spring管理hibernate的事务后异常怎莫捕获不到？
现在遇到的问题，在ssh中，spring管理hibernate的事务。现在业务层有个方法try {
System.out.println("1---->");
auserDao.save(auser);
} catch (Exception e) {
System.out.println("添加用户出现异常");
throw new AuctionException("添加用户出现异常");
}
System.out.println("2---->");
return auser;
这里想捕获一下异常，然后又抛到action中。AuctionException是继承Exception的一个自定义类。
public String addAuser() throws AuctionException {
System.out.println(auserName);
System.out.println(auserPass);
auser = manager.addAuser(auserName, auserPass, 3);
if (auser != null) {
ActionContext.getContext().getSession().put("auser", auser);
return SUCCESS;
} else {
return ERROR;
}
}
然后struts.xml配置全局异常
<global-results>
<result name="exception">/error.jsp</result>
</global-results>
<global-exception-mappings>
<exception-mapping name="exception" exception="per.elec.utils.AuctionException"
result="exception"></exception-mapping>
<exception-mapping name="exception" exception="java.lang.Exception"
result="exception"></exception-mapping>
</global-exception-mappings>
添加用户中auserName不能为空，但运行时让auserName为空，按理说业务层应该会出现异常，并且能捕获到异常，然后抛到action中，通过struts2的配置文件跳到指定的页面。
可是运行的时候统统不起作用。
null
null
1---->
2---->
2013-5-16 20:06:57 com.opensymphony.xwork2.util.logging.commons.CommonsLogger error
严重: Exception occurred during processing request: Could not execute JDBC batch update; SQL [insert into elec.auser (auser_name, auser_pass, auser_money, limit_id, photo_id, auser_id) values (?, ?, ?, ?, ?, ?)]; constraint [null]; nested exception is org.hibernate.exception.ConstraintViolationException: Could not execute JDBC batch update
org.springframework.dao.DataIntegrityViolationException: Could not execute JDBC batch update; SQL [insert into elec.auser (auser_name, auser_pass, auser_money, limit_id, photo_id, auser_id) values (?, ?, ?, ?, ?, ?)]; constraint [null]; nested exception is org.hibernate.exception.ConstraintViolationException: Could not execute JDBC batch update
at org.springframework.orm.hibernate3.SessionFactoryUtils.convertHibernateAccessException(SessionFactoryUtils.java:643)
at org.springframework.orm.hibernate3.HibernateTransactionManager.convertHibernateAccessException(HibernateTransactionManager.java:793)
at org.springframework.orm.hibernate3.HibernateTransactionManager.doCommit(HibernateTransactionManager.java:664)
at org.springframework.transaction.support.AbstractPlatformTransactionManager.processCommit(AbstractPlatformTransactionManager.java:754)
at org.springframework.transaction.support.AbstractPlatformTransactionManager.commit(AbstractPlatformTransactionManager.java:723)
at org.springframework.transaction.interceptor.TransactionAspectSupport.commitTransactionAfterReturning(TransactionAspectSupport.java:394)
at org.springframework.transaction.interceptor.TransactionInterceptor.invoke(TransactionInterceptor.java:120)
at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:172)
at org.springframework.aop.framework.JdkDynamicAopProxy.invoke(JdkDynamicAopProxy.java:202)
at $Proxy5.addAuser(Unknown Source)
at per.elec.action.UpdateAuserAction.addAuser(UpdateAuserAction.java:145)
.......
页面也是出现一大堆异常信息，没有跳到指定页
HTTP Status 500 - Could not execute JDBC batch update; SQL [insert into elec.auser (auser_name, auser_pass, auser_money, limit_id, photo_id, auser_id) values (?, ?, ?, ?, ?, ?)]; constraint [null]; nested exception is org.hibernate.exception.ConstraintViolationException: Could not execute JDBC batch update
--------------------------------------------------------------------------------
type Exception report
message Could not execute JDBC batch update; SQL [insert into elec.auser (auser_name, auser_pass, auser_money, limit_id, photo_id, auser_id) values (?, ?, ?, ?, ?, ?)]; constraint [null]; nested exception is org.hibernate.exception.ConstraintViolationException: Could not execute JDBC batch update
description The server encountered an internal error that prevented it from fulfilling this request.
exception
org.springframework.dao.DataIntegrityViolationException: Could not execute JDBC batch update; SQL [insert into elec.auser (auser_name, auser_pass, auser_money, limit_id, photo_id, auser_id) values (?, ?, ?, ?, ?, ?)]; constraint [null]; nested exception is org.hibernate.exception.ConstraintViolationException: Could not execute JDBC batch update
org.springframework.orm.hibernate3.SessionFactoryUtils.convertHibernateAccessException(SessionFactoryUtils.java:643)
上面输出结果的两个null是指auserName与auserPass为null，程序肯定会报异常，但为什么在业务层的那个try..catch不起作用？业务层的事务是不是都在退出方法以后才提交，也就是方法都退出了才出现异常，所以才捕获不到？像auserDao.save(auser)之类的操作都还没有提交事务？
业务层的异常没有捕获到，在action中也是直接抛异常，但为什么struts.xml里的全局异常不起作用？
这个问题比较急，希望能有人帮忙回答，谢谢！
补充：Java , Java EE
