In my application I am connecting to Sybase database from hibernate.I tried setting locks using
1.session.load(class,id,LOCKMODE.UPGRADE)
2.session.lock(obj,LOCKMODE.UPGRADE)

I tested the lock using threads ,but its not locking the rows.All the thread are being given shared lock.So wen i update the value differs.I have set the transaction isolation level using
<property name="hibernate.connection.isolation">
but stilll its not locking the row..
Can anyone advice on what can be done to get an exclusive lock on one record.Is it sybase specific problem.??

my requirement was that i wanted to do a select for update.I should acquire lock on certain rows and do a matching and if concurrent request comes ,it should wait till transaction is over that is lock is released.

When I went through the hibernate code,the hibernate is making static queries in the beginning while loading session factory.Since we are appending the holdlock during execution,the sybase dialect is not appending.
As a work around I tested with native sql with holdlock but when I test concurrent request using threads its bombing.Its throwing LockAcquisitionException.( Your server command (family id #0, process id #3777) encountered a deadlock situation.).can anyone give a solution to this problem???


org.hibernate.exception.LockAcquisitionException: could not update: [com.citco.aexeo.common.dataaccess.domain.Fund#12]
at org.hibernate.exception.SQLStateConverter.convert(SQLStateConverter.java:84)
at org.hibernate.exception.JDBCExceptionHelper.convert(JDBCExceptionHelper.java:43)
at org.hibernate.persister.entity.AbstractEntityPersister.update(AbstractEntityPersister.java:2223)
at org.hibernate.persister.entity.AbstractEntityPersister.updateOrInsert(AbstractEntityPersister.java:2118)
at org.hibernate.persister.entity.AbstractEntityPersister.update(AbstractEntityPersister.java:2375)
at org.hibernate.action.EntityUpdateAction.execute(EntityUpdateAction.java:91)
at org.hibernate.engine.ActionQueue.execute(ActionQueue.java:250)
at org.hibernate.engine.ActionQueue.executeActions(ActionQueue.java:233)
at org.hibernate.engine.ActionQueue.executeActions(ActionQueue.java:140)
at org.hibernate.event.def.AbstractFlushingEventListener.performExecutions(AbstractFlushingEventListener.java:297)
at org.hibernate.event.def.DefaultFlushEventListener.onFlush(DefaultFlushEventListener.java:27)
at org.hibernate.impl.SessionImpl.flush(SessionImpl.java:985)
at org.hibernate.impl.SessionImpl.managedFlush(SessionImpl.java:333)
at org.hibernate.transaction.JDBCTransaction.commit(JDBCTransaction.java:107)
at com.satyam.Testing.doTransaction(Testing.java:103)
at com.satyam.MyRunnable.run(MyRunnable.java:13)
at java.lang.Thread.run(Thread.java:568)
Caused by: com.sybase.jdbc2.jdbc.SybSQLException: Your server command (family id #0, process id #3777) encountered a deadlock situation. Please re-run your command.

at com.sybase.jdbc2.tds.Tds.processEed(Tds.java:2636)
at com.sybase.jdbc2.tds.Tds.nextResult(Tds.java:1996)
at com.sybase.jdbc2.jdbc.ResultGetter.nextResult(ResultGetter.java:69)
at com.sybase.jdbc2.jdbc.SybStatement.nextResult(SybStatement.java:204)
at com.sybase.jdbc2.jdbc.SybStatement.nextResult(SybStatement.java:187)
at com.sybase.jdbc2.jdbc.SybStatement.updateLoop(SybStatement.java:1642)
at com.sybase.jdbc2.jdbc.SybStatement.executeUpdate(SybStatement.java:1625)
at com.sybase.jdbc2.jdbc.SybPreparedStatement.executeUpdate(SybPreparedStatement.java:91)
at org.hibernate.jdbc.NonBatchingBatcher.addToBatch(NonBatchingBatcher.java:23)
at org.hibernate.persister.entity.AbstractEntityPersister.update(AbstractEntityPersister.java:2205)
... 14 more

After trying out different possibilities we found that pessimisstic locking is working fine with jre1.5 but not working for jre1.4.Can anyone help on why its not working with jre 1.4....

did u find the solution for this???
i m also facing the same problem..
plz help me if u have any clue regarding the same

Hi Sameer11sep,

You can read my opinion about this problem here: http://opensource.atlassian.com/project ... e/HHH-2131

I think that's it's an Hibernate Bug.

I Watch the issue and wait for an Hibernate Team Member response.