Chris Watts created CAMEL-7053:
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Summary: JPA Skip locked entities
Key: CAMEL-7053
URL: https://issues.apache.org/jira/browse/CAMEL-7053
Project: Camel
Issue Type: New Feature
Components: camel-jpa
Affects Versions: 2.12.1
Reporter: Chris Watts
Attachments: skipLockedJpa.patch
The current implementation of the JPA endpoint is catered more for using it as
a queue for one JVM.
This change performs the lock with timeout=0, causing a NOWAIT to be used where
implementations support it.
Ideally the lock should be performed using refresh() instead of lock() to
prevent dirty read exceptions but Hibernate's implementation throws the wrong
exception.
https://hibernate.atlassian.net/browse/HHH-8786
Currently OpenJPA throws the wrong exception for both lock and refresh so the
test uses hibernate. See this jira:
https://issues.apache.org/jira/browse/OPENJPA-2461
The default lock of WRITE=OPTIMISTIC_FORCE_INCREMENT performs the lock too late
and their are various jpa implementation problems (OpenJPA doesn't lock it in
memory, hibernate performs the delete before the increment). In nearly every
use case PESSIMISTIC_WRITE is more correct.
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