310-092 Sun Cert Bus Component Developer Java EE Platform 5, Upgrade Practice Exam

Demo Question 1.

OldBarBean is a stateless session bean written to the EJB 2.1 API with remote home interface. OldBarHome and remote component interface OldBar. FooBean is a stateless session bean written to the EJB 3.0 API. OldBarBean and FooBean are the only EJBs packaged in the ejb-jar. The FooBean portion of the ejb-jar.xml also declares an ejb-ref whose ejb-ref-name is ejb/oldBar. The ejb-ref is linked to OldBarBean. There are no other ejb dependencies defined. A business method foo in FooBean needs to access OldBarBean. Which is portable code to achieve this goal?

A. @Remote private OldBar oldBar;
B. public void foo() { try { InitialContext ic = new InitialContext(); Object obj = ic.lookup("ejb/oldBar"); OldBarHome oldBarHome = (OldBarHome) PortableRemoteObject.narrow(obj, OldBarHome.class); OldBar oldBar = oldBarHome.create();
C. @EJB private OldBarHome oldBarHome; public void foo() { try { OldBar oldBar = oldBarHome.create();
D. public void foo() { try { InitialContext ic = new InitialContext(); OldBarHome oldBarHome = (OldBarHome) ic.lookup("ejb/oldBar"); OldBar oldBar = oldBarHome.create();


Display Answer

Answer: C

Explanation: