Coping with the exception of optimistic locking in OpenJPA...?

Hi all

I have the code example that I'm calling from the main class (I don't use any server/container)

   public void updatePortName(String oldPortName, String newPortName)
                {
          EntityTransaction trx = em.getTransaction();
          trx.begin();// Checkpoint
          BcsPrimaryBuffer bcsPrimaryBuffer = (BcsPrimaryBuffer) em.find(BcsPrimaryBuffer.class,  
                                                                                                                                           oldPortName);
          
                                bcsPrimaryBuffer.setPort(newPortName); // IS THIS CORRECT ???
          em.merge(bcsPrimBuffer);

                                trx.commit();  //Throws exception
     }

I get the following exception on trx.commit ()...
My question is that I take the right approach here... ?
I need to update the port value in the BcsPrimaryBuffer table in db to the new value.

If need more info please let me know.

Exception in thread "main" <openjpa-1.0.0-r420667:568756 fatal store error> org.apache.openjpa.persistence.RollbackException: Optimistic locking errors were detected when flushing to the data store.  The following objects may have been concurrently modified in another transaction: [org.apache.openjpa.enhance.entities$BcsPrimaryBuffer$pcsubclass-JCVLFLU0523HD2160033-1-1-2-1]
     at org.apache.openjpa.persistence.EntityManagerImpl.commit(EntityManagerImpl.java:419)
     at entities.BcsPrimaryBufferDAO.updatePortName(BcsPrimaryBufferDAO.java:194)
     at com.test.local.EntityManagerTester.main(EntityManagerTester.java:36)
Caused by: <openjpa-1.0.0-r420667:568756 nonfatal store error> org.apache.openjpa.persistence.OptimisticLockException: Optimistic locking errors were detected when flushing to the data store.  The following objects may have been concurrently modified in another transaction: [org.apache.openjpa.enhance.entities$BcsPrimaryBuffer$pcsubclass-JCVLFLU0523HD2160033-1-1-2-1]
     at org.apache.openjpa.kernel.BrokerImpl.newFlushException(BrokerImpl.java:2096)
     at org.apache.openjpa.kernel.BrokerImpl.flush(BrokerImpl.java:1946)
     at org.apache.openjpa.kernel.BrokerImpl.flushSafe(BrokerImpl.java:1844)
     at org.apache.openjpa.kernel.BrokerImpl.beforeCompletion(BrokerImpl.java:1762)
     at org.apache.openjpa.kernel.LocalManagedRuntime.commit(LocalManagedRuntime.java:81)
     at org.apache.openjpa.kernel.BrokerImpl.commit(BrokerImpl.java:1292)
     at org.apache.openjpa.kernel.DelegatingBroker.commit(DelegatingBroker.java:861)
     at org.apache.openjpa.persistence.EntityManagerImpl.commit(EntityManagerImpl.java:408)
     ... 2 more

Ok
so your idea of "delete the entity with the old port number, insert a new one with the new port number" would be a good solution

Tags: Java

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Coping with the exception of optimistic locking in OpenJPA...?

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