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2021 Sep 1Z0-898 sample question
Q31. A developer wants to write a type-safe Criteria API query. Which two of the following statements true about Criteria query roots? (Choose two)
A. The query MUST define a query root.
B. The query MUST define a query root only if it navigates to related entities.
C. The query MUST NOT define multiple query roots.
D. The query may define multiple query roots.
Q32. An application has two entities, parson and Address.
The application calls the DeletePersonsByStatus named query.
Which of the following is true?
A. The person entities are removed, but NOT their related address entities.
B. The person entities, and all their related address entities, are removed.
C. The DeletePersonsByStatus named query is ill-formed, and will be rejected by the persistence provider.
D. The named query will fall.
Q33. If an application uses an extended persistence context, which of the following is true?
A. The persistencecontext exists until all transactions invoked by the EntityManager complete.
B. The persistence context exists until all transactions invoked by the EntityManagar complete and the EntityManager.clear () method is invoked.
C. The persistence context exists until the EntityManagerinstance is closed.
D. The persistence context exists until the EntityManagerFactory instance is closed.
Q34. A developer wants to create a Java Persistence query that will include a subquery.
Which three are true? (Choose three.)
A. Subqueries can be used in a FROM clause.
B. Subqueries can be used in a WHERE clause.
C. The ANY expression can be used only with a subquery.
D. The EXISTS expression can be used only with a subquery.
E. The MEMBER expression can be used only with a subquery.
Q35. The developer is creating a Java Persistence model for a legacy database. The database contains customer and subscriptions.
The subscriptions table has a foreign key to the Customer table, a foreign key to the magazines table, and a column that stores a java.util.Date (the subscription expiration date).
The developer wants to create entities Customer and subscription to model these tables and to represent the relationship between customer and subscription as a java.util.Map.
Which one of the following fields of the Customer entity accomplishes this task?
@joinColumn (name = “Customer - FK”)
Map <Magzine, Data> subscriptions;
Map <Magzine, Data> subscriptions
@JoinTable (name = “Subscriptions”)
Map <Magzine, Data> subscriptions;
@CollectionTable (name = “subscriptions”)
Map <Magazine, Data> subscriptions
@CollectionTable (Name = “Subscriptions”)
Map<magazine, date> subscriptions
Up to date 1Z0-898 practice test:
Q36. The department entity has a unidirectional OneToMany relationship to the employee entity. The developer wants to model this relationship as a java.util.map such that the key of map is true employee name. The primary key of the Employees entity is empId, an integer.
Which of the following is correct?
A. @OneToMany (targetEntity = Employee.class)
B. @OneToMany @mapKey (name, “name”) map < integer, Employee> Employees;
C. @OneToMany @MapKeyJoinColumn (name = “name”) map <String, Employee> employees;
D. @OneToMany @mapsId (name = “name”) map <String, Employee> employees;
Q37. It a Persistence application locks entity x with a pessimistic lock, which statement is true?
A. Persistence provider can defer obtaining the lock until the next synchronization of an entity to the database.
B. A Persistenceprovider will obtain the lock when the entity is refreshed from the database.
C. A Persistence provider is not required to support the LockModeType. PESSIMISTIC_WRITE locking type.
D. If a lock cannot be obtained, the Persistence provider must throw an exception.
Q38. A JavaEE application is packaged as follows.
Which of the following is true for a portable JavaEE application?
A. This is an invalid application. A JavaEE application cannot have more than one persistent with same name.
B. “MyPu” defined under each module is visible to only the defining module. There is no way other modules can access it.
C. Code in the ejb1.jar can access “MyPU” defined under war1.war using “war1#myPU”
Q39. Given the following stateless session bean implementation classes:
Assuming no other transaction-related metadata, what are the transaction attributes on methodB, and methodC respectively?
A. MANDATORY, MANDATORY, and MANDATORY
B. REQUIRED, MANDATORY, andREQUIRES_NEW
C. MANDATORY, MANDATORY, <and REQUIRES__NEW
D. REQUIRED, REQUIRES_NEW, and REQUIRES_NEW
Q40. Refer to the Exhibit.
A developer wants to have bookingdata stored in the table BOOKING, flightnumber in table FLIGHTBOOKING, and hotel name in HOTELBOOKING.
Which code, inserted at line 11 of class Booking, is appropriate for his strategy?
D. @Inheritance (strategy = JOINED)
E. @Inheritance (strategy = SINGLE_TABLE)
F. @Inheritance (strategy = TABLE_PER_CLASS)