org.apache.jasper.JasperException: org.apache.ibatis.exceptions.PersistenceException: ### Error opening session. Cause: com.mysql.jdbc.exceptions.jdbc4.MySQLNonTransientConnectionException: Communications link failure during rollback(). Transaction resolution unknown. ### Cause: com.mysql.jdbc.exceptions.jdbc4.MySQLNonTransientConnectionException: Communications link failure during rollback(). Transaction resolution unknown.