stack overflow at line: 0

[ste...@gmail.com]

The shell browser pop up an message "statck overflow at line: 0" after
RPC call returns. no details for the popup.
the result seems to be OK, but when I send it back throght another RPC
call, the server throws an exception. here is the stacktrace.
[WARN] StandardContext[]Exception while dispatching incoming RPC call
com.google.gwt.user.client.rpc.SerializationException:
java.lang.reflect.InvocationTargetException
at
com.google.gwt.user.server.rpc.ServerSerializationStream.deserizeWithCustomSerializer(ServerSerializationStream.java:589)
at
com.google.gwt.user.server.rpc.ServerSerializationStream.deserialize(ServerSerializationStream.java:512)
at
com.google.gwt.user.server.rpc.ServerSerializationStream.readObject(ServerSerializationStream.java:443)
at
com.google.gwt.user.server.rpc.ServerSerializationStream.deserializeValue(ServerSerializationStream.java:411)
at
com.google.gwt.user.server.rpc.ServerSerializationStream.deserializeClass(ServerSerializationStream.java:468)
at
com.google.gwt.user.server.rpc.ServerSerializationStream.deserializeClass(ServerSerializationStream.java:478)
at
com.google.gwt.user.server.rpc.ServerSerializationStream.deserializeClass(ServerSerializationStream.java:478)
at
com.google.gwt.user.server.rpc.ServerSerializationStream.deserialize(ServerSerializationStream.java:519)
at
com.google.gwt.user.server.rpc.ServerSerializationStream.readObject(ServerSerializationStream.java:443)
at
com.google.gwt.user.server.rpc.ServerSerializationStream.deserializeValue(ServerSerializationStream.java:411)
at
com.google.gwt.user.server.rpc.RemoteServiceServlet.processCall(RemoteServiceServlet.java:290)
Caused by: java.lang.reflect.InvocationTargetException: null
at
sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
at
sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
at java.lang.reflect.Method.invoke(Method.java:585)
at
com.google.gwt.user.server.rpc.ServerSerializationStream.deserizeWithCustomSerializer(ServerSerializationStream.java:572)
at
com.google.gwt.user.server.rpc.ServerSerializationStream.deserialize(ServerSerializationStream.java:512)
at
com.google.gwt.user.server.rpc.ServerSerializationStream.readObject(ServerSerializationStream.java:443)
at
com.google.gwt.user.server.rpc.ServerSerializationStream.deserializeValue(ServerSerializationStream.java:411)
at
com.google.gwt.user.server.rpc.ServerSerializationStream.deserializeClass(ServerSerializationStream.java:468)
at
com.google.gwt.user.server.rpc.ServerSerializationStream.deserializeClass(ServerSerializationStream.java:478)
at
com.google.gwt.user.server.rpc.ServerSerializationStream.deserializeClass(ServerSerializationStream.java:478)
at
com.google.gwt.user.server.rpc.ServerSerializationStream.deserialize(ServerSerializationStream.java:519)
at
com.google.gwt.user.server.rpc.ServerSerializationStream.readObject(ServerSerializationStream.java:443)
at
com.google.gwt.user.server.rpc.ServerSerializationStream.deserializeValue(ServerSerializationStream.java:411)
at
com.google.gwt.user.server.rpc.RemoteServiceServlet.processCall(RemoteServiceServlet.java:290)
Caused by: com.google.gwt.user.client.rpc.SerializationException:
java.lang.reflect.InvocationTargetException
at
com.google.gwt.user.server.rpc.ServerSerializationStream.deserizeWithCustomSerializer(ServerSerializationStream.java:589)
at
com.google.gwt.user.server.rpc.ServerSerializationStream.deserialize(ServerSerializationStream.java:512)
at
com.google.gwt.user.server.rpc.ServerSerializationStream.readObject(ServerSerializationStream.java:443)
at
com.google.gwt.user.server.rpc.ServerSerializationStream.deserializeValue(ServerSerializationStream.java:411)
at
com.google.gwt.user.server.rpc.ServerSerializationStream.deserializeClass(ServerSerializationStream.java:468)
at
com.google.gwt.user.server.rpc.ServerSerializationStream.deserializeClass(ServerSerializationStream.java:478)
at
com.google.gwt.user.server.rpc.ServerSerializationStream.deserialize(ServerSerializationStream.java:519)
at
com.google.gwt.user.server.rpc.ServerSerializationStream.readObject(ServerSerializationStream.java:443)
at
com.google.gwt.user.client.rpc.core.java.util.HashMap_CustomFieldSerializer.deserialize(HashMap_CustomFieldSerializer.java:60)
at
sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
Caused by: java.lang.reflect.InvocationTargetException: null
at
sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
at
sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
at java.lang.reflect.Method.invoke(Method.java:585)
at
com.google.gwt.user.server.rpc.ServerSerializationStream.deserizeWithCustomSerializer(ServerSerializationStream.java:572)
at
com.google.gwt.user.server.rpc.ServerSerializationStream.deserialize(ServerSerializationStream.java:512)
at
com.google.gwt.user.server.rpc.ServerSerializationStream.readObject(ServerSerializationStream.java:443)
at
com.google.gwt.user.server.rpc.ServerSerializationStream.deserializeValue(ServerSerializationStream.java:411)
at
com.google.gwt.user.server.rpc.ServerSerializationStream.deserializeClass(ServerSerializationStream.java:468)
at
com.google.gwt.user.server.rpc.ServerSerializationStream.deserializeClass(ServerSerializationStream.java:478)
at
com.google.gwt.user.server.rpc.ServerSerializationStream.deserialize(ServerSerializationStream.java:519)
at
com.google.gwt.user.server.rpc.ServerSerializationStream.readObject(ServerSerializationStream.java:443)
at
com.google.gwt.user.client.rpc.core.java.util.HashMap_CustomFieldSerializer.deserialize(HashMap_CustomFieldSerializer.java:60)
Caused by: com.google.gwt.user.client.rpc.SerializationException:
java.lang.reflect.InvocationTargetException
at
com.google.gwt.user.server.rpc.ServerSerializationStream.deserizeWithCustomSerializer(ServerSerializationStream.java:589)
at
com.google.gwt.user.server.rpc.ServerSerializationStream.deserialize(ServerSerializationStream.java:512)
at
com.google.gwt.user.server.rpc.ServerSerializationStream.readObject(ServerSerializationStream.java:443)
at
com.google.gwt.user.server.rpc.ServerSerializationStream.deserializeValue(ServerSerializationStream.java:411)
at
com.google.gwt.user.server.rpc.ServerSerializationStream.deserializeClass(ServerSerializationStream.java:468)
at
com.google.gwt.user.server.rpc.ServerSerializationStream.deserialize(ServerSerializationStream.java:519)
at
com.google.gwt.user.server.rpc.ServerSerializationStream.readObject(ServerSerializationStream.java:443)
at
com.google.gwt.user.client.rpc.core.java.util.ArrayList_CustomFieldSerializer.deserialize(ArrayList_CustomFieldSerializer.java:49)
at
sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
at
sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
Caused by: java.lang.reflect.InvocationTargetException: null
at
sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
at
sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
at java.lang.reflect.Method.invoke(Method.java:585)
at
com.google.gwt.user.server.rpc.ServerSerializationStream.deserizeWithCustomSerializer(ServerSerializationStream.java:572)
at
com.google.gwt.user.server.rpc.ServerSerializationStream.deserialize(ServerSerializationStream.java:512)
at
com.google.gwt.user.server.rpc.ServerSerializationStream.readObject(ServerSerializationStream.java:443)
at
com.google.gwt.user.server.rpc.ServerSerializationStream.deserializeValue(ServerSerializationStream.java:411)
at
com.google.gwt.user.server.rpc.ServerSerializationStream.deserializeClass(ServerSerializationStream.java:468)
at
com.google.gwt.user.server.rpc.ServerSerializationStream.deserialize(ServerSerializationStream.java:519)
at
com.google.gwt.user.server.rpc.ServerSerializationStream.readObject(ServerSerializationStream.java:443)
at
com.google.gwt.user.client.rpc.core.java.util.ArrayList_CustomFieldSerializer.deserialize(ArrayList_CustomFieldSerializer.java:49)
Caused by: java.lang.StackOverflowError: null
at java.util.HashMap$EntryIterator.<init>(HashMap.java:827)
at java.util.HashMap$EntryIterator.<init>(HashMap.java:827)
at java.util.HashMap.newEntryIterator(HashMap.java:841)
at java.util.HashMap$EntrySet.iterator(HashMap.java:934)
at java.util.AbstractMap.hashCode(AbstractMap.java:555)
at java.util.HashMap$Entry.hashCode(HashMap.java:710)
at java.util.AbstractMap.hashCode(AbstractMap.java:557)
at java.util.HashMap$Entry.hashCode(HashMap.java:710)
at java.util.AbstractMap.hashCode(AbstractMap.java:557)
at java.util.HashMap$Entry.hashCode(HashMap.java:710)