spring getbean 用单例模式

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项目中用到Struts 1.2.9 + Spring 2.5 + hibernate 3.2.5框架

OperateLogService 是一个操作日志的service，里面有个插日志的方法logger，因为这个方法被很多地方调用，
所以我搞了这个OperateLogAddServiceImpl ，加了个静态方法，然后使用getbean，这样的话调用的地方就不需要注入OperateLogService 这个service

public class OperateLogAddServiceImpl {
public static void saveOperateLog(OperateLog operateLog) throws AppTranException{
OperateLogService operateLogService = (OperateLogService)SpringContextUtil.getBean("operateLogService");
operateLogService.logger(operateLog);
}
}

结果系统偶发性的出现问题，抛出下列错误信息，一重启tomcat，问题就没有了，但是过段时间又会重现，并且问题只在生产平台发生，本机无问题，从错误信息来看，说是什么事务方面的问题，当时以为是数据源或者事务什么的问题

Pre-bound JDBC Connection found! HibernateTransactionManager does not support running within DataSourceTransactionManager if told to manage the DataSource itself. It is recommended to use a single HibernateTransactionManager for all transactions on a single DataSource, no matter whether Hibernate or JDBC access

但是实际上是getbean的问题，将获取service实例改成下面单例模式，问题随即解决，问题虽然解决，但是还是不太明白原因，尤其是抛出来的错误跟问题有点不搭边

package com.lenovo.platform.operatelog.service.impl;
import com.lenovo.platform.exception.AppTranException;
import com.lenovo.platform.operatelog.service.OperateLogService;
import com.lenovo.platform.security.entity.OperateLog;
import com.lenovo.reconciliation.service.impl.SpringContextUtil;
public class OperateLogAddServiceImpl {
private static OperateLogService operateLogService = null;
synchronized private static OperateLogService getOperateLogService(){
  if(operateLogService == null){
   operateLogService = (OperateLogService)SpringContextUtil.getBean("operateLogService");
  }
  return operateLogService;
}
public static void saveOperateLog(OperateLog operateLog) throws AppTranException{
  OperateLogService operateLogService = getOperateLogService();
  operateLogService.logger(operateLog);
}
}