Which statement is true about the Timer service in an EJB 3.0 stateless session bean?
A. The timeout callback method contains the business logic that handles the timeout event.
B. The timeout callback method must be declared as a business method in business interfaces.
C. The timeout callback method can throw application exceptions to report business logic failures.
D. A bean class can implement multiple timeout callback methods, each associated with a different timer.
Which is a valid way of injecting a container-managed transaction-scoped persistence context into an EJB 3.0 session bean assuming the application contains only one persistence unit?
A. @PersistenceUnit public EntityManager em;
B. @PersistenceContext private EntityManager em;
C. @TransactionManagement(TransactionManagementType. CONTAINER) public EntityManager em;
D. @Resource(name="persistence/em", authenticationType=AuthenticationType. CONTAINER) protected EntityManager em;
A developer wants to perform programmatic access control inside EJB 3.0 session beans. This is needed because some permissions can be determined only at application runtime. Which method achieves this goal?
A. javax.ejb.EJBContext.getRollbackOnlyO
B. java.lang.SecurityManager.checkAccess(Thread t)
C. javax. interceptor. InvocationContext. getTargetO
D. javax. ejb. SessionContext.isCallerlnRole(String roleName)
E. javax. servlet. http. HttpServletRequest. getUserPrincipalQ
Given this code snippet from a JMS message-driven bean class X:
11.
public XQ { System, out. print("1 "); }
12.
public void onMessagefMessage m) throws Java. rmi. RemoteException
13.
try {
14.
TextMessage tm = (TextMessage) m;
15.
String text = tm.getText0;
16.
System, out. print("2 ");
17.
} catch (JMSException e) {
18.
throw new java. rmi. RemoteExceptionQ;
19.}
20.}
When this bean class handles a message, which is correct?
A. After a messagedelivery theresultis1.
B. Aftera message delivery the resultis2.
C. Aftera message delivery the result is12.
D. Afteramessage delivery an exception isthrown.
E. After a message delivery the resultisunpredictable.
F. This isNOTanEJB3.0 compliant bean.
FooBean is an EJB 3.0 session bean that can make valid use of UserTransaction. Which is guaranteed to work in an EJB container for FooBean to obtain the UserTransaclion object?
A. Invoke a method on a SessionContext that returns a UserTransaction object.
B. Perform JNDI lookup with name "java:/UserTransaction" on an InitialContext.
C. Perform JNDI lookup with the name "jdbc/UserTransaction" on an InitialContext.
D. Use the @TransactionManagement annotation to inject an instance variable of type UserTransaction in a bean class.
Which statement is true about the Timer service in an EJB 3.0 stateless session bean?
A. The timeout callback method contains the business logic that handles the timeout event.
B. The timeout callback method must be declared as a business method in business interfaces.
C. The timeout callback method can throw application exceptions to report business logic failures.
D. A bean class can implement multiple timeout callback methods, each associated with a different timer.
A developer wants to create a portable EJB 3.0 application that includes the following class definition for the Entity Account:
11.
©Entity
12.
@Entityl_isteners(com. acme.AlertMonitor. class)
13.
public class Account {
14.
// more code here
15.
@PrePersist
16.
protected void validateCreate0 {/* more code here */} 17.}
Which statement is correct?
A. The validateCreate method may NOT throwruntimeexceptions.
B. ThevalidateCreate method can invoke the EntityManager.flush operation.
C. Methods oftheclass com.acme.AlertMonitor annotatedwithcallback annotationsmusttake an Object or Account instance astheonly argument.
D. The above class definition is NOT correct. An entity cannot defineacallback methodlike PrePersistand use the EntityListeners annotationatthe same time.
A developer writes an enterprise application and packages it into an .ear file. The application contains two persistence units defined at the .ear level with persistence unit names FooPU and BarPU. The application also contains an ejb-jar with one stateless session bean. Which code, when added to the stateless session bean class, injects an EntityManagerFactory at runtime?
A. PersistenceUnit private EntityManagerFactory emf; B. PersistenceContext private EntityManagerFactory emf;
B. PersistenceUnit(unitName="BarPU") private EntityManagerFactory emf;
C. Resource(name="BarPU", type=EntityManagerFactory.class) private EntityManagerFactory emf;
A developer is working on a user registration application using EJB 3.0. 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.setRollbackOnlyOmethodafter registration fails.
B. Have registerUser method throw javax.ejb.EJBTransactionRequiredExceptionafterregistration fails.
C. HaveregisterUser method throw EJBException without marking the transaction for rollback, after registration fails.
D. Create an application exception withtherollbackattributeset to falseandhave registerUser method throwit afterregistration fails.
A developer creates the following session bean:
10.
©Stateless
11.
@RolesAllowed("SECRET")
12.
public class MyBean implements Mylnterface {
13.
public void methodAOJ}
14.
@PermitAII
15.
public void methodB0 {}
16.
@DenyAII
17.
public void methodC0 {}
18.
} No deployment descriptor is supplied. Which two statements are true? (Choose two.)
A. Auserin the role "SECRET" will be able to accessallof the methods.
B. A user inthe role"FOO" will be able to accessmethodAandmethodB.
C. A user withoutanyrolewill beable to accessmethodBbut NOTmethodA.
D. A user in the role "SECRET"willbe able to accessmethodA andmethodB.
E. A userintherole "SYSADM" will be abletoaccessmethodA,methodB, and methodC.
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