Question

Environment

Application server: JBoss AS7 (7.1.1 Final)

JPA implementation: EclipseLink (2.4.1)

OS: Windows 7 DB: PostgreSQL 8.4

Update 2, solved

The problem was that i instantiated the AccountService class instead of injecting it using @EJB. After fixing that EntityManager was inected correctly in the service and a transaction was available when doing em.persist(account);

Update

I made a minimal project that shows my problems. Posted to Github:

https://github.com/gotling/jboss-eclipselink-problem

I have two problems that are probably related and due to me not understanding the use of EJB’s correct.

1. I can not get EnityManager to be injected in AccountService.java in persistance JAR, resulting in NullPointerException.

2. If sending EntityManager in constructor to AccountService no tranasaction is found when doing em.persist.

Project structure

EJB

• lib/persistanceunit.jar

• web-service.war

Problem

I’m trying to get JBoss to manage transactions in my Java EE service. Problem is that EclipseLink does not seem to pick up the transaction managed by JBoss when trying to persist an entity.

I have followed the guide https://community.jboss.org/wiki/HowToUseEclipseLinkWithAS7 (Alternative 1 and Alternative 2 Step 4) on how to configure JBoss with EclipseLink.

Setup

WAR

Entity manager is injected like this in web-service.war:

@WebService(....)
public class NotificationConsumerImpl implements NotificationConsumer {
    @PersistenceContext(unitName="foo")
    EntityManager em;

    public void notify(Notify notify) {
        AccountService accountService = new AccountService(em);
        accountService.create(notify);
    }
}

There is actually a controller class between the class above and the service class, where transformation of the Account object is done, removed it to shorten code.

Persistance Unit

Entity is created like this

AccountService.java in persistanceunit.jar

@Stateless
public class AccountService {
    private EntityManager em;

    public AccountService(EntityManager em) {
        this.em = em;
    }

    public void create(Account account) {
        em.persist(account);
    }
}

Stack trace

When calling a WS that should persist the Account entity I get an exception on em.persist(account);

...
Caused by: javax.persistence.TransactionRequiredException: JBAS011469: Transaction is required to perform this operation (either use a transaction or extended persistence context)
at org.jboss.as.jpa.container.AbstractEntityManager.transactionIsRequired(AbstractEntityManager.java:692) [jboss-as-jpa-7.1.1.Final.jar:7.1.1.Final]
at org.jboss.as.jpa.container.AbstractEntityManager.persist(AbstractEntityManager.java:562) [jboss-as-jpa-7.1.1.Final.jar:7.1.1.Final]
at se.magos.service.AccountService.create(AccountService.java:50) [persistenceunit-0.0.1-SNAPSHOT.jar:]

Questions

1. I’ve enabled Trace logging. Should not id.au.ringerc.as7.eclipselinkpersistence be visible in the log?

2. Is it somehow possible to get the EntityManager injected inside the service class inside the persistanceunit.jar?

3. In which JBoss / EclipseLink version should this wor out of the box?

Answer 1

The problem was that AccountService class was instantiated instead of injected using @EJB annotation. After fixing that EntityManager was injected correctly in the service and a transaction was available when doing em.persist(account);

Before

@WebService(....)
public class NotificationConsumerImpl implements NotificationConsumer {
    @PersistenceContext(unitName="foo")
    EntityManager em;

    public void notify(Notify notify) {
        AccountService accountService = new AccountService(em);
        accountService.create(notify);
    }
}

After

@WebService(....)
public class NotificationConsumerImpl implements NotificationConsumer {
    @PersistenceContext(unitName="foo")
    EntityManager em;

    @EJB
    AccountService accountService;

    public void notify(Notify notify) {
        accountService.create(notify);
    }
}