the first one is 'simply' caused by not having the MySqlDS configured correctly.
See
http://wiki.jboss.org/wiki/SetUpAMysqlDatasource for more info.
The second one is most likely caused by not having the correct hibernate dialect.
Additional info can be found on
http://docs.jboss.com/jbpm/v3/userguide/thejbpmdatabase.html
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