jboss+mysql+hibernate 出现错误!!!!!!!
04:16:12,636 INFO [SessionFactoryImpl] Use outer join fetching: true
04:16:12,696 WARN [JDBCExceptionReporter] SQL Error: 0, SQLState: null
04:16:12,696 ERROR [JDBCExceptionReporter] Could not create connection; - nested
throwable: (java.sql.SQLException: Could not map transaction isolation 'l to a valid JDBC level.); - nested throwable: (org.jboss.resource.JBossResourceException: Could not create connection; - nested throwable: (java.sql.SQL
Exception: Could not map transaction isolation 'l to a valid JDBC
level.))
.....
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请教怎么解决这个问题