I'm developing stateless session bean exposed as web service with bean managed transactions management (@TransactionManagement(TransactionManagementType.BEAN)).
All web methods looks similar to this:
@Resource
protected UserTransaction tx;
@PersistenceContext
protected EntityManager em;
public void myWebMethod(.....) throws MyException{
try{
tx.begin();
... call some write db operations on different entities using EntityManager
tx.commit();
} catch(RollbackException ex){
// here I need to know cause of rollbackexception using ex.getCause() in order to return message with reason why operation can't be completed to method caller.
// But ex.getCause() returns null ?
try{
tx.rollback();
}catch (Exception e){
}
throw new MyException("Reason of error....");
}
I''v checked out appserv-core module and found that J2EETransaction.commit() ignores catched RuntimeExceptinon at line 420 (and other places).
Actually I'm not sure it's an real issue, but it would quite useful to have a cause exception(i.e. SQLException) of RollbackException in service method from which we can pull information of real cause of problem and send appropriate message to service method caller.
Regards
Dragan.
Dragan Ljubojevic wrote:
> Why J2EETransaction.commit() implementation ignores cause of
> RollbackException? And why javax.transaction.RollbackException does not define/implement
> constructor RollbackException(String message, Throwable throwable);
>
>
>
> Current implementation of commit method catches
> RuntimeException, calls setRollbackOnly() and throws RollbackException with
> string key only(without cause).
>
>
>
>
> Will you break J2EE specification or lose some of
> distribution transaction features if you expand RollbackException class with
> new constructor and throw such constructed exception in commit() method?
>
> If
> not, can we expect such implementation in some of the future releases?
>
>
>
>
> Cause exception (i.e. SQLException ) can be useful in
> providing appropriate validation messages to web service clients. In this way
> we can put some input data validation on database back.
>
Please fine an issue.
regards
sankar
>
>
> Regards
> Dragan
>
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