Oracle 1Z0-900 Exam Actual Questions

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The questions for 1Z0-900 were last updated on Oct 4, 2024.

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Question No. 1

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

ALockModeType.PESSIMISTIC_READ is the synonym of LockModeType.READ

BThis operation will force serialization among transactions attempting to read the entity data.

CThis operation will result in a TransactionRolledbackException if the lock cannot be obtained.

DIf the application updates the entity later, and the changes are flushed to the database, the lock will be converted to an exclusive look.

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Correct Answer: B

Question No. 2

Which statement is true about Java methods that are exposed as Web Service operations by using JAX-WS API?

AThe @WebResult annotation must exist.

BMethod parameters and return types must be JAXB compatible.

CMethod parameters must be declared by using @WebParam.

DThe @WebMethod annotation must exist.

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Correct Answer: D

Question No. 3

Given the code fragment:

What output will be returned when this servlet is called a GET request?

AService() method called.

BService() method called.Get() method called.

CAn HTTP error

DGET() method called.

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Correct Answer: A

Question No. 4

Give the code fragment:

And the code fragment:

The sendConfirmation() and reserve() methods should be executed in the same transactional context.

Which transaction attributes do you ensure this?

AAdd annotations:@TransactionAttribute (TransactionAttributeType.REQUIRES_NEW) at line 2,@Transactional at line 9 and@TransactionAttribute ((TransactionAttributeType.MANDATORY) at line 12

BNo additional annotations are required.

CAdd annotations:@TransactionAttribute (TransactionAttributeType.REQUIRED) at line 2,@Transactional at line 9 and@TransactionAttribute ((TransactionAttributeType.REQUIRES_NEW) at line 12

DAdd annotations:@TransactionAttribute (TransactionAttributeType.MANDATORY) at line 2,@Transactional at line 9 and@TransactionAttribute ((TransactionAttributeType.REQUIRES_NEW) at line 12

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Correct Answer: D

Question No. 5

Given the JPQL code fragment:

Select pub.title, pub.author, pub.pages FROM Publisher pub

Which two clauses do you add to this JPQL query to retrieve only those books with between 500 and 750 total pages? (Choose two.)

AWHERE MIN(pages) >= 500 AND MAX(pages) <= 750

BWHERE pub.pages <= 500 OR pub.pages >= 750

CWHERE pub.pages BETWEEN 500 AND 750

DWHERE pub.pages <= 500 AND pub.pages >=750

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Correct Answer: A, B

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