Sporadic error with GWT and GAE

Dear all,

I have developed an application in GWT that is running on GAE and I am receiving sporadic error like the one that I have reported in this post.

The problem is that from the stack trace I cannot figure out which is the cause (there is no my own code as you can see): please could you help me understanding how to solve the problem?

Thank you very much and best Regards,

Marco.

javax.servlet.ServletContext log: Exception while dispatching incoming RPC call  java.lang.IllegalArgumentException: encodedRequest cannot be empty  	at com.google.gwt.user.server.rpc.RPC.decodeRequest(RPC.java:232)  	at com.google.gwt.user.server.rpc.RemoteServiceServlet.processCall(RemoteServiceServlet.java:206)  	at com.google.gwt.user.server.rpc.RemoteServiceServlet.processPost(RemoteServiceServlet.java:248)  	at com.google.gwt.user.server.rpc.AbstractRemoteServiceServlet.doPost(AbstractRemoteServiceServlet.java:62)  	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$CachedChain.doFilter(ServletHandler.java:1166)  	at com.google.apphosting.utils.servlet.ParseBlobUploadFilter.doFilter(ParseBlobUploadFilter.java:125)  	at org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1157)  	at com.google.apphosting.runtime.jetty.SaveSessionFilter.doFilter(SaveSessionFilter.java:35)  	at org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1157)  	at com.google.apphosting.utils.servlet.JdbcMySqlConnectionCleanupFilter.doFilter(JdbcMySqlConnectionCleanupFilter.java:57)  	at org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1157)  	at com.google.apphosting.utils.servlet.TransactionCleanupFilter.doFilter(TransactionCleanupFilter.java:43)  	at org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1157)  	at org.mortbay.jetty.servlet.ServletHandler.handle(ServletHandler.java:388)  	at org.mortbay.jetty.security.SecurityHandler.handle(SecurityHandler.java:216)  	at org.mortbay.jetty.servlet.SessionHandler.handle(SessionHandler.java:182)  	at org.mortbay.jetty.handler.ContextHandler.handle(ContextHandler.java:765)  	at org.mortbay.jetty.webapp.WebAppContext.handle(WebAppContext.java:418)  	at com.google.apphosting.runtime.jetty.AppVersionHandlerMap.handle(AppVersionHandlerMap.java:266)  	at org.mortbay.jetty.handler.HandlerWrapper.handle(HandlerWrapper.java:152)  	at org.mortbay.jetty.Server.handle(Server.java:326)  	at org.mortbay.jetty.HttpConnection.handleRequest(HttpConnection.java:542)  	at org.mortbay.jetty.HttpConnection$RequestHandler.headerComplete(HttpConnection.java:923)  	at com.google.apphosting.runtime.jetty.RpcRequestParser.parseAvailable(RpcRequestParser.java:76)  	at org.mortbay.jetty.HttpConnection.handle(HttpConnection.java:404)  	at com.google.apphosting.runtime.jetty.JettyServletEngineAdapter.serviceRequest(JettyServletEngineAdapter.java:146)  	at com.google.apphosting.runtime.JavaRuntime$RequestRunnable.run(JavaRuntime.java:439)  	at com.google.tracing.TraceContext$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:722)

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