Ping failed in MysqlValidConnectionChecker in JBoss/MySQL-ConnectorJ Combination

Today I was battling an issue for some of my colleagues. They were getting this exception from JBoss/Mysql ConnectorJ driver:

java.sql.SQLException: Unexpected error in ping : java.lang.IllegalArgumentException: object is not an instance of declaring class

in the JBoss console.

Then making a Google search for above error and we read a bit of forums that was mentioning the error. Which talked about problems due to a bug jconnector mysql. So we tried upgraded from 5.1.6 to 5.1.12 drivers no good. We also downgraded to 5.1.5 still no good. Than we removed the connector from applications WEB-INF/lib folder and placed it under $JBOSS_HOME/server/default/lib. Result: The application is better and I no longer have the above-mentioned exception.

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