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JPA on Tomcat

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How to configure on Tomcat

1. copy lib/development/spring-instrument-tomcat.jar to tomcat/lib/ext
2. Edit conf/Catalina/localhost/ROOT.xml and add this line in the "Context" element.

    <Loader loaderClass="org.springframework.instrument.classloading.tomcat.TomcatInstrumentableClassLoader"/>
3. Delete hibernate3.jar from WEB-INF/lib
4. Copy to WEB-INF/lib
    persistence.jar
    eclipselink.jar
5. configure portal-ext.properties

    1. persistence.provider=jpa
    2. transaction.isolation.portal=-1   # Notice that the value is negative 1 which means default
    3. transaction.isolation.counter=-1

See:

Note:

Works only with TopLink and EclipseLink.
Although JPA is a spec, not everything works with just any JPA provider. See this blog for details.
- Hibernate JPA has these bugs
  - https://forum.hibernate.org/viewtopic.php?f=1&t=998837&sid=06373cbf8023349f4f38c342aadc54b1
  - https://forum.hibernate.org/viewtopic.php?f=1&t=999049&p=2416582#p2416582
  - https://forum.hibernate.org/viewtopic.php?f=1&t=998876
- OpenJPA has this bug
  - http://n2.nabble.com/overriding-accesors-in-entity-need-tranisent-declaration-tp3363414p3363414.html

TODO

Make it work with OpenJPA and Hibernate JPA
Test with other transaction managers
Test with other App Servers
Dynamic Query API
Implement query cache using provider specific hints
Current ScrollableResults is a minimal, non-optimal implementation. Since JPA does not provide one, should implement our own or leverage various mechanisms in a provider specific manner. See toplink-tips and eclipselink-ext.
Remove any hibernate dependence
1. com.liferay.counter.service.persistence.IDGenerator (if unused, remove)
2. com.liferay.portal.dao.shard.ShardSessionFactoryTargetSource
3. Fix HIBERNATE_JDBC_BATCH_SIZE in BatchSessionImpl

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Commenti	Autore	Data
Will the end result be that Liferay orm...	Richard Knight	30 giugno 2009 12.34
No. The mappings will be available as orm.xml...	Prashant Dighe	30 agosto 2009 17.53