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If you specify a version other than 3.0 (e.g., 2.1), then the EJB container will assume the EJB module is an older version and won t scan for annotations. This means it won t detect EJB 3 beans, or detect the persistence unit containing entities packaged in the EJB module. Make sure that version is either set to 3.0 or not specified at all.
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Migrating to EJB 3
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14.1.2 Invoking EJB 2 from EJB 3
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You can invoke EJB 2 session or entity beans from EJB 3 session beans or MDBs. You can even use dependency injection to invoke an EJB 2 bean. To illustrate the latter, assume that you have an EJB 2 bean (ChargeCredit) that charges a credit card. Use the @EJB annotation to inject an instance of a home object for ChargeCredit in an EJB 3 POJO like this:
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@Stateful public PlaceOrderBean implements PlaceOrder { .. @EJB public ChargeCreditHome creditHome; .. void chargeCreditCard(){ ... ChargeCredit chargeCredit = creditHome.create(); String confirmationNo = chargeCredit.add(billingInfo, amount); .. }
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ChargeCredit and ChargeCreditHome are the remote and home interfaces, respectively, of ChargeCreditEJB. Use the create method to get a reference to the remote interface, and then invoke the desired business method (in this case add) on the bean. As you can see from this example, EJB 3 supports the EJB 2 concepts,
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and the programming model is straightforward. If, instead of calling an EJB 2 session bean you d like to invoke an EJB 2 CMP entity bean from EJB 3, you d follow a similar approach to the previous example. Assume that ActionBazaar used EJB 2 CMP entity beans for its persistence tier. The specific case we ll discuss is one in which the PlaceBid EJB persists the Bid bean as follows:
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@Stateless public PlaceBidBean implements PlaceBid { ... @EJB public BidLocalHome bidLocalHome; ... BidLocal bidLocal = bidLocalHome.create(BidDTO); ... }
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In this example, we create a bean instance (BidDTO) by using a data transfer object (DTO). We ll discuss the DTO design pattern in section 14.3, but essentially the
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Backward compatibility and interoperability with EJB 2
DTO is used to transfer business object state, not necessarily behavior, across
application tiers. Recall that creating an entity bean instance will ask the container to persist the bean instance in the database. That covers calling EJB 2 from EJB 3, but what about the other way around Read the next section to solve this mind-numbing mystery actually, there s nothing mind-numbing about it it s almost as simple as what we just covered. Go ahead see for yourself.
14.1.3 Using EJB 3 from EJB 2
You can use both EJB 3 session beans and the EJB 3 JPA from EJB 2 applications. Although there were some discussions in the EJB 3 Expert Group on adding support for dependency injection for EJB 2 style beans, the EJB 3 spec does not require support for injection with EJB 2 (although some vendors may decide to provide it). If your server does not support EJB 2 dependency injection, you must use good old-fashioned JNDI lookup to access EJB 3 session beans and the EJB 3 EntityManager from EJB 2 beans. This is shown in figure 14.1.
Figure 14.1 It is possible to use EJB 3 beans as well as the JPA EntityManager in EJB 2 by looking them up from the JNDI context.
The method is similar to using EJB 3 beans or JPA using JNDI lookup (which we discussed in chapter 12). Using EJB 3 session beans from EJB 2 Pretend for a moment that the PlaceBid EJB is an EJB 2 session bean that invokes CheckCredit in a partner application, KabadiBazaar, but that CheckCredit is an EJB 3 session bean. You must have an ejb-ref or ejb-local-ref element in the ejb-jar.xml to establish the reference to the CheckCredit EJB as follows:
Migrating to EJB 3
<session> <ejb-name>PlaceBidBean</ejb-name> <home>actionbazaar.buslogic.PlaceBidHome</home> <remote>actionbazaar.buslogic.PlaceBid</remote> <ejb-class>actionbazaar.buslogic.PlaceBidBean</ejb-class> <session-type>stateless</session-type> ... <ejb-local-ref> <ejb-ref-name>ejb/CheckCredit</ejb-ref-name> <ejb-ref-type>Session</ejb-ref-type> <local>kabadibazaar.buslogic.CheckCredit</local> <ejb-link>kabadibazaar-ejb.jar#CheckCreditBean</ejb-link> </ejb-local-ref> </session>
The only difference between the standard deployment descriptor and this one is that the ejb-local-ref element does not have a local-home element. This is because the EJB 3 session bean does not require a home interface. In your application you can use JNDI to look up remote beans with ref-name as follows:
public class PlaceBidBean implements SessionBean { //EJB 2 bean ... public void addBid(Bidder user, double amount) { CheckCredit checkCredit = (CheckCredit) JNDI lookup context.lookup("java:comp/env/ejb/CheckCredit"); checkCredit.addBid(user, amount); } @Stateless public class CheckCreditBean implements CheckCredit{//EJB 3 bean}
The JNDI lookup is identical whether you re using EJB 2 or EJB 3. Using the EJB 3 JPA from EJB 2 You can use either a container- or an application-managed EntityManager in your EJB 2 beans. Assume that ActionBazaar migrated only the persistence tier to JPA. To use the container-managed EntityManager from an EJB 2 bean, you d define the persistence-context-ref for the EJB 2 bean as follows:
<session> <ejb-name>PlaceBidBean</ejb-name> ... <persistence-context-ref> <persistence-context-ref-name> ActionBazaarEntityManager </persistence-context-ref-name> <persistence-unit-name>actionBazaar</persistence-unit-name> </persistence-context-ref> </session>
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