JSP - MCQ Quiz (Question Bank)

• Identify, describe, or write JSP code for: (a) template text, (b) scripting elements (comments, directives, declarations, scriptlets, expressions), (c) standard and custom actions, (d) expression language elements.
• Write JSP code using the directives: (a) page (with attributes import, session, contentType, isELIgnored), (b) include, (c) taglib.
• Write a JSP Document (XML-based) with correct syntax.
• Describe the JSP page lifecycle: translation, compilation, class loading, instantiation, jspInit(), _jspService(), jspDestroy().
• Write JSP code using implicit objects: request, response, out, session, config, application, page, pageContext, exception.
• Configure the deployment descriptor to declare tag libraries, deactivate EL, and deactivate scripting.
• Write JSP code using the most appropriate inclusion mechanism (include directive vs jsp:include).
• Create code using standard actions: jsp:useBean, jsp:getProperty, jsp:setProperty, jsp:attribute, jsp:include, jsp:forward, jsp:param.
• Write EL code accessing implicit variables: pageScope, requestScope, sessionScope, applicationScope, param, paramValues, header, headerValues, cookie, initParam, pageContext.
• Write EL code using operators: property access (.), collection access ([]).
• Create custom tag libraries and tag files. Describe Classic and Simple tag event models.

Q: Place the JSP lifecycle events in order:

1. JSP page is translated
2. JSP page is compiled
3. JSP page implementation class is loaded
4. jspInit is called
5. _jspService is called
6. jspDestroy is called

Q: Place the code to import static content at translation-time:

<%@ include file='foo.jsp' %>

Q: Place the code to access a servlet context attribute as a bean:

<jsp:useBean id='catalog' type='java.util.List' scope='application' />

Q: Place the code to include dynamic content at request-time:

<jsp:include page='foo.jsp' />

Key standard actions covered in this unit:

Key rules:

• jsp:useBean with class creates a new bean; with type only, it must already exist
• jsp:setProperty with property="*" sets all matching request parameters
• jsp:include uses page attribute (not file); jsp:insert does not exist
• jsp:param must be nested inside jsp:include, jsp:forward, or jsp:plugin

EL implicit objects: pageScope, requestScope, sessionScope, applicationScope, param, paramValues, header, headerValues, cookie, initParam, pageContext.

EL operators: property access (.), collection access ([]), arithmetic (+, -, *, /, %), relational (==, !=, <, >, eq, ne, lt, gt), logical (&&, ||, !, and, or, not), empty.

EL functions: declared in TLD, method must be public static, invoked as ${prefix:functionName(args)}.

JSTL Core: c:out, c:set, c:remove, c:catch, c:if, c:choose/when/otherwise, c:forEach, c:forTokens, c:import, c:redirect, c:url, c:param.

Classic Tags: Tag, IterationTag, BodyTag interfaces; TagSupport, BodyTagSupport classes. Key methods: doStartTag(), doAfterBody(), doEndTag().

Simple Tags: SimpleTag interface; SimpleTagSupport class. Single doTag() method. Objects never reused.

Tag Files: .tag extension in /WEB-INF/tags. No TLD needed. Internally converted to Simple Tag Handlers.