Its a bug in JDK 1.4.2_xx

Javasoft bug 4880633

The class XMLEncoder, which is meant to be threadsafe, uses the class 
java.beans.Statement which is also meant to be threadsafe, but isn't as it uses 
HashMap.  

Must say, once we managed to get a coredump in the right format to HP, they found the 
cause of this issue within hours -and supplied a JAR which when put on the 
-Xbootclasspath fixes the problem by replacing the class java.beans.Statement with a 
version that uses Hashtable.

Well done HP   Although, if SIGQUIT aka thread dump was not also broken in 1.4.2_00 
(and upto _02) we would have found this out ourselves.

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