1Z0-898 試験問題を無料オンラインアクセス

A developer has created a deep entity class hierarchy with many polymorphic relationships between entitles. Which inheritance strategy, as defined by the inheritanceType enumerated type, will be most performed in this scenario?

• A.Table-per-concrete-class (inheritanceType.TABLE_PER_CLASS)
• B.Polymorphic join table (inheritanceType. POLYMORPHIC_JOIN_TABLE)
• C.Joined-subclass (inheritanceType. JOINED)
• D.Single table-per-class-hierarchy (InheritanceType.SINGLE_TABLE)

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 @mapsId (name = "name") map <String, Employee> employees;
• B.@OneToMany @MapKeyJoinColumn (name = "name") map <String, Employee> employees;
• C.@OneToMany (targetEntity = Employee.class)
  @MapKeyClass (string.class)
  map employees;
• D.@OneToMany @mapKey (name, "name") map < integer, Employee> Employees;

An application creates a TypedQuery object to perform a query, and sets the query object's flush mode by calling setFlushMode (FlushModeType.commit). The query is executed within a transaction.
Which of the following is true?

• A.Updates to the database tables may occur anytime during the transaction associated with the query.
• B.setFlushMode cannot be called on a TypedQuery object.
• C.Changes to the entities in this transaction cannot be flushed to the database until the transaction commits.
• D.Updates to the entities that can affect the outcome of the query cannot be flushed to the database until the transaction commits.

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?

• A.@Inheritance (strategy = TABLE_PER_CLASS)
• B.@TablePerClass
• C.@SingleTable
• D.@Joined
• E.@Inheritance (strategy = JOINED)
• F.@Inheritance (strategy = SINGLE_TABLE)

A JavaEE application is packaged as follows.

Which of the following is true for a portable JavaEE application?

• A.Code in the ejb1.jar can access "MyPU" defined under war1.war using "war1#myPU"
• B.This is an invalid application. A JavaEE application cannot have more than one persistent with same name.
• C."MyPu" defined under each module is visible to only the defining module. There is no way other modules can access it.