Given two entities with one to-one association: @Entity public class Person { @Id Integer id; … } @Entity public class PersonDetail { @Id Integer id; … } Which code fragment correctly defines the detail field that PersonDetail instance in removed…
An application wants to utilize side effects of cascading entity manager operations to related entities. Which statement is correct? A. The persist operation is always cascaded to related entitles for one-to one and one-to-many relationships. B. To minimize the effect…
Given two entities with many-to-many bidirectional association between them: @Entity public class Employee { Collection projects; // more code here } and @Entity public class Project { Set<Employee> emps; // more code here } What set of annotations correctly defines…
The developer has defined the following entity class office: @Entity public class Office { @Id private int id; private String name; @OneToMany private List<Room> rooms; } Which of the following attributes will be in corresponding generated static metamodel class for…
An application that uses container-managed transaction demarcation creates a query within an active transaction and receives a QueryTimeoutException. Which of those scenarios describes what happens to the active transaction? A. The statement and the transaction continue. B. The query is…
An application uses an application-managed entity manager. Which of the following is NOT true? A. The application may specify whether the scope of the persistence context is extended. B. The application must use EntityManagerFactory instances to create entity managers. C.…
Given: @PersistenceContext EntityManager em; public boolean test(Order o) { boolean b = false; o = em.merge(o); em.remove(o); o = em.merge(o); b = em.contains(o); return b; } Which statement is correct? A. The method will return TRUE. B. The method will…
A named query that sets an exclusive pessimistic on the entities returned by the query by setting the NamedQuery lockMode element to LockModeType.PESSIMISTIC_FORCE_INCREMENT. The application starts transaction and executes the query. Which of the following statements is correct about the…
A developer has created an application managed entity manager. Which statement is correct? A. A new persistence context begins when the entity manager is created. B. A new persistence context begins when a new JTA transaction begins. C. A new…
If an application uses an extended persistence context, which of the following is true? A. The persistence context exists until all transactions invoked by the EntityManager complete. B. The persistence context exists until all transactions invoked by the EntityManagar complete…