之前软件在Server 2003 32位服务器上运行正常，换了dellR720 64位服务器以后，平均10个小时会报一次以上错误Servlet.service() for servlet action threw exception org.springframework.transaction.TransactionSystemException: Could not commit Hibernate transaction; nested exception is org.hibernate.TransactionException: JDBC commit failed
Caused by: com.mysql.jdbc.exceptions.MySQLNonTransientConnectionException: Connection.close() has already been called. Invalid operation in this state.
at com.mysql.jdbc.SQLError.createSQLException(SQLError.java:888)
at com.mysql.jdbc.Connection.getMutex(Connection.java:3640)
at com.mysql.jdbc.Connection.commit(Connection.java:2242)
at org.hibernate.transaction.JDBCTransaction.commitAndResetAutoCommit(JDBCTransaction.java:139)
at org.hibernate.transaction.JDBCTransaction.commit(JDBCTransaction.java:115)，后来我把tomcat装到默认路径C:\Program Files（X86）底下，数据库也是在这，大约40小时报一次错，页面打印错误是HTTP500
The full stack trace of the root cause is available in the Apache Tomcat/6.0但是重启tomcat以后页面正常了，过一段时间又开始打印localhost.log文件了，这个错误有人说是由于数据库保持连接时间短，但是把那个时间设置长了又影响性能，求各位大神指导！！

服务器：dell R720 操作系统server2008 tomcat版本6.0.37，数据库用的mysql 5.0.27，实时数据采集用的twincat tcat_2100_1335