Does an entity bean (ejb 3.x) required container?

Question

Is it possible to run entity bean without container? If so example please.

Note that an EJB entity bean is NOT the same as a JPA entity. — Mike Braun, Dec 03 '12 at 09:33

score 3 · Answer 1 · answered Dec 01 '12 at 15:58

3

JPA can be used outside of a Java EE container, yes. The specification of JPA2 starts with these words:

This document is the specification of the Java API for the management of persistence and object/relational mapping with Java EE and Java SE.

(emphasis mine)

You won't have automatic support for persistence unit injection, JTA support, etc, though. Spring helps in this area.

answered Dec 01 '12 at 15:58

JB Nizet

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Thanks @JB Nizet the following post helps me lot. http://stackoverflow.com/questions/9419223/can-jpa-2-0-be-used-without-javaee-6?rq=1 – laksys Dec 01 '12 at 16:22

score 0 · Answer 2 · answered Dec 01 '12 at 21:22

The main differences with running inside container are definition of persistence-unit and handling transactions. For an example, persistence-unit is defined as follows, in persistence.xml:

<persistence-unit name="pu_name" transaction-type="RESOURCE_LOCAL">

Then you will need to obtain EntityTransaction and use it:

EntityManagerFactory emf = Persistence.createEntityManagerFactory("pu_name");
EntityManager em = emf.createEntityManager();

EntityTransaction tx = em.getTransaction();
tx.begin();
...
...
tx.commit();

em.close();
emf.close();

Does an entity bean (ejb 3.x) required container?

2 Answers2