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Re: [eclipselink-users] Recovering from optimistic lock exception
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Unfortunately it's a JPA spec. requirement:
3.1.1 EntityManager Interface
states that:
"Runtime exceptions thrown by the methods of the EntityManager interface
other than the Lock-TimeoutException will cause the current transaction
to be marked for rollback."
On 8/1/2013 11:03 AM, Dennis Fuglsang wrote:
I would like to automatically handle optimistic lock exceptions through
user defined merge policies however while testing my logic in a simple
test case I encounter an exception when committing the transaction.
If a merge fails are you not able to attempt to merge again in the same
transaction?
_javax.persistence.RollbackException_: Transaction rolled back because
transaction was set to RollbackOnly.
at
org.eclipse.persistence.internal.jpa.transaction.EntityTransactionImpl.commitInternal(_EntityTransactionImpl.java:92_)
at
org.eclipse.persistence.internal.jpa.transaction.EntityTransactionImpl.commit(_EntityTransactionImpl.java:63_)
EntityManager em = /createEntityManager/();
*try*{
em.getTransaction().begin();
mergeInstance(em, entity_b);
em.getTransaction().commit();
} *catch*(Exception p) {
Assert./fail/(p.getMessage());
} *finally*{
*if*(em.isOpen()) {
em.close();
}
}
*private**void*mergeInstance(EntityManager em, InstanceImpl entity) {
*int*retryCount = 2;
*int*cnt = 0;
InstanceImpl localEntity = entity;
*while*(cnt < retryCount) {
*try*{
localEntity = em.merge(localEntity);
*return*;
} *catch*(OptimisticLockException e) {
cnt++;
System./out/.println("\n>>> Optimistic Lock Exception
encountered, retry number "+cnt);
String sql = "SELECT e FROM InstanceImpl e WHERE e.uuid
IN ('"//$NON-NLS-1$
+ localEntity.getUUID().toString() + "')";
//$NON-NLS-1$
Query query = em.createQuery(sql);
query.setHint(QueryHints./CACHE_USAGE/,
CacheUsage./DoNotCheckCache/);
// Merge local data with latest repository data
InstanceImpl repoEntity =
(InstanceImpl)query.getSingleResult();
localEntity.setOptLock(repoEntity.getOptLock());
}
}
}
--
Oracle <http://www.oracle.com/>
Dennis Fuglsang | Consulting Member Technical Staff
Phone: +1 314 682 0497 <tel:+1%20314%20682%200497> | Mobile: +1 314 607
8087 <tel:+1%20314%20607%208087>
OracleOracle SOA Governance - Enterprise Repository
424 South Woods Mill Road | Chesterfield, MO 63017
Green Oracle <http://www.oracle.com/commitment>
Oracle is committed to developing practices and products that help
protect the environment
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