IndexOutOfBoundsException during serialization

[graff...@gmail.com]

I am getting the following on the serverside when trying to send the
results of an ajax call back to the client:

It is very intermittent which leads me to think that there might be a
threading issue or some kind of corruption.

12:33:54 ERROR (ApplicationContext.java:667) log - Exception while
dispatching incoming RPC call
java.lang.IndexOutOfBoundsException: Index: 0, Size: 0
at java.util.ArrayList.RangeCheck(ArrayList.java:546)
at java.util.ArrayList.get(ArrayList.java:321)
at
com.google.gwt.user.server.rpc.ServerSerializationStream.extract(ServerSerializationStream.java:133)
at
com.google.gwt.user.server.rpc.ServerSerializationStream.prepareToRead(ServerSerializationStream.java:108)
at
com.google.gwt.user.server.rpc.RemoteServiceServlet.processCall(RemoteServiceServlet.java:222)
at
com.google.gwt.user.server.rpc.RemoteServiceServlet.doPost(RemoteServiceServlet.java:186)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:709)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:802)
at
org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:252)
at
org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:173)
at
org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:213)
at
org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:178)
at
org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:126)
at
org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:105)
at
org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:107)
at
org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:148)
at
org.apache.jk.server.JkCoyoteHandler.invoke(JkCoyoteHandler.java:199)
at
org.apache.jk.common.HandlerRequest.invoke(HandlerRequest.java:282)
at
org.apache.jk.common.ChannelSocket.invoke(ChannelSocket.java:754)
at
org.apache.jk.common.ChannelSocket.processConnection(ChannelSocket.java:684)
at
org.apache.jk.common.ChannelSocket$SocketConnection.runIt(ChannelSocket.java:876)
at
org.apache.tomcat.util.threads.ThreadPool$ControlRunnable.run(ThreadPool.java:684)
at java.lang.Thread.run(Thread.java:595)

[semiot]

Since it's an intermittant array-out-of-bounds error, it sounds to me
like you could be running afoul the asynchronous nature of GWT
services. In other words, it could be a timing issue where one service
call depends on a previous one, but the earlier one hasn't completed
yet. Is this possible?