Struts property tag question

[Joe San]

I would like to access the value using a property tag. This value comes from a Map < String, Long >. I have the String for which I would need the Long. The catch here is, I do not have an iterator running ahead of it.

I have the following check but this would throw me an exception:

	<s:iterator value="#session.examObject.allQuestionIdMap">
		<s:if test="%{session.examObject.allQuestionIdMap == session.examObject.currentQuestion.questionId}">
			<s:property value="#session.examObject.allQuestionIdMap"/>	
		</s:if>
        </s:iterator>

What is wrong with the above code? In my if I have to check for the String questionId and if they are equal, print the long value in s:property.

[Joe San]

Got one step closer to the issue:

		<s:if test='<s:property value="key"/> == #session.examObject.currentQuestion.questionId'>
			<s:property value="value"/>
		</s:if>

Why would the above sample code not get into the if and print the value?

[Mohana Rao Sv]

         <s:if test=%{'<s:property value="key"/> == #session.examObject.currentQuestion.questionId'>}  
            <s:property value="value"/>  
        </s:if>

To test your code :

<s:property value=%{'<s:property value="key"/> == #session.examObject.currentQuestion.questionId'>}/>

It evaluates the expression and prints the true or false.

[Joe San]

It gave me the following error. Do I have to escape the quotes?

30122262 WARN  Include  - Exception thrown during include of nextExamQuestion.jsp
org.apache.jasper.JasperException: /WEB-INF/pages/content/nextExamQuestion.jsp (line: 11, column: 21) quote symbol expected
	at org.apache.jasper.compiler.DefaultErrorHandler.jspError(DefaultErrorHandler.java:42)
	at org.apache.jasper.compiler.ErrorDispatcher.dispatch(ErrorDispatcher.java:408)
	at org.apache.jasper.compiler.ErrorDispatcher.jspError(ErrorDispatcher.java:89)
	at org.apache.jasper.compiler.Parser.parseAttribute(Parser.java:222)
	at org.apache.jasper.compiler.Parser.parseAttributes(Parser.java:162)
	at org.apache.jasper.compiler.Parser.parseAttributes(Parser.java:153)
	at org.apache.jasper.compiler.Parser.parseCustomTag(Parser.java:1236)
	at org.apache.jasper.compiler.Parser.parseElements(Parser.java:1452)
	at org.apache.jasper.compiler.Parser.parseBody(Parser.java:1664)
	at org.apache.jasper.compiler.Parser.parseOptionalBody(Parser.java:1002)
	at org.apache.jasper.compiler.Parser.parseCustomTag(Parser.java:1274)
	at org.apache.jasper.compiler.Parser.parseElements(Parser.java:1452)
	at org.apache.jasper.compiler.Parser.parse(Parser.java:138)
	at org.apache.jasper.compiler.ParserController.doParse(ParserController.java:242)
	at org.apache.jasper.compiler.ParserController.parse(ParserController.java:102)
	at org.apache.jasper.compiler.Compiler.generateJava(Compiler.java:198)
	at org.apache.jasper.compiler.Compiler.compile(Compiler.java:373)
	at org.apache.jasper.compiler.Compiler.compile(Compiler.java:353)
	at org.apache.jasper.compiler.Compiler.compile(Compiler.java:340)
	at org.apache.jasper.JspCompilationContext.compile(JspCompilationContext.java:646)
	at org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:357)
	at org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:390)
	at org.apache.jasper.servlet.JspServlet.service(JspServlet.java:334)
	at javax.servlet.http.HttpServlet.service(HttpServlet.java:722)
	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:305)
	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:210)
	at org.apache.catalina.core.ApplicationDispatcher.invoke(ApplicationDispatcher.java:690)
	at org.apache.catalina.core.ApplicationDispatcher.doInclude(ApplicationDispatcher.java:599)
	at org.apache.catalina.core.ApplicationDispatcher.include(ApplicationDispatcher.java:536)
	at org.apach
        ...........
        ...........
        ............

[Joe San]

This version seems to work without errors, but still the s:if is not getting inside to print the property value

         <s:if test='%{<s:property value="key"/> == #session.examObject.currentQuestion.questionId>}'>    
            <s:property value="value"/>    
        </s:if>

[Mohana Rao Sv]

<s:property value=%{<s:property value="key"/> == #session.examObject.currentQuestion.questionId>}/>

And you can apply string functions on ognl expressions.

<s:set var='name' value="hello"/>

<s:set var='otherName' value="hello"/>

<s:property value=%{#name.equals(otherName)}/>

I haven't tested it. I hope this help you. I will update my answer once i tested it with proper quotes.

[Joe San]

	<s:property value='%{#ques1.equals(ques2)}' />

The above tag evaluates to false and I'm confused as to how this could happen.

The following is what I get printed for ques1 and ques2:

ques2=5027ef048710ec01559ce540 ques1=5027ef048710ec01559ce540 false // How come this prints false?
ques2=5027ef048710ec01559ce540 ques1=5027ef118710ec01559ce541 false 
ques2=5027ef048710ec01559ce540 ques1=5027ef228710ec01559ce542 false 
ques2=5027ef048710ec01559ce540 ques1=5027ef2f8710ec01559ce543  false

[Joe San]

In fact even <s:property value='%{#ques1.equals(ques1)}' /> would print false which is unbelievable.

[Mohana Rao Sv]

	                <s:set var="ques1" value="%{'Hello'}"/>
			        <s:set var="ques2" value="%{'Hello'}"/>
			              
			T/F --	<s:property value="%{#ques1.equals(#ques2)}"/>
			T/F --	<s:property value="%{#ques1.equals(#ques1)}"/>
        Size --      <s:property value="%{#ques1.length()}"/>

I was updated my answer with proper quotes. I had used set for demonstration purpose don't use it. Evaluate the expression directly don't set it SET and compare.