For everybody else, here's a link to the bug report:
http://jira.jboss.com/jira/browse/JBAS-2641
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Its an implementation detail limitation of the underlying DataOutputStream:
http://java.sun.com/products/jdk/serialization/faq/
# Why is UTFDataFormatException thrown by DataOutputStream.writeUTF() when
serializing a String?
DataOutputStream.writeUTF() does not support writing out strings