Hi,
The deadlock occurs when locking the objects. More specifically, in the
first write-lock of the object which happens to persists it.
These are my locking properties in OJB.properties:
LockManagerClass=org.apache.ojb.odmg.locking.LockManagerDefaultImpl
LockMapClass=org.apache.ojb.odmg.locking.InMemoryLockMapImpl
LockTimeout=60000
ImplicitLocking=true
LockAssociations=READ
Thanks,
Jair Jr
----- Original Message -----
From: "Armin Waibel" <[EMAIL PROTECTED]>
To: "OJB Users List" <[EMAIL PROTECTED]>
Sent: Tuesday, December 02, 2003 8:41 PM
Subject: Re: deadlock in transaction.lock
> Hi,
>
> Jair da Silva Ferreira Júnior wrote:
>
> > Hi,
> > I am using ojb1.0_rc4, ODMG api with OJB queries, mysql4 in Linux
Red Hat 7.3 (kernel 2.4.20-20.7).
> > I am experiencing the following problem: when multiple threads
(about 20) try to write lock an object, at some point, the
transaction.lock(object,Transaction.WRITE) method simply doesn't return and
my thread never dies. This is causing my application to deadlock. I am
locking different objects in each thread.
> >
> Did the deadlock occur while locking the objects
> or when commit the transaction? Which lock map
> implementation do you use?
>
> regards,
> Armin
>
> > I have tried the following <connection-pool> configurations in
repository_database.xml with no success:
> > <connection-pool maxActive="50" validationQuery=""
whenExhaustedAction="1" maxWait="4000"/>
> > <connection-pool maxActive="3" validationQuery=""
whenExhaustedAction="2" maxWait="4000"/>
> >
> > Do you know why this is happening? The transaction.lock(..) method
should throw an exception if the object can't be locked, right? Any help
would be appreciated.
> >
> > Thanks,
> > Jair Jr
>
>
>
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