How to use it in Google App Engine with JPA 2.0?

[asmilk ceng]

Hi All,

I try to use it in Google App Engine 1.7.5 with JPA 2.0, and the Datanucleus JPA version is V2.

here is the lib in the classpath:

• datanucleus-api-jpa-3.1.3.jar
• datanucleus-appengine-2.1.2.jar
• datanucleus-core-3.1.3.jar
• datanucleus-enhancer-3.1.1.jar
  
• geronimo-jpa_2.0_spec-1.0.jar
• jdo-api-3.0.1.jar
• jta-1.1.jar
• asm-4.0.jar
• dao-1.1.0.jar
• search-1.1.0.jar
• persistence-api-1.0.jar
• slf4j-api-1.7.2.jar

EntityManager entityManager = EMF.get().createEntityManager();
JPAAnnotationMetadataUtil metadataUtil = new JPAAnnotationMetadataUtil();
JPASearchProcessor searchProcessor = new JPASearchProcessor(metadataUtil);

PersonDaoImpl personDao = new PersonDaoImpl();
personDao.setEntityManager(entityManager);
personDao.setSearchProcessor(searchProcessor);

Search search = new Search(Person.class);
search.addFilterEqual("name", "asmilk");
List<Person> personList = personDao.search(search);
for(Person person : personList) {
        LOG.info("Item:" + person.toString());
}


Then I got this error:

Uncaught exception from servlet
java.lang.NoSuchFieldError: PESSIMISTIC_READ
	at org.datanucleus.api.jpa.JPAQuery.getResultList(JPAQuery.java:171)
	at com.googlecode.genericdao.search.jpa.JPASearchProcessor.search(JPASearchProcessor.java:81)
	at com.googlecode.genericdao.dao.jpa.JPABaseDAO._search(JPABaseDAO.java:322)
	at com.googlecode.genericdao.dao.jpa.GenericDAOImpl.search(GenericDAOImpl.java:123)

If I change Datanucleus JPA version to V1 which use datanucleus-core-1.1.5.jar. I can use the same code to get the result without any error. any idea for this?

Regards,
Asmilk Ceng

[David Wolverton]

Try the newest version of the framework, described here https://groups.google.com/forum/?fromgroups=#!topic/java-generic-dao/ATcVfJzF7IE. It is supposed to support JPA 2.

This is currently a snapshot release, but I think it's pretty much final and ready to go to release so don't worry about it changing.

Let us know how it goes.

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[asmilk ceng]

Hi David,

I change to use spring-data-jpa which is also work fine with GAE.

Regards,
Asmilk Ceng

[kannan.k...@gmail.com]

Hi ,

 

I have recently downloaded the same set of jars and working fine in eclipse . But i got same problem after uploaded into Google App engine server.

 

is there anything to do with transaction settings ?

 

regards,,

Kannan

[krzysztof...@gmail.com]

It is persistence-api-1.0.jar which causes the problem. geronimo-jpa_2.0_spec-1.0.jar has newer version of JPA API, so you can just remove persistence-api-1.0.jar and everything will work fine.