Trouble with GWT 2.0.4, RPC and non root account

Hi.

I've the following scenario:

- NetBeans IDE 7.0 with GWT4NB
- Mid sized application running GWT 2.0.4 with some extensions (like
GWT Math, for BigDecimals)
- Apache Tomcat 7.0.11 and Apache Tomcat 7.0.20

Exactly same setup running on Windows works great.
When running in Linux, if I run as root, works great. As my limited
user, throws the following server side exception:

GRAVE: Exception while dispatching incoming RPC call
com.google.gwt.user.client.rpc.SerializationException:
java.lang.reflect.InvocationTargetException at
com.google.gwt.user.server.rpc.impl.ServerSerializationStreamWriter.serializeWithCustomSerializer(ServerSerializationStreamWriter.java:
760) at
com.google.gwt.user.server.rpc.impl.ServerSerializationStreamWriter.serializeImpl(ServerSerializationStreamWriter.java:
723) at
com.google.gwt.user.server.rpc.impl.ServerSerializationStreamWriter.serialize(ServerSerializationStreamWriter.java:
612)...

I've tracked it down to a BigDecimal data type.

Why does this happen only with non root accounts?
I have already checked permissions on Tomcat, Tomcat Base, and
NetBeans, and they are all fine. I really suspect that is something
related to permissions, but I have no clue where to look for.
I've been searching for 2 days without success.

I'll appreciate your help.

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