Another problem could be that their http://download.oracle.com/javaee/6/api/javax/resource/spi/ManagedConnectionFactory.html#matchManagedConnections%28java.util.Set,%20javax.security.auth.Subject,%20javax.resource.spi.ConnectionRequestInfo%29 method is implemented incorrectly, since it is the return of that method that generates the IJ-612 WARN.
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