[2021] Valid 1Z0-900 test answers & Oracle 1Z0-900 exam pdf [Q39-Q55]

[2021] Valid 1Z0-900 test answers & Oracle 1Z0-900 exam pdf

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Oracle 1Z0-900 Exam Syllabus Topics:

Topic	Details
Topic 1	Create WebSocket Server and Client Endpoint Handlers using JSR 356 API and JavaScript Demonstrate understanding of Enterprise JavaBeans and CDI beans
Topic 2	Use Entity Manager to perform database operations, transactions and locking with JPA entities Create and execute JPQL statements
Topic 3	Handle errors using Servlets and Java Server Pages Describe JSP syntax, use tag libraries and Expression Language (EL)
Topic 4	Define Java to XML Schema mappings to marshall and unmarshall Java Objects by using JAXB API Create, package and deploy Java EE application
Topic 5	Create sessionEJB components containing synchronous and asynchronous business methods Demonstrate understanding of the relationship between bean components
Topic 6	Manage servlet life cycle with container callback methods and WebFilters Create SOAP Web Services and Clients using JAX-WS API
Topic 7	Create JPA Entity and Relationship Object-Relational Mappings (ORM) Produce and consume, encode and decode WebSocket messages
Topic 8	Create REST Services and clients using JAX-RS API Create REST Services and clients using JAX-RS API
Topic 9	Handle entity data with conversions, validations, and key generation Describe Java EE 7 standards, containers, APIs, and services

NEW QUESTION 39
Given the code fragment:

Which method should be used on line 3to enable default validation mechanism?

A. u.setProperty(Schema)
B. u.setEventHandler(ValidationEventHandler)
C. u.setProperty(String, Object)
D. u.setAdapter(XmlAdapter)

Answer: D

Explanation:
Explanation/Reference:
Reference: https://docs.oracle.com/javaee/6/api/javax/xml/bind/Unmarshaller.html

NEW QUESTION 40
You need to exchange large binary messages using chunks in a WebSocket application. Identify two ways in which you can receive partial messages. (Choose two.)

A. Define an @OnMessagemethod with byte [] as the first parameter and a booleanas the second parameter.
B. Use a MessageHandler.Partial<ByteBuffer>interface implementation.
C. Define an @OnMessagemethod with a single MimePart parameter.
D. Use a ChunkListenerinterface implementation.

Answer: A,B

Explanation:
Explanation/Reference:
Reference: https://abhirockzz.gitbooks.io/java-websocket-api-handbook/content/Receiving%
20Messages.html

NEW QUESTION 41
Given the code fragment:

How long does this cookie persist?

A. this request
B. until server shutdown
C. until browser shutdown
D. until garbage collection in the servlet instance

Answer: C

Explanation:
Explanation/Reference:
Reference: https://docs.oracle.com/javaee/6/api/javax/servlet/http/Cookie.html

NEW QUESTION 42
Given the code fragment:

How can you apply DateConverterto the birthdayfield?

A. by adding @Converter(autoApply=true)at line 1
B. by adding @Convert(to=Date.class)at line 3
C. by adding @Convert((DateConverter.class))at line 2
D. by invoking the setConverter(DateConverter.class)method on the EntityManagerobject

Answer: B

NEW QUESTION 43
When should a JPA entity implement the Serializable interface?

A. when JPA entities are used as parameters or return values by the remote EJB operations
B. when JPA entities are used in the EJB Full container
C. always, because JPA entities are required to implement the Serializable interface
D. when JPA entities are used outside of the EJB Lite container

Answer: A

Explanation:
Explanation
Reference
https://stackoverflow.com/questions/2020904/when-and-why-jpa-entities-should-implement-serializable-interfac

NEW QUESTION 44
Which two elements CANNOT be injected by using an @Inject annotation? (Choose two.)

A. abstract methods
B. instance fields declared final
C. static fields
D. concrete methods

Answer: A,B

Explanation:
Explanation
Reference https://docs.oracle.com/javaee/6/api/javax/inject/Inject.html

NEW QUESTION 45
Which three statements are true for an expense destination transfers that does NOT require a receipt at destination inventory organization?

A. There is no put away transaction in Inventory since the item is expensed.
B. A receipt is required on interorganization expense destination transfer orders between the from and to organizations.
C. The transfer order is considered received and delivered at the time of shipment.
D. There is no cost associated to the transaction.
E. The destination inventory is not incremented.

Answer: A,D,E

NEW QUESTION 46
Given the following code:

What should you do at line 1to enable this servlet receive request data without blocking?

A. Define an AsyncListenerand assign it to the AsyncContext object.
B. Create a Callable class and delegate this operation to a ManagedExecutorServiceby using the dispatch method of AsyncContext.
C. Define a ReadListener and assign it to the request input stream.
D. Use a Runnableinstance with the start ()method of AsyncContext.

Answer: A

Explanation:
Explanation

NEW QUESTION 47
Your organization is planning for a periodic counting of individual items automatically throughout the course of the year. As part of this activity, the user has loaded items to the cycle count but some of the items are not being considered when count schedules and count sequences are not generated.
Identify two reasons that explain why the items are not being considered.

A. The approval controls are not set up.
B. The ABC assignment group is not defined.
C. The Include in Schedule option is not selected to include the item for auto-scheduling.
D. The Cycle Count Enabled flag is not selected for the inventory organization.
E. The Cycle Count Enabled flag is not selected for the item.

Answer: A,E

NEW QUESTION 48
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?

A. Add annotations:@TransactionAttribute (TransactionAttributeType.REQUIRED) at line
2,@Transactional at line 9 and@TransactionAttribute ((TransactionAttributeType.REQUIRES_NEW) at line 12
B. Add annotations:@TransactionAttribute (TransactionAttributeType.REQUIRES_NEW) at line
2,@Transactional at line 9 and@TransactionAttribute ((TransactionAttributeType.MANDATORY) at line 12
C. Add annotations:@TransactionAttribute (TransactionAttributeType.MANDATORY) at line
2,@Transactional at line 9 and@TransactionAttribute ((TransactionAttributeType.REQUIRES_NEW) at line 12
D. No additional annotations are required.

Answer: C

NEW QUESTION 49
Given the following class definition with numbered lines:

How do you specify to use this mock CDI bean implementation instead of the regular implementation class?

A. Reorder the implementation names in the beans.xmlfile such that the desired alternative is listed earlier.
B. Delete the regular implementation class from the WAR.
C. Use the alternativeselement in the beans.xmlfile and specify the class name in the class element within it.
D. Start up the server with the optional -alternativecommand-line option, specifying any alternative class names in a comma-separated list.

Answer: D

Explanation:
Explanation/Reference:

NEW QUESTION 50
Which statement is true about JAX-RS resource implementation?

A. The REST resource class can be implemented as a stateful Enterprise JavaBean (EJB).
B. The REST resource implementation class must extend the javax.ws.rs.core.Applicationclass
C. The REST resource class can be implemented as a Plain Old Java Object (POJO).
D. The REST resource implementation class must not be final.

Answer: B

Explanation:
Explanation/Reference:
Reference: https://docs.oracle.com/javaee/7/tutorial/jaxrs002.htm

NEW QUESTION 51
You need to develop a chat application, which allows the display of emoticons and images together with text messages.
How should you configure a WebSocket endpoints to receive both text and binary messages?

A. You can achieve this only by creating separate WebSocket endpoints for each message type.
B. Create two @onMessage methods in the same endpoint with appropriate parameter types.
C. Create two @onMessage methods, each with appropriate decoder attribute in the same endpoint.
D. Define the @onMessage methods in your endpoint with Object as parameter and check the actual type in your code.

Answer: C

NEW QUESTION 52
Given the code fragment:

Assuming this bean is used only in the code fragment above, how long will the injected Beaninstance be available?

A. for the lifetime of the Serviceobject
B. for the lifetime of the request
C. for the lifetime of the session
D. for the lifetime of the enterprise application

Answer: A

NEW QUESTION 53
Given the code fragments:

What code should you add to the body of the updateEmployeemethod in order to save pending changes to the database?

A. entityManager.lock(emp);
EntityManager.merge(emp);
B. entityManager.merge(emp);
C. Context. Ctx = new InitialContext();
UserTransaction utx = (UserTransaction)ctx.lookup("java:comp/
UserTransaction");
utx.begin();
entityManager.merge(emp);
utx.commit();
D. entityManager.getTransaction().begin();
entityManager.merge(emp);
entityManager.getTransaction().commit();

Answer: C

NEW QUESTION 54
Given the code sample:

And:

And:

And the next fragment from beans.xml:

And this injection point:
@Inject GenericMessenger messageHandler;
Which type would be injected at run time and referenced by the messageHandlervariable?
SmsHandler