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Braindumps for "310-091" Exam

Sun Certified Business Component Developer for the Java Platform, Enterprise Edition 5

 Question 1.
Given the following stateful session bean:
10. @Stateful
11. @TransactionAttributefJransactionAttributeType. SUPPORTS)
12. public class VideoBean implements Video {
13. // insert code here
14. public void methodAO {}
15.}

Assuming no other transaction-related metadata, which code can be added at Line 13 to guarantee that business method methodA will execute only if invoked with an active transaction?

A. @TransactionAttributefJ
B. @TransactionManagement(TransactionAttributeType. CONTAINER)
C. @TransactionAttribute(TransactionAttributeType. MANDATORY)
D. @TransactionAttributeO"ransactionAttributeType.REQUIRES_NEW)

Answer: C

Question 2.
Given the following client-side code that makes use of the session bean Foo:
10. @EJB Foo beanl;
11. @EJB Foo bean2; //more code here
20. booleantestl = beanl.equals(beanl);
21. booleantest2 = beanl.equals(bean2);

Which two statements are true? (Choose two.)

A. If Foo is stateful, testl is true, and test2 is true.
B. If Foo is stateful, testl is true, and test2 is false.
C. If Foo is stateless, testl is true, and test2 is true.
D. If Foo is stateful, testl is false, and test2 is false.
E. If Foo is stateless, testl is true, and test2 is false.
F. If Foo is stateless, testl is false, and test2 is false.

Answer: B, C

Question 3.
Which statement about entity manager is true?

A. A container-managed entity manager must be a JTA entity manager.
B. An entity manager injected into session beans can use either JTA or resource-local transaction 
    control.
C. An entity manager created by calling the EntityManagerFactory.createEntityManager method 
    always uses JTA transaction control.
D. An entity manager obtained through resource injection in a stateful session bean can use a 
    resource-local EntityTransaction for transaction control

Answer: A

Question 4.
Which statement is true about the use of a persist operation in a transaction?

A. If a user persists a detached object it always becomes managed.
B. The persist operation on an entity always cascades to its related entities.
C. If a user persists a new entity with an existing primary key the transaction will fail.
D. If a user persists a managed entity an exception may be thrown by the persist operation.

Answer: C

Question 5.
A developer writes a stateless session bean with one local business interface and with container managed transactions. All business methods have transaction attribute REQUIRED. The bean has an injected field sessionCtx of the type SessionContext. 

Which two operations are allowed in a business method of the bean? (Choose two.)

A. sessionCtx. getEJBObject
B. sessionCtx.setRollbackOnly
C. sessionCtx. getMessageContext
D. sessionCtx. getBusinessObject
E. sessionCtx. getEJBLocalObject

Answer: B, D

Question 6.
A developer implements a session bean with a method doStuff which behaves differently depending on the caller's security role. Only users in security roles "ADMIN" and "USER" are allowed to call the method. Assume that there is no security-related metadata in the deployment descriptor. 

Which two, taken in combination, are appropriate to accomplish this? (Choose two.)

A. Annotate method doStuff with @PermitAII.
B. Annotate method doStuff with @RolesAllowed({"ADMIN","USER"})
C. If EJBContext.getCallerPrincipal returns role "ADMIN", implement the behavior for users in role 
    ADMIN.
D. If EJBContext.isCallerlnRole("ADMIN") returns true, implement the behavior defined for users 
    In role "ADMIN".

Answer: B, D

Question 7.
Which Java Persistence query uses the aggregate function correctly, assuming that chairs field is of type int?

A. SELECT ANY(r. chairs) FROM Room r
B. SELECT NEW Integer(MAX(r. chairs)) FROM Room r
C. SELECT r FROM Room r WHERE r.chairs > AVG(r.chairs)
D. SELECT c FROM Chair c WHERE LOCATE (c.type, lazyboy) > -1

Answer: B

Question 8.
Given:
11. ©Entity public class X{
12. @ld 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

Question 9.
A developer creates a stateless session bean. This session bean needs data from a remote system. Reading this data takes a long time. Assume that the data will NOT change during the lifetime of the bean and that the information to connect to the remote system is defined in JNDI.

Which statement describes how to manage the data correctly?

A. Read the data in the bean's constructor.
B. The data can only be read in the bean's business methods.
C. Read the data in a method which is annotated with @PrePassivate.
D. Read the data in a method which is annotated with @Post Activate.
E. Read the data in a method which is annotated with (5)PostConstruct.

Answer: E

Question 10.
An enterprise bean has security permissions set up using declarative security features. Under which two conditions can a client be guaranteed to have permission to invoke a business method on the enterprise bean? (Choose two.)

A. The Application Assembler has marked the enterprise bean method as unchecked.
B. The client's principal has been assigned a security role with permission to invoke the method.
C. The Application Assembler has set the security-identity deployment descriptor to run-as.
D. The Application Assembler has mapped all security role references using the role-link element.

Answer: A, B



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