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Oracle 1Z0-858 Exam Syllabus Topics:

Oracle Java Enterprise Edition 5 Web Component Developer Certified Professional Sample Questions:

1. Which JSTL code snippet produces the output "big number" when X is greater than 42, but outputs "small number" in all other cases?

A) <c:if test='<%= (X > 42) %>'>
<c:then>big number</c:then>
<c:else>small number</c:else>
</c:if>
B) <c:choose test='<%= (X > 42) %>'>
<c:then>big number</c:when>
<c:else>small number</c:otherwise>
</c:choose>
C) <c:choose>
<c:when test='<%= (X > 42) %>'>big number</c:when>
<c:otherwise>small number</c:otherwise>
</c:choose>
D) <c:if>
<c:then test='<%= (X > 42) %>'>big number</c:then>
<c:else>small number</c:else> </c:if>
E) <c:choose test='<%= (X > 42) %>'>
<c:when>big number</c:when>
<c:otherwise>small number</c:otherwise>
</c:choose>

2. 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.HttpSessionListener
D) javax.servlet.http.HttpSessionValueListener

3. You are building a web application that will be used throughout the European Union; therefore, it has significant internationalization requirements. You have been tasked to create a custom tag that generates a message using the java.text.MessageFormat class. The tag will take the resourceKey attribute and a variable number of argument attributes with the format, arg<N>. Here is an example use of this tag and its output:
<t:message resourceKey='diskFileMsg' arg0='MyDisk' arg1='1247' />
generates:
The disk "MyDisk" contains 1247 file(s).
Which Simple tag class definition accomplishes this goal of handling a variable number of tag attributes?

A) The Simple tag model does NOT support a variable number of attributes.
B) public class MessageTag extends SimpleTagSupport
implements VariableAttributes {
private Map attributes = new HashMap();
public void putAttribute(String name, Object value) {
this.attributes.put(name, value);
}
// more tag handler methods
}
C) public class MessageTag extends SimpleTagSupport
implements DynamicAttributes {
private Map attributes = new HashMap();
public void putAttribute(String name, Object value) {
this.attributes.put(name, value);
}
// more tag handler methods
}
D) public class MessageTag extends SimpleTagSupport
implements DynamicAttributes {
private Map attributes = new HashMap();
public void setDynamicAttribute(String uri, String name,
Object value) {
this.attributes.put(name, value);
}
// more tag handler methods
}
E) public class MessageTag extends SimpleTagSupport
implements VariableAttributes {
private Map attributes = new HashMap();
public void setVariableAttribute(String uri,
String name, Object value) {
this.attributes.put(name, value);
}
// more tag handler methods
}

4. You are creating an error page that provides a user-friendly screen whenever a server exception occurs. You want to hide the stack trace, but you do want to provide the
exception's error message to the user so the user can provide it to the customer service agent at your company. Which EL code snippet inserts this error message into the error page?

A) Message: <b>${exception.message}</b>
B) Message: <b>${pageContext.exception.message}</b>
C) Message: <b>${request.exception.errorMessage}</b>
D) Message: <b>${exception.errorMessage}</b>
E) Message: <b>${pageContext.exception.errorMessage}</b>
F) Message: <b>${request.exception.message}</b>

5. Given that a web application consists of two HttpServlet classes, ServletA and ServletB, and the ServletA.service method:
20.
String key = "com.example.data";
21.
session.setAttribute(key, "Hello");
22.
Object value = session.getAttribute(key);
23.
Assume session is an HttpSession, and is not referenced anywhere else in ServletA.
Which two changes, taken together, ensure that value is equal to "Hello" on line 23? (Choose two.)

A) ensure that the ServletB.service method is synchronized
B) enclose lines 21-22 in a synchronized block:
synchronized(session) {
session.setAttribute(key, "Hello");
value = session.getAttribute(key);
}
C) enclose lines 21-22 in a synchronized block:
synchronized(this) {
session.setAttribute(key, "Hello");
value = session.getAttribute(key);
}
D) ensure that ServletB synchronizes on the session object when setting session attributes
E) ensure that the ServletA.service method is synchronized

Solutions: