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Oracle 1Z0-858 Exam Syllabus Topics:
| Section | Objectives |
|---|---|
| Servlet Technology | - Servlet fundamentals
|
| Web Application Architecture | - Java EE Web tier overview
|
| JavaServer Pages (JSP) | - JSP tag libraries
|
| Deployment and Configuration | - Web application packaging
|
| Expression Language (EL) | - EL syntax and usage
|
| Web Application Security | - Secure communication
|
Oracle Java Enterprise Edition 5 Web Component Developer Certified Professional Sample Questions:
The Squeaky Beans Inc. shopping application was initially developed for a non-distributed environment. The company recently purchased the Acme Application Server, which supports distributed HttpSession objects. When deploying the application to the server, the deployer marks it as distributable in the web application deployment descriptor to take advantage of this feature.
Given this scenario, which two must be true? (Choose two.)
- A. As per the specification, the J2EE web container ensures that distributed HttpSession objects will be stored in a database.
- B. The J2EE web container must support migration of objects that implement Serializable.
- C. The J2EE web container must use the native JVM Serialization mechanism for distributing HttpSession objects.
- D. Storing references to Enterprise JavaBeans components in the HttpSession object might NOT be supported by J2EE web containers.
Correct Answer: B,D 🗳️
Which interface must a class implement so that instances of the class are notified after any object is added to a session?
- A. javax.servlet.http.HttpSessionBindingListener
- B. javax.servlet.http.HttpSessionAttributeListener
- C. javax.servlet.http.HttpSessionValueListener
- D. javax.servlet.http.HttpSessionListener
Correct Answer: B 🗳️
Given that www.example.com/SCWCDtestApp is a validly deployed Java EE web application and that all of the JSP files specified in the requests below exist in the locations specified. Which two requests, issued from a browser, will return an HTTP 404 error? (Choose two.)
- A. http://www.example.com/SCWCDtestApp/Customer/Update/test.jsp
- B. http://www.example.com/SCWCDtestApp/Customer/test.jsp
- C. http://www.example.com/SCWCDtestApp/test.jsp
- D. http://www.example.com/SCWCDtestApp/WEB-INF/test.jsp
- E. http://www.example.com/SCWCDtestApp/META-INF/test.jsp
- F. http://www.example.com/SCWCDtestApp/WEB-WAR/test.jsp
Correct Answer: D,E 🗳️
Your web application requires the adding and deleting of many session attributes during a complex use case. A bug report has come in that indicates that an important session attribute is being deleted too soon and a NullPointerException is being thrown several interactions after the fact. You have decided to create a session event listener that will log when attributes are being deleted so you can track down when the attribute is erroneously being deleted.
Which listener class will accomplish this debugging goal?
- A. Create an SessionAttributeListener class and implement the attributeRemoved method and log the attribute name using the getAttributeName method on the event object.
- B. Create an SessionAttributeListener class and implement the attributeDeleted method and log the attribute name using the getAttributeName method on the event object.
- C. Create an HttpSessionAttributeListener class and implement the attributeDeleted method and log the attribute name using the getName method on the event object.
- D. Create an HttpSessionAttributeListener class and implement the attributeRemoved method and log the attribute name using the getName method on the event object.
Correct Answer: D 🗳️
One of the use cases in your web application uses many session-scoped attributes. At the end of the use case, you want to clear out this set of attributes from the session object. Assume that this static variable holds this set of attribute names:
201.
private static final Set<String> USE_CASE_ATTRS;
202.
static {
203.
USE_CASE_ATTRS.add("customerOID");
204.
USE_CASE_ATTRS.add("custMgrBean");
205.
USE_CASE_ATTRS.add("orderOID");
206.
USE_CASE_ATTRS.add("orderMgrBean");
207.
}
Which code snippet deletes these attributes from the session object?
- A. session.deleteAllAttributes(USE_CASE_ATTRS);
- B. for ( String attr : USE_CASE_ATTRS ) {
session.remove(attr);
} - C. for ( String attr : USE_CASE_ATTRS ) {
session.removeAttribute(attr);
} - D. session.removeAll(USE_CASE_ATTRS);
- E. for ( String attr : USE_CASE_ATTRS ) {
session.deleteAttribute(attr);
}
Correct Answer: C 🗳️
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