jboss+mysql+hibernate 出現錯誤!!!!!!!

hibernate發表於2003-07-31
MySql
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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請教怎麼解決這個問題

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