Re: [Springframework-developer] DeadlockLoserDataAccessException vs CannotAcquireLockException

[Juergen H. <ju...@in...>]

Thomas, everybody,

We've decided to have DeadlockLoserDataAccessException as a subclass of
ConcurrencyFailureException in the meantime, but it's still unclear whether
that MySQL error mentioned in SPR-733 should actually be translated to a
CannotAcquireLockException or DeadlockLoserDataAccessException. The problem
is that the exact semantics of those two exceptions are somewhat unclear...

We currently throw CannotAcquireLockException in all such cases for other
databases, so it would make sense to do this for that MySQL error too. But
why does DeadlockLoserDataAccessException exist at all then? It currently
isn't used anywhere ... Can we discrimate between a general "cannot acquire
lock" error and the specific situation of the current process being a
"deadlock loser"?

Juergen


-----Original Message-----
From: spr...@li...
[mailto:spr...@li...]On Behalf
Of Juergen Hoeller
Sent: Tuesday, February 22, 2005 1:12 PM
To: spr...@li...
Subject: [Springframework-developer] DeadlockLoserDataAccessException vs
CannotAcquireLockException


Thomas, everybody,

Please have a look at the following JIRA issue:
http://opensource.atlassian.com/projects/spring/browse/SPR-733

I agree that DeadlockLoserDataAccessException should be a subclass of
ConcurrencyFailureException (which has been introduced in Spring 1.1), and
have already changed this locally.

However, DeadlockLoserDataAccessException isn't thrown anywhere;
SQLErrorCodes does not support it. So as indicated in SPR-733, should we
generally throw CannotAcquireLockException in such a case (which currently
seems to happen for some databases, as defined in sql-error-codes.xml)?
What's the semantic difference between those two exceptions, and is it worth
keeping both?

Juergen



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