From: <glassfish_at_javadesktop.org>
Date: Fri, 04 Jul 2008 07:41:05 PDT

could you try "table-based" validation ? [validation-type="table" validation-table-name="<VALID_TABLE_NAME>"]
http://blogs.sun.com/JagadishPrasath/entry/connection_validation_in_glassfish_jdbc
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