W R I T E   A N D   D E P L O Y   J 2 E E   A P P L I C A T I O N S  

of concurrent users they may have only a few SLSB available because the time elapsed of a 

call is short compared to the time waiting for the next call. 

The disadvantage of a SLSB is that the client has to maintain states and transactions 

between calls. So for local client like Web applications maintaining states can be difficult 

and for remote clients handle transactions over several calls can be costly. 

Speaking of transactions in a Bean Managed Transaction (BMT for short) SLSB any 

incoming transaction is suspended and a created transaction within the call must be 

committed or rolled back before the method returns. 

For a SLSB it is not uncomment to use one or more Entity Beans. During development the 

JNDI names of the EJBs maybe different to what they are in the production environment 

because a JNDI name is already used or there is a different naming convention. That is why 

the developer should use EJB references instead of the  public  JNDI name of the EJB. This 

allows the deployer to change the  public  JNDI name without breaking the application 

except for a remote client. The same applies also to resources like mail or datasources. In 

XDoclet another EJB is referenced by: 

* @ejb:ejb ref ejb name="test/TestEntity" 

 *              ref name="mytest/TestEntity" 

 * 

Later on it can be used this way: 

Context lContext = new InitialContext(); 

TestEntityHome lHome = (TestEntityHome) PortableRemoteObject.narrow( 

   lContext.lookup( 

      "java:comp/env/ejb/mytest/TestEntity" 

   ), 

   TestEntityHome.class 

); 

The EJB DD contains then: 

   ejb/mytest/TestEntity 

   Entity 

   test.interfaces.TestEntityHome 

   test.interfaces.TestEntity 

   test/TestEntity 

Now the deployer can adjust the JNDI names of the EJBs in the JBoss specific DD 

(jboss.xml) without changing anything else. The issue becomes a little bit trickier when an 

EJB is referenced in another application but the principle stays the same. 

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