EJB3 CORRUPTED when using more than one PersistenceUnit

Question

Hi,
I am using JSF, EJB3 on Glassfish. CMP and JTA.
This is the scenario:
A user logs into application choosing one Persistence Unit (like in JavaSE). This is only at the beginig as I want to use Glassfish CMP and JTA.
    public EntityManagerFactory getEmf() throws Exception {
        configOverrides = new HashMap<String,Object>();
        configOverrides.put(TARGET_DATABASE,TargetDatabase.SQLServer);
        configOverrides.put(TARGET_SERVER,TargetServer.SunAS9);
        configOverrides.put(JTA_DATASOURCE,"jdbc/"+puName);
        configOverrides.put(SESSION_NAME,puName+"_session");
        emf = Persistence.createEntityManagerFactory(puName,configOverrides);
        return emf;
    }I then put the corresponding PersistenceUnit name in http Session scope to be used later on.
I created a CommonEjbImpl to further inject via Jndi (and therefore use CMP and JTA) an EntityManger in each EJB3 as follows:
@PersistenceContexts({
   @PersistenceContext(name="pu/SOCIETE1", unitName="SOCIETE1"),
   @PersistenceContext(name="pu/SOCIETE2", unitName="SOCIETE2"),
   @PersistenceContext(name="pu/SOCIETE3", unitName="SOCIETE3"),
   @PersistenceContext(name="pu/SOCIETE4", unitName="SOCIETE4"),
   @PersistenceContext(name="pu/SOCIETE5", unitName="SOCIETE5"),
   @PersistenceContext(name="pu/GENESYS_EXEMPLE", unitName="GENESYS_EXEMPLE")
public class CommonEjbImpl {
    public EntityManager initEm() {
        LogUtil.log(this.getClass(),(String)FacesContext.getCurrentInstance().getExternalContext().getSessionMap().get("database"));
        return initEm((String)FacesContext.getCurrentInstance().getExternalContext().getSessionMap().get("database"));   
    public EntityManager initEm(String puName) {
        EntityManager em = null;
        try {
            em = (EntityManager) new InitialContext().lookup("java:comp/env/pu/"+puName);
        } catch (NamingException ex) {
            LogUtil.error(this.getClass(),ex);
        return em;   
    public void cleanup(EntityManager em) {
        //LogUtil.log(this.getClass(), "CLEANING EJB..with em: "+em);
        if (em != null && em.isOpen()) {
            em.close();
    } And in each EJB3, I use this CommonEjBImpl to get the Entity Manager like this:
@Stateless
public class TreeEJB extends CommonEjbImpl implements TreeEJBLocal {
    public TreeEJB() {
    private EntityManager em;
    @PostConstruct
    public void init() {
        em = super.initEm();
    @PreDestroy
    public void cleanup() {
        super.cleanup(em);
}I have also a JSF backing bean (in SESSION SCOPE) "TreeBean" in which i Inject an EJB3 like this:
    <managed-bean>
        <managed-bean-name>TreeBean</managed-bean-name>
        <managed-bean-class>com.mfpsoft.bean.tree.TreeBean</managed-bean-class>
        <managed-bean-scope>session</managed-bean-scope>
    </managed-bean>and:
public class TreeBean extends BeanLoader {
    public TreeBean() {
    @EJB
    private TreeEJBLocal treeEJB;
    @PostConstruct
    public void init() {
        treeEJB.init();
}SO, imagine what is happening:
USER1 logs (a persistence unit)
USER2 logs (a different persistence unit)
USER1 refresh tree for example
USER2 rehresh tree also
==> USER2 GETS data from USER1 persitence unit
My questions:
EJB3 refrence seems to in application scope. Is thereonly one EJB3 refrence per appication?
If so, how can I use same EJB with different persistence COntexts at the same time.
Would this be a workaround ?? get entityManager at each business method of the EJB like this
    public  Object Method(Object object) throws Exception {
        EntityManager em = super.initEm();
        try {
            ...//em operations
        } catch (Exception ex) {
        } finally {
           em.close();
    }Would the data be corrupted if simultaneous access to same method by diffrent users?
This issue is quite URGENT
I would really appreciate a quick help on this
Many thanks in advance
Nicog

Answer 1

Hi Zsom,
Thanks for your answer
Let me explain more clearly.
My architecture is as follows: using JSF, Glassfish and ...SQL Server!! (! i know but this is mandatory requirement as our application is full web version of an existing ERP application already sold and installed by more than 1000 of our customers...
I am using
JSF-->JSF Managed Bean (Session for some and Request for almost all when logged )-->EJB Interface-->EJB Impl-->Entity-->Database
Our application is ERP that our customers uses to managed several companies simultanously .
This product ,mainly for intranets, is delivered with glassfish, the web application and SQL server containing by default 5 databases SOCIETE1,...SOCIETE5...but more can be created by our consultants for this customer....
All databases have the same schema but not the same data.
Sincerely, if I had done the desgin of the database, for sure I would have put all SOCIETEn in one DB but this is historical and I cant do anything against it.
You have to see in our case, a database as a company of our customer (a joint venture for instance), each of which  with particular configuration, customers, orders, invoices, contacts....
I have a persistence Unit (using JTA and CMP) per database , each using a connection pool managed by Glassfish.
At the login of my application, the user (a user of our cutomer that bought this product), choose a database (a company actually lets say SOCIETE1), ...enter logging info and connect.
The user must also be able to launch another browser window and connect lets say to SOCIETE2, and then work on SOCIETE1 AND SOCIETE2 simultanously.
Also, I need Session Scope as there is configuration data that I need to keep over all pages. This configuration data is depending on the database connected to and the user.
A session is therefore linked to the pair USER+DATABASE
When selecting the database (company) for combo in logging form, the only way I found is fisrt to check if database(company) exists and can be connect to using at first begining Persistence.CreateEntityMangerFactory.. (i know that this is not J2EE and CMP but merly used in Java SE environments..).
This step is only used for checking database.
Then, if creation did not generate a Persistence Exception , I can use CMP and an EnityManger in EJB by JNDI lookup (as DI is not possible because you need constant in unitName);
Doing so, the EJB (which only handles actions on Entities) manage the entities of the corresponding company SOCIETE1 or SOCIETE2, or.....
I know that I might use antipatterns here, but actually this is the only solution I found
Would an extra Layer between JSF bean and EJB do the trick....if yes how to inject the good persistence unit in my EJB is still in question.
More if one Persistence unit is injected (assuming EJB being stateless) and another user working on another persistence unit is using the same EJB, then I go back in my first message on this topic
As the number of databases for a customer is unknown, I can not create an EJB par database (lets says EJB_SOCIETE1, EJB_SOCIETE2,...). I agree that in this case they would be stateless....
Do you have any suggestion to repect patterns in this situation.
This would be greatly appreciated
Thanks again
Nicolas