From: <glassfish_at_javadesktop.org>
Date: Sat, 07 Apr 2007 11:10:25 PDT

I found a pretty good workaround; I set the "toplink.target-database"-property to Derby for which java.lang.Long was mapped to BIGINT, which also was the only difference between Derby and DB2.
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http://forums.java.net/jive/thread.jspa?messageID=211462