310-091 Exam

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Exam : SUN 310-091
Title : Sun Certified Bus. Component Developer Java EE Platform 5


1. A developer is working on a user registration application using EJB 0. A business method registerUser in stateless session bean RegistrationBean performs the user registration. The registerUser method executes in a transaction context started by the client. If some invalid user data causes the registration to fail, the client invokes registerUser again with corrected data using the same transaction. Which design can meet this requirement?
A. Have registerUser method call EJBContext.setRollbackOnly() method after registration fails.
B. Have registerUser method throw javax.ejb.EJBTransactionRequiredException after registration fails.
C. Have registerUser method throw EJBException without marking the transaction for rollback, after registration fails.
D. Create an application exception with the rollback attribute set to false and have registerUser method throw it after registration fails.
Answer: D

2. Which two class types must be implicitly or explicitly denoted in the persistence.xml descriptor as managed persistence classes to be included within a persistence unit? (Choose two.)
A. Entity classes
B. Interceptor classes
C. Embedded classes
D. Entity listener classes
Answer: AC

3. Given:
11. @Entity public class X {
12. @Id int id;
13. Y y;
14. }
A public class Y with NO Java Persistence annotations is defined in the same package.
Which statement is correct about these classes if NO other annotations and mapping descriptors are provided?
A. Class Y must be serializable.
B. Class Y must be marked as an entity.
C. The entity X is not defined correctly.The field y must be marked as @Lob.
D. Class Y must be accessed by a persistence application through a public interface.
Answer: A

4. Which statement about the combination of mapping defaults, annotations, and XML descriptors is correct?
A. All mapping annotations must always be processed by the persistence provider.
B. Some annotations, like the @Entity annotation, must always be processed by the persistence provider.
C. The mapping information for an entity class specified by annotations and in XML descriptors must be distinct.
D. If multiple entity listeners are defined, the order in which they are invoked can be defined or overwritten in the XML descriptor.
Answer: D

5. Which is a valid PostConstruct method in a message-driven bean class?
A. @PostConstruct
　public boolean init() { return true; }
B. @PostConstruct
　private static void init() {}
C. @PostConstruct
　private void init() {}
D. @PostConstruct
　public static void init() {}
Answer: C

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