Optimistic Locking

freiburg Jun 27, 2003 4:36 AM

Hello to all,
I'd like to know how I can set jboss for using Optimistic locking instead of pessimistic locking as default. Which xml files I have to modify? Which tags I have to write?
Thank you very much,
Andrea

1. Re: Optimistic Locking

vanitas Jun 28, 2003 5:05 AM (in response to freiburg)

Hi,

In you standardjboss.xml put:
---
<locking-policy>org.jboss.ejb.plugins.lock.JDBCOptimisticLock</locking-policy>
---
instead of the
---
<locking-policy>org.jboss.ejb.plugins.lock.QueuedPessimisticEJBLock</locking-policy>
---

You must also define strategy for the locking in either deployement destriptor or in standardjbosscmp-jdbc.xml:
---
<optimistic-locking>
<modified-strategy/>
</optimistic-locking>
---
you can choose of a few strategies (look into jbosscmp-jdbc_3_2 under jboss/docs/dtd directory).

I'm testing this optimistic thing now, and unfortunetally I must say that I get plenty of 'Reentrant method call detected' errors :(.

best regards,
greg
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