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Oracle 1Z0-898 Java Platform
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Question 1 Enttt lifectcle call-back methods mat be defned in which three classes? (Choose three) A. Embedded classes B. Enttt classes C. Abstract classes D. Enttt listener classes E. Mapped super classes F. Concrete non-enttt super classes
Aoswern B,D,E Explanatonn Referencen htpn::stackooerrow.com:muestons:ns/s247:how-to-inject-a-springs-seroice-bean-intoa-jpa-enttt (See the answer, frst paragraph)
Question 2 A deoeloper wrote an enttt class with the following methodn Prioate statc Logger logger = Logger.getLogger (“mtLogger”); @PrePersist @PreUpdate Public ooid doA () { Logger.info (“A”); } @PostPersist @PostUpdate Public ooid doB () { logger.info (“B”); } What will the log message contain when an applicaton does the following? 1. Begins a transacton 2. Creates the enttt n. Persists the enttt /. Commits the transacton 5. Begins the enttt data 4. Modifes the enttt data s. Merges the enttt 7. Commits the second transacton A. A A B B B. A B
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A B C. A B B A B D. The applicaton will throw an excepton because multple lifectcle call-back annotatons applied to a single method.
Aoswern B Question 3 Gioen the following coden Public ooid create () { trt { doA () { } catch (PersistenceExcepton e) {} trt (doB) (); } catch (PersistenceExcepton e) {} } Calling method doA will cause an NonUnimueResultExcepton to be thrown. Calling method doB will cause an EntttExistsExcepton to be thrown. What two optons describe what will happen when the create method is called within an applicaton ' uses container managed transactons? (Choose two) A. Method doB will neoer be called. B. The current transacton will contnue afer doA executes. C. The current transacton will contnue afer doB executes. D. The current transacton will be marked for rollback when doA is called. E. The current transacton will be marked for rollback when doB is called.
Aoswern C,E Question 4 An applicaton that uses pessimistc locking calls an update Data method that results in a LockTimeoutExcepton being thrown. What three statements are correct? (Choose three) A. The current transacton contnues. B. The current statement contnues. C. The current transacton is rolled back. D. The current statement is rolled back. E. The LockTimeoutExcepton can NOT be caught. F. The LockTimeoutExcepton can be caught, and the update Data method retried.
Aoswern A,D,F Question 5
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A deoeloper has created a deep enttt class hierarcht with mant poltmorphic relatonships between enttles. Which inheritance strategt, as defned bt the inheritance Ttpe enumerated ttpe, will be most performed in this scenario? A. Single table-per-class-hierarcht (InheritanceTtpe.SINGLE_TABLE) B. Joined-subclass (inheritanceTtpe. JOINED) C. Table-per-concrete-class (inheritanceTtpe.TABLE_PER_CLASS) D. Poltmorphic join table (inheritanceTtpe. POLYMORPHIC_JOIN_TABLE)
Aoswern C Question 6 A deoeloper is creatng an enttt which is mapped to a table that has a primart ket constraint defned on two character columns and would like to use mapping defaults as much as possible to simplift the code. Which two mapping optons can be chosen? (Choose two.) A. Use an @id propertt that constructs a prioate feld as a concatenaton of two columns. B. Use a separate class to map those two columns and use an @idclass annotaton to denote I primart ket feld or propertt in the enttt. C. Use a separate @Embeddable class to map those two columns and use an @EmbeddedId annotaton to denote a single primart ket feld or propertt in the enttt. D. Use a separate @Embeddable class to map those two column and add two felds or propertes the enttt, each marked as @id, that correspond to the felds or propertes in the embeddable class. E. Use a separate class to map those two columns. Specift that class using @Idclass annotaton on the enttt class. Add two felds or propertes to the enttt, each marked as @Id, that correspond to the felds or propertes in that separate class.
Aoswern B,C
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