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[jsr338-experts] Re: Inheritance of Extended Persistence Context

  • From: Scott Marlow <smarlow@...>
  • To: jsr338-experts@...
  • Cc: Linda DeMichiel <linda.demichiel@...>, michael keith <michael.keith@...>
  • Subject: [jsr338-experts] Re: Inheritance of Extended Persistence Context
  • Date: Fri, 01 Jun 2012 13:15:59 -0400


On 06/01/2012 12:47 PM, Linda DeMichiel wrote:


On 6/1/2012 9:25 AM, michael keith wrote:
Assuming the DAO interface is local and does not have a @Remote on it,
and also assuming that there is just a forgotten
injection annotation of
@PersistenceContext(type=PersistenceContextType.EXTENDED) on the EM in
TestService, then the PC
should be inherited by both SFSBs DAO1 and DAO2. If the session beans
are local then you should not leave the EJB
container instance.
(Does that answer the question?)


Yes, agree.

Scott, was TestService intended to have a transaction-scoped or an
extended persistence context?

For the purpose of this question, lets remove the entity manager from TestService. I should of removed that before.


@Stateful
@Remote(TestService.class)
public class TestSFSB implements TestService {

    @EJB(beanName = "DAO1") private DAO dao1;
    @EJB(beanName = "DAO2") private DAO dao2;

    public String testfunc() {
        dao1.myFunction();
        dao2.myFunction();
        return "fine";
    }
}

@Stateful
public class DAO1 implements DAO {
    @PersistenceContext(type=PersistenceContextType.EXTENDED)
    private EntityManager entityManager;

    public void myFunction() {
        entityManager.find(PersonOrm.class, 123L);
        System.out.println("DAO1:" + entityManager);
    }
}

@Stateful
public class DAO2 implements DAO {
    @PersistenceContext(type=PersistenceContextType.EXTENDED)
    private EntityManager entityManager;

    public void myFunction() {
        entityManager.find(PersonOrm.class, 123L);
        System.out.println("DAO2:" + entityManager);
    }
}



On 01/06/2012 11:50 AM, Scott Marlow wrote:
In the interest of ensuring EE application portability, I'd like to
change or add additional wording to the JPA 2.1
"7.6.3.1 Inheritance of Extended Persistence Context" section.

In the following example, instances of beans TestSFSB, DAO1, DAO2
will be "executing in the same EJB container
instance" (PostConstruct for { TestSFSB, DAO1, DAO2} should execute
in the same EJB container instance). One question
that I have, is there a possibility for { TestSFSB DAO1, DAO2} to not
execute in the same EJB container instance? Is
that EJB container implementation specific?

@Stateful
@Remote(TestService.class)
public class TestSFSB implements TestService {
private EntityManager entityManager;

@EJB(beanName = "DAO1") private DAO dao1;
@EJB(beanName = "DAO2") private DAO dao2;

public String testfunc() {
dao1.myFunction();
dao2.myFunction();
return "fine";
}
}

@Stateful
public class DAO1 implements DAO {
@PersistenceContext(type=PersistenceContextType.EXTENDED)
private EntityManager entityManager;

public void myFunction() {
entityManager.find(PersonOrm.class, 123L);
System.out.println("DAO1:" + entityManager);
}
}

@Stateful
public class DAO2 implements DAO {
@PersistenceContext(type=PersistenceContextType.EXTENDED)
private EntityManager entityManager;

public void myFunction() {
entityManager.find(PersonOrm.class, 123L);
System.out.println("DAO2:" + entityManager);
}
}


Text from the JPA 2.0 specification:

"
7.6.2.1 Inheritance of Extended Persistence Context

If a stateful session bean instantiates a stateful session bean
(executing in the same EJB container instance) which
also has such an extended persistence context, the extended
persistence context of the first stateful session bean is
inherited by the second stateful session bean and bound to it, and
this rule recursively applies—independently of
whether transactions are active or not at the point of the creation
of the stateful session beans.
"

Text from the JPA 2.1 specification:

"
7.6.3.1 Inheritance of Extended Persistence Context
If a stateful session bean instantiates a stateful session bean
(executing in the same EJB container instance) which
also has such an extended persistence context with the same
synchronization type, the extended persistence context of
the first stateful session bean is inherited by the second stateful
session bean and bound to it, and this rule
recursively applies—independently of whether transactions are active
or not at the point of the creation of the
stateful session beans. If the stateful session beans differ in
declared synchronization type, the EJBException is
thrown by the container.
"

Depending on the answer to my first question, I'd like to add
clarifying text (to the JPA 2.1 7.6.3.1 section) that
makes it more obvious whether DAO1 + DAO2 (which could execute in the
same EJB container) will inherit the same
extended persistence context. I'll try to make some suggestions after
we have answered these questions as to whether
DAO1 + DAO2 will always execute in the same EJB container.

Scott





[jsr338-experts] Inheritance of Extended Persistence Context

Scott Marlow 06/01/2012

[jsr338-experts] Re: Inheritance of Extended Persistence Context

michael keith 06/01/2012

[jsr338-experts] Re: Inheritance of Extended Persistence Context

Linda DeMichiel 06/01/2012

[jsr338-experts] Re: Inheritance of Extended Persistence Context

Scott Marlow 06/01/2012

[jsr338-experts] Re: Inheritance of Extended Persistence Context

Linda DeMichiel 06/01/2012

[jsr338-experts] Re: Inheritance of Extended Persistence Context

michael keith 06/01/2012

[jsr338-experts] Re: Inheritance of Extended Persistence Context

Scott Marlow 06/01/2012

[jsr338-experts] Re: Inheritance of Extended Persistence Context

Scott Marlow 06/01/2012

[jsr338-experts] Re: Inheritance of Extended Persistence Context

Linda DeMichiel 06/01/2012

[jsr338-experts] Re: Inheritance of Extended Persistence Context

Scott Marlow 06/07/2012

[jsr338-experts] Re: Inheritance of Extended Persistence Context

Linda DeMichiel 06/18/2012

[jsr338-experts] Re: Inheritance of Extended Persistence Context

Emmanuel Bernard 06/04/2012

[jsr338-experts] Re: Inheritance of Extended Persistence Context

Scott Marlow 06/07/2012

[jsr338-experts] Re: Inheritance of Extended Persistence Context

Werner Keil 06/07/2012
 
 
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