From: <glassfish_at_javadesktop.org>
Date: Fri, 19 Sep 2008 08:11:06 PDT

Here's the docs entry on the MySQL XA driver :

https://glassfish.dev.java.net/javaee5/docs/AG/ablih.html#gbsor

The datasource class name is listed as com.mysql.jdbc.jdbc2.optional.MysqlXADataSource
You should use that and change the res-type to javax.sql.XADataSource
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