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From Rafal Rusin <rafal.ru...@gmail.com>
Subject Re: Hang while using delete in (?, ?) prepared statement for two nulls
Date Thu, 08 Oct 2009 23:12:35 GMT
Thanks for your answer.
BTW. There's ongoing progress in ODE for migrating from Derby to H2
for embedded database, particularly due to lacking support for MVCC,
which raises deadlocks in concurrent scenarios in ODE
(https://issues.apache.org/jira/browse/ODE-666). I'm not actually
happy of that, because H2 is not so mature project and I'm afraid we
could step into precipice.
But are going to support MVCC in some future in Derby?

BTW 2. Here's a H2 <-> Derby comparison, which may be used for future
improvements of Derby:

2009/10/8 Knut Anders Hatlen <Knut.Hatlen@sun.com>:
> Rafal Rusin <rafal.rusin@gmail.com> writes:
>> Hello,
>> I'm a committer from Apache ODE. We had a hang on derby while
>> we used such prepared statement.
>> We use JTA environment with Tranql and Geronimo embedded, but I think
>> it's not related to this problem.
>> Here's a code to reproduce this hang:
> [...]
>> This statement doesn't make much sense, but we lost a lot of time
>> figuring out what's going on. Alexis Midon found eventually a cause.
>> Is there a chance of fixing it (or at least throwing error on nulls)?
> This bug was actually fixed just a couple of weeks ago, see
> https://issues.apache.org/jira/browse/DERBY-4376. I tried the code you
> posted, and it does reproduce the hang with Derby, but it does
> not hang when I test it with head of trunk. The fix is also available on
> the 10.5 branch.
>> FYI, here's an entry in ODE jira: https://issues.apache.org/jira/browse/ODE-671
> I've posted a link to DERBY-4376 on that issue.
> --
> Knut Anders

RafaƂ Rusin

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