SUN 310-083 : Sun Certified Web Component Developer for J2EE 5

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SUN Sun Certified Web Component Developer for J2EE 5 Sample Questions:

1. You web application uses a lot of Java enumerated types in the domain model of the application. Built into each enum type is a method, getDisplay(), which returns a localized, user-oriented string. There are many uses for presenting enums within the web application, so your manager has asked you to create a custom tag that iterates over the set of enum values and processes the body of the tag once for each value; setting the value into a page-scoped attribute called, enumValue. Here is an example of how this tag is used:
1 0. <select name='season'>
1 1. <t:everyEnum type='com.example.Season'>
1 2. <option value='${enumValue}'>${enumValue.display}</option>
1 3. </t:everyEnum>
1 4. </select>
You have decided to use the Simple tag model to create this tag handler.
Which tag handler method will accomplish this goal?

A) public void doTag() throw JspException {
try {
for ( Enum value : getEnumValues() ) {
pageContext.setAttribute("enumValue", value);
getJspBody().invoke(getOut());
}
} (Exception e) { throw new JspException(e); }
}
B) public void doTag() throw JspException {
try {
for ( Enum value : getEnumValues() ) {
getJspContext().setAttribute("enumValue", value);
getJspBody().invoke(null);
}
} (Exception e) { throw new JspException(e); }
}
C) public void doTag() throw JspException {
try {
for ( Enum value : getEnumValues() ) {
pageContext.setAttribute("enumValue", value);
getJspBody().invoke(getJspContext().getWriter());
}
} (Exception e) { throw new JspException(e); }
}
D) public void doTag() throw JspException {
try {
for ( Enum value : getEnumValues() ) {
getJspContext().setAttribute("enumValue", value);
getJspBody().invoke(getJspContext().getWriter());
}
} (Exception e) { throw new JspException(e); }
}

2. Given:
1 . package com.example;
2 .
3 . public abstract class AbstractItem {
4 . private String name;
...
13. }
Assume a concrete class com.example.ConcreteItem extends com.example.AbstractItem.
A servlet sets a session-scoped attribute called "item" that is an instance of com.example.ConcreteItem and then forwards to a JSP page.
Which two are valid standard action invocations that expose a scripting variable to the JSP page? (Choose two.)

A) <jsp:useBean id="item" type="com.example.ConcreteItem"
class="com.example.AbstractItem"
scope="session" />
B) <jsp:useBean id="com.example.ConcreteItem"
scope="session" />
C) <jsp:useBean id="item" type="com.example.ConcreteItem"
scope="session" />
D) <jsp:useBean id="item" class="com.example.ConcreteItem"
scope="session" />

3. A custom JSP tag must be able to support an arbitrary number of attributes whose names are unknown when the tag class is designed. Which two are true? (Choose two.)

A) The <body-content> element in the echo tag TLD must have the value JSP.
B) The class implementing the echo tag handler must implement the
javax.servlet.jsp.tagext.IterationTag interface.
C) The class implementing the echo tag handler must implement the
javax.servlet.jsp.tagext.DynamicAttributes interface.
D) The echo tag handler must define the setAttribute(String key, String value) method.
E) The <dynamic-attributes>true</dynamic-attributes> element must appear in the echo tag TLD.

4. What is the purpose of session management?

A) To tell the web container to keep the HTTP connection alive so it can make subsequent requests without the delay of making the TCP connection.
B) To manage the user's login and logout activities.
C) To store information on the server-side between HTTP requests.
D) To store information on the client-side between HTTP requests.

5. After a merger with another small business, your company has inherited a legacy WAR file but the original source files were lost. After reading the documentation of that web application, you discover that the WAR file contains a useful tag library that you want to reuse in your own webapp packaged as a WAR file.
What do you need to do to reuse this tag library?

A) Unpack the legacy WAR file, move the TLD file to the META-INF directory, move the class files to the top-level directory, repackage the WAR, and place that WAR file in your webapp's WEB-INF directory.
B) Unpack the legacy WAR file, move the TLD file to the META-INF directory, repackage the whole thing as a JAR file, and place that JAR file in your webapp's library directory.
C) Unpack the legacy WAR file, move the TLD file to the META-INF directory, move the class files to the top-level directory, repackage the whole thing as a JAR file, and place that
JAR file in your webapp's library directory.
D) Simply rename the legacy WAR file as a JAR file and place it in your webapp's library directory.

Solutions: