Given:
11.
@PersistenceContext EntityManager em;
12.
public boolean test(Order o) {
13.
boolean b = false;
14.
o = em.merge(o);
15 em.remove(o);
16.
o = em.merge(o);
17.
b = em.contains(o);
18.
return b;
19.}
Which statement is correct?
A. The method will return TRUE.
B. Themethod will return FALSE.
C. Themethodwill throw an exception.
D. TheOrder instance willberemoved from the database.
Which two statements are correct about EJB 3.0 stateful session beans and stateless session beans? (Choose two.)
A. Both can have multiple remote and local business interfaces.
B. Both can be passivated by the EJB container to preserve resources.
C. Both can choose to implement the javax.ejb.SessionSynchronization interface.
D. Only the stateful session bean class is required to implement java.io.Serializable.
E. Both bean classes can have the field injection of javax. persistence. EntityManager.
A developer writes two session beans which cooperate. The first session bean, ShoppingCart, collects orders and is implemented as a stateful session bean. The second session bean, CalculateDiscount, is implemented as a stateless session bean and runs on a different server. ShoppingCart contains the method getTotalPrice, which calculates the total price of the order in the ShoppingCart, including discounts. Discounts are calculated by CalculateDiscount using the information on the ShoppingCart bean, combined with data from a database. Which scenario can accomplish this?
A. The CalculateDiscount offers a method calculate which is invoked by the ShoppingCart bean passing the this reference.
B. The CalculateDiscount offers a method calculate which is invoked by the ShoppingCart bean. CalculateDiscount accesses the ShoppingCart instance by JNDI lookup.
C. The CalculateDiscount offers a method calculate which is invoked by the ShoppingCart bean passingitsreference obtained from the SessionContext.getBusinessObject method.
D. The CalculateDiscount offers a method calculate which is invoked by the ShoppingCart bean. CalculateDiscount accesses the state of ShoppingCart by dependency injection.
Which statement is true about both stateful session beans and stateless session beans?
A. Bean instances are NOT required to survive container crashes.
B. Any bean instance must be able to handle concurrent invocations from different threads.
C. A bean with bean-managed transactions must commit or roll back any transaction before returning from a business method.
D. The container passivates and activates them using methods annotated with @PrePassivate and @PostActivate annotations.
Your application uses the Java Persistence API to access a database. This application must reject adding an instance to the database if it does NOT pass validation tests for values of two persistence properties. The database contains some data that will NOT pass such validation. Only the new records must be validated. Which option will achieve this behavior?
A. Add validation logic tothesetter methods for each property.
B. AddthePrePersist callbackmethodwithallofthevalidation logic.
C. Addthe PostPersist callback methodwithall ofthevalidation logic.
D. AddPrePersist and PreUpdate callback methods with allofthe validation logic.
Given:
11.
@PersistenceContext EntityManager em;
12.
public boolean test(Order o) {
13.
boolean b = false;
14.
o = em.merge(o);
15 em.remove(o);
16.
o = em.merge(o);
17.
b = em.contains(o);
18.
return b;
19.}
Which statement is correct?
A. The method will return TRUE.
B. Themethod will return FALSE.
C. Themethodwill throw an exception.
D. TheOrder instance willberemoved from the database.
A developer creates a stateful session bean that is used by many concurrent clients. The clients are written by other development teams and it is assumed that these clients might not remove the bean when ending their session. The number of concurrent sessions will be greater than the defined bean cache size. The developer must consider that the state of the session bean can be influenced by either passivation or timeout. Which three actions should the developer take to make the bean behave correctly in passivation and timeout situations? (Choose three.)
A. Release references to resources ina@Removeannotated method.
B. Re-establish references to resources in an @lnit annotated method.
C. Release references to resources ina@PreDestroy annotated method.
D. Release references to resources in a @PrePassivate annotated method.
E. Re-establish referencestoresources ina (©PostActivate annotatedmethod.
Which two options can be used to predefine Java Persistence queries for easy use? (Choose two.)
A. @NamedQuery annotation
B. @NamedNativeQuery annotation
C. using the named-query element in the XML descriptor
D. usingthenamed-native-queryelementintheXML descriptor
A developer wants to create a business interface for both local and remote usage. For performance reasons the remote interface should NOT be called by a client in the same JVM. Which statement is required to accomplish this, assuming there is no deployment descriptor?
A. The business methods are defined in one interface which must be annotated with both @Local and @Remote.
B. The business methods are defined twice in one interface. One method is annotated with @Local and the other is annotated with @Remote.
C. The business methods are defined in a common interface by two other interfaces which are annotated with @Local and @Remote respectively. The bean implements the super interface.
D. The business methods are defined in a common interface. It is extended by two interfaces, annotated with @l_ocal and @Remote respectively. Both interfaces are implemented by the bean class.
The Java Persistence API defines the semantics of the remove operation and the entity lifecycle states. Which statement is true when the remove method is invoked on an entity X?
A. If X is a removed entityitbecomes managed.
B. If X isanew entity it willberemoved fromthe database.
C. The remove method is always cascaded to related entities.
D. IfX isadetached entity an HlegalArgumentExceptionwillbethrown.
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