a) 
     { 
      System.out.println(b.getText()); 
     } 
    } 
    catch(Exception e) 
    { 
     System.out.println(e.toString()); 
    }

当我创建谷歌的Java项目，并尝试初始化Twitter的我得到错误：

java.lang.NoClassDefFoundError: twitter4j/TwitterFactory 
at com.paperbox.HelloWorldServlet.doGet(HelloWorldServlet.java:26) 
at javax.servlet.http.HttpServlet.service(HttpServlet.java:617) 
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$CachedChain.doFilter(ServletHandler.java:1166) 
at com.google.appengine.api.socket.dev.DevSocketFilter.doFilter(DevSocketFilter.java:74) 
at org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1157) 
at com.google.appengine.tools.development.ResponseRewriterFilter.doFilter(ResponseRewriterFilter.java:123) 
at org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1157) 
at com.google.appengine.tools.development.HeaderVerificationFilter.doFilter(HeaderVerificationFilter.java:34) 
at org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1157) 
at com.google.appengine.api.blobstore.dev.ServeBlobFilter.doFilter(ServeBlobFilter.java:63) 
at org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1157) 
at com.google.apphosting.utils.servlet.TransactionCleanupFilter.doFilter(TransactionCleanupFilter.java:43) 
at org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1157) 
at com.google.appengine.tools.development.StaticFileFilter.doFilter(StaticFileFilter.java:125) 
at org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1157) 
at com.google.appengine.tools.development.DevAppServerModulesFilter.doDirectRequest(DevAppServerModulesFilter.java:368) 
at com.google.appengine.tools.development.DevAppServerModulesFilter.doDirectModuleRequest(DevAppServerModulesFilter.java:351) 
at com.google.appengine.tools.development.DevAppServerModulesFilter.doFilter(DevAppServerModulesFilter.java:116) 
at org.mortbay.jetty.servlet.ServletHandler$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 com.google.appengine.tools.development.DevAppEngineWebAppContext.handle(DevAppEngineWebAppContext.java:97) 
at org.mortbay.jetty.handler.HandlerWrapper.handle(HandlerWrapper.java:152) 
at com.google.appengine.tools.development.JettyContainerService$ApiProxyHandler.handle(JettyContainerService.java:485) 
at org.mortbay.jetty.handler.HandlerWrapper.handle(HandlerWrapper.java:152) 
at org.mortbay.jetty.Server.handle(Server.java:326) 
at org.mortbay.jetty.HttpConnection.handleRequest(HttpConnection.java:542) 
at org.mortbay.jetty.HttpConnection$RequestHandler.headerComplete(HttpConnection.java:923) 
at org.mortbay.jetty.HttpParser.parseNext(HttpParser.java:547) 
at org.mortbay.jetty.HttpParser.parseAvailable(HttpParser.java:212) 
at org.mortbay.jetty.HttpConnection.handle(HttpConnection.java:404) 
at org.mortbay.io.nio.SelectChannelEndPoint.run(SelectChannelEndPoint.java:409) 
at org.mortbay.thread.QueuedThreadPool$PoolThread.run(QueuedThreadPool.java:582)

来源

2013-08-23 Adam Śliwakowski

Twitter4j异步在GAE直接调用new Thread()这是不允许的。

您需要修改DispatcherImpl的构造函数才能使用GAE的ThreadManager来创建您的线程。

请参阅GAE sandbox constratints

来源

2013-08-26 18:50:33 study

Twitter4j的JAR文件应该放在WEB-INF/lib目录下。

来源

2013-08-23 18:29:04 study

经过一些改变后，它的工作原理！ :)你的回复非常有帮助。我不得不重新启动IDE，创建新项目，导入库。 –

我不知道Twitter4j-GAE连接或其他问题是否存在问题。

现在我必须使用异步连接 - 代码：

AsyncTwitterFactory factory = new AsyncTwitterFactory(); 
AsyncTwitter asyncTwitter = factory.getInstance(); 
asyncTwitter.setOAuthConsumer(consumer_key, consumer_secret); 
asyncTwitter.setOAuthAccessToken(new AccessToken(oauth_token,oauth_token_secret)); 
asyncTwitter.addListener(listener); 
//asyncTwitter.updateStatus("asd"); 
System.out.println(asyncTwitter.toString()); 
     try{ 
      asyncTwitter.getUserTimeline("medium"); 
     } 
     catch(Exception e) 
     { 
      System.out.println(e.toString()); 
     }

例外：

HTTP ERROR 500 

Problem accessing /testapp Reason: 

java.lang.reflect.InvocationTargetException 
Caused by: 

java.lang.AssertionError: java.lang.reflect.InvocationTargetException 
at twitter4j.internal.async.DispatcherFactory.getInstance(DispatcherFactory.java:61) 
at twitter4j.AsyncTwitterImpl.getDispatcher(AsyncTwitterImpl.java:3146) 
at twitter4j.AsyncTwitterImpl.getUserTimeline(AsyncTwitterImpl.java:109) 
at twitter4j.AsyncTwitterImpl.getUserTimeline(AsyncTwitterImpl.java:170) 
... 
...

来源

2013-08-24 21:36:20

Twitter4j Google App Engine - java.lang.NoClassDefFoundError

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