JSTL if tag always execute as true

Question

I am working with a JSTL and trying to implement a if tag

below is my code for file login.tag

<c:if test="${not empty param.error}">
        //do something
</c:if>

My understanding is when I access this page

with path/index.jsp   //the if tag is not executed 
with path/index.jsp?error=wrongpassword   //the if tag is executed

But what I am getting now is the if tag is always execute true, Please advice

Check the generated HTML code. My guess is that it contains , which means that the if tag is not interpreted, probably because you didn't declare the code library at the top of the JSP. — JB Nizet, Dec 25 '14 at 13:12
I have checked the html , the c:if is printed in html , what does that mean? — Leon Armstrong, Dec 25 '14 at 13:14
It means that the if tag is not interpreted, probably because you didn't declare the code library at the top of the JSP. — JB Nizet, Dec 25 '14 at 13:15

score 2 · Accepted Answer · edited May 23 '17 at 12:31

2

If you want to use c:if tag you should use JSP taglib directive for JSTL core tag library. Use below code at the top of the JSP

<%@ taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core" %>

You also need libraries for JSTL as dependencies to your project. See this answer to find maven dependencies.

edited May 23 '17 at 12:31

Community

answered Dec 25 '14 at 16:03

Roman C

Thanks for mentioning adding dependencies , Finally get it to work as expected! – Leon Armstrong Dec 26 '14 at 05:26

1 Answers1