1z0-900 — Free Practice Questions
10 free sample questions from a bank of 63, with the correct answers and explanations. No signup required — start practising right now.
1You 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?
- Create two @onMessage methods in the same endpoint with appropriate parameter types.
- Define the @onMessage methods in your endpoint with Object as parameter and check the actual type in your code.
- You can achieve this only by creating separate WebSocket endpoints for each message type.
- Create two @onMessage methods, each with appropriate decoder attribute in the same endpoint.
Answer: A
2Given the code fragment from a Facelet page: On Line 1, you ae asked to insert a search box that displays the text "Search Here" via a placeholder.
Assume searchMB is a valid Managed Bean.
Which two options enable you to create a search box with a placeholder attribute on Line 1? (Choose two.)
Answer:
3Given the code fragment: Which method should be used on line 3 to enable default validation mechanism?
- u.setProperty(String, Object)
- u.setProperty(Schema)
- u.setEventHandler(ValidationEventHandler)
- u.setAdapter(XmlAdapter)
Answer: D
4How do you specify a default error page in your web.xml file?
- /general-error.html
- * /general-error.html
- * /general-error.html
- /general-error.html
Answer: B
5Given the code fragment: And - Which two steps, when performed independently, enable the index.xhtml page to print the following text: The Id is 12345? (Choose two.)
- Replace line 2 with: @Inject public void setAcc(Account acc)
- Replace line 3 with: @Inject public Account getAcc()
- Replace line 1 with: @Inject private Account acc;
- Replace line 3 with: public @Inject Account getAcc()
- Replace line 1 with: private @Inject Account acc;
- Replace line 2 with: public void setAcc(@Inject Account acc)
Answer: D, F
6Given: How often does the submitted task run?
- need more details to determine
- once
- as many times as you like
- based on a schedule
Answer: A
7Given: What code needs to be added to line 1 for MyMapper bean instances to be correctly passivated?
- @Stateless @PassivationCapable
- @Stateless
- @Stateful @PassivationCapable
- @Stateful
Answer: D
8Which URL represents an invalid approach to pass a parameter to a REST resource?
- /Employees?value=1
- /Employees&value=1
- /Employees/1
- /Employees;value=1
Answer: D
9Given: If an exception is thrown inside the if block, what effect will it have on the transaction?
- The transaction will be committed.
- The transaction will be suspended.
- The transaction will be rolled back.
Answer: C
10Given the code fragments: What code should you add to the body of the updateEmployee method in order to save pending changes to the database?
- entityManager.merge(emp);
- Context. Ctx = new InitialContext(); UserTransaction utx = (UserTransaction)ctx.lookup("java:comp/UserTransaction"); utx.begin(); entityManager.merge(emp); utx.commit();
- entityManager.lock(emp); EntityManager.merge(emp);
- entityManager.getTransaction().begin(); entityManager.merge(emp); entityManager.getTransaction().commit();
Answer: B
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