How get EntityManager in OSGI in Abstract Class?(like spring @PersistenceContext)

Question

I tried create BaseDao and inject EntityManager to it. In Spring I was make this:

public abstract class BaseJpaDao<E> implements BaseDao<E>{
    protected Class<?> entityClass;

    @PersistenceContext(unitName = "access")
    protected EntityManager entityManager;

    public BaseJpaDao(Class<?> entityClass) {
        this.entityClass = entityClass;
    }

    @Override
    public E persist(E e) {
        entityManager.persist(e);
        return e;
    }

but now I tried make this in OSGI and I not understand how do it. I treid write in blueprint.xml

<bean id="baseJpaDao" class="domain.access.impl.BaseJpaDao" >
    <jpa:context unitname="access" property="entityManager"/>
    <tx:transaction method="*" value="RequiresNew"/>
</bean>

and after this

public abstract class BaseJpaDao<E> implements BaseDao<E>{
    protected Class<?> entityClass;

    private EntityManager entityManager;

    public void setEntityManager(EntityManager entityManager) {
        this.entityManager = entityManager;
    }

    public BaseJpaDao(Class<?> entityClass) {
        this.entityClass = entityClass;
    }

    @Override
    public E persist(E e) {
        entityManager.persist(e);
        return e;
    }

I treid like this link

but not help.

I tried this

EntityManagerFactory emf = Persistence.createEntityManagerFactory("access", System.getProperties());
        em = emf.createEntityManager();

but not help.

Christian Schneider · Answer 1 · 2016-03-04T11:21:48.490

1

In Aries JPA 1.x that does not work.

In Aries JPA 2.x you can use exactly the same code as in spring. See TaskServiceImpl.java. You just need to add the jpa:enable and jta:enable elements to you blueprint context to activate the functionality.

Alternatively you can use the blueprint-maven-plugin to generate the whole blueprint.xml from annotations. Btw version 1.3.0 should be fine. You do not need the snapshot.

Thanks for the configuration snippets. The problem is that you use the wrong namespace for jpa. Try these:

xmlns:jpa="http://aries.apache.org/xmlns/jpa/v2.0.0"
xmlns:tx="http://aries.apache.org/xmlns/transactions/v1.2.0"

edited Mar 04 '16 at 11:21

answered Mar 04 '16 at 06:25

Christian Schneider

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my BaseJpaDao is Generic and Abstract - it normaly? – user5620472 Mar 04 '16 at 06:49
if I added IDE say me that this line is wrong – user5620472 Mar 04 '16 at 06:53
You also need the namespace settings from the header of the example. – Christian Schneider Mar 04 '16 at 07:11
Error while fetching http://aries.apache.org/xmlns/transactions/v1.2.0 I have Error while fetching http://aries.apache.org/xmlns/transactions/v1.0.0 and I can not change version? where it? – user5620472 Mar 04 '16 at 07:16
when i past this link in browser http://aries.apache.org/xmlns/transactions/v1.2.0 I have error Not Found – user5620472 Mar 04 '16 at 07:23
Normally the namespace urls resolve to the xsds. I will try to fix the problem. It should work fine without the xsd though. The ide might show an error but it should still work at runtime. – Christian Schneider Mar 04 '16 at 07:30
I tried but my @PersistenceContext(unitName = "access") EntityManager entityManager; IS NULL(((( – user5620472 Mar 04 '16 at 07:39
If you get null then the class is not processed correctly by aries. Can you post a small example of how you do this in github or similar. I guess you have a config error somewhere. – Christian Schneider Mar 04 '16 at 08:43
it is my configs http://pastie.org/10747510 it is my clases http://pastie.org/10747507 – user5620472 Mar 04 '16 at 09:03
I use transactions/v1.2.0 and jpa/v2.0.0 now but not help. when I added @Transactional my bundle not start – user5620472 Mar 04 '16 at 11:34
Let us [continue this discussion in chat](http://chat.stackoverflow.com/rooms/105364/discussion-between-christian-schneider-and-user5620472). – Christian Schneider Mar 04 '16 at 11:37

How get EntityManager in OSGI in Abstract Class?(like spring @PersistenceContext)

1 Answers1