The issue is an index out of bounds (stack trace below). Editing the
jar, I've found that it tries to access up to an index of 26, despite
the size being only 9.

[WARN] StandardContext[]Exception while dispatching incoming RPC call
java.lang.IndexOutOfBoundsException: Index: 9, Size: 9
        at
com.google.gwt.user.server.rpc.impl.ServerSerializationStreamReader.extract (ServerSerializationStreamReader.java:259)
        at
com.google.gwt.user.server.rpc.impl.ServerSerializationStreamReader.deseria lizeStringTable(ServerSerializationStreamReader.java:207)
        at
com.google.gwt.user.server.rpc.impl.ServerSerializationStreamReader.prepare ToRead(ServerSerializationStreamReader.java:80)
        at
com.google.gwt.user.server.rpc.RemoteServiceServlet.processCall(RemoteServi ceServlet.java:181)
        at
com.google.gwt.user.server.rpc.RemoteServiceServlet.doPost(RemoteServiceSer vlet.java:147)
        at javax.servlet.http.HttpServlet.service(HttpServlet.java:709)
        at javax.servlet.http.HttpServlet.service(HttpServlet.java:802)
        at
com.google.gwt.dev.shell.GWTShellServlet.service(GWTShellServlet.java:175)
        at javax.servlet.http.HttpServlet.service(HttpServlet.java:802)
        at
org.apache.catalina.security.SecurityUtil$1.run(SecurityUtil.java:239)

There is a known issue with client->server serialization when the same
object is serialized multiple times.  There's a workaround here that
should hopefully fix the problem.

http://groups.google.com/group/Google-Web-Toolkit/browse_thread/threa...

Scott

If that didn't fix the issue (and you've recompiled/cleared browser's
cache/etc), then I'm not sure what to tell you without looking at your
project.

Scott

My data structures were in this logic.

Master data class contained sub data classes
sub data classes contained char[] array.

if the char[] array contained a value of 0 anywhere inside it, the
token system on the server would stop at that point as a string
terminator. It looks like gwt needs to do something about char array's
containing 0.

For now I'll just explicitly set all 0's to 1 before sending.