Online Access Free 1Z0-898 Practice Test

Persistence application locks entity x with a LockModeType. PESSIMISTIC_READ lock type, which statement is true?

• A.This operation will result in a TransactionRolledbackException if the lock cannot be obtained.
• B.LockModeType. PESSIMISTIC_READ is the synonym of the LockModeType.REA
• C.This operation will force serialization among transactions attempting to read the entity data.
• D.If the application later updates the entity, and the changes are flushed to the database, the lock will be converted to an exclusive lock.

A developer wrote an entity class with the following method:
Private static Logger logger = Logger.getLogger ("myLogger");
@PrePersist @PreUpdate Public void doA () { Logger.info ("A"); } @PostPersist @PostUpdate Public void doB () { logger.info ("B"); }
What will the log message contain when an application does the following?
1.Begins a transaction
2.Creates the entity
3.Persists the entity
4.Commits the transaction
5.Begins the entity data
6.Modifies the entity data
7.Merges the entity
8.Commits the second transaction

• A.A A B B
• B.A B A B
• C.The application will throw an exception because multiple lifecycle callback annotations applied to a single method.
• D.A B B A B

The developer wants to override the default mappings for an embeddable class Address used by the customer entity.
The Address class is defined as follows:
@Embeddable public class Address (
private String street;
private String city;
private String country;
. . .
)
Assume that NO mapping descriptor is present. Which code segment below shows the correct way to override the default mapping for address?

• A.@AttributeOverrides ({
  @AttributeOverride (name = "addr.street", column = @Column (name = ADDR_STREET)),
  @AttributeOverride (name = "addr.city", column = @Column (name = ADDR_CITY)),
  @AttributeOverride (name = "addr.country", column = @Column (name = ADDR_COUNTRY)),
  }}
  @Embedded Address addr;
• B.@ AttributeOverrides ({
  @AttributeOverride (name = "street", column (name = "name_STREET")),
  @AttributeOverride (name = "city, column (name = "name_CITY")),
  @AttributeOverride (name = "country, column (name = "name_COUNTRY")),
  }}
  @Embedded Address addr;
• C.@AttributeOverrides ({
  @AttributeOverride (name = "street", column = @Column (name = ADDR_STREET)),
  @AttributeOverride (name = "city, column = @Column (name = ADDR_CITY)),
  @AttributeOverride (name = "country, column = @Column (name = ADDR_COUNTRY)),
  }}
  @Embedded Address addr;
• D.@ AttributeOverrides ({
  @AttributeOverride (name = "street", column = @Column (name = "name_STREET")),
  @AttributeOverride (name = "city, column = @Column (name = "name_CITY")),
  @AttributeOverride (name = "country, column = @Column (name = "name_COUNTRY")),
  }}
  @Embedded Address addr;

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 only if it navigates to related entities.
• B.The query MUST define a query root.
• C.The query may define multiple query roots.
• D.The query MUST NOT define multiple query roots.

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.