how to compare null in jstl with variable?

Question

The value of y is null, but it always execute otherwise part. part. null is considered as not empty.

<c:choose>
  <c:when test="${empty y}">
   value=""
  </c:when>
<c:otherwise>
 value="${y}"
</c:otherwise>

It's not null. My guess is that it is equal to the String "null". — JB Nizet, Dec 04 '18 at 11:17
try `logic:equal` and give value as `null`, if executed then what @JB Nizet said is right. Reference https://stackoverflow.com/questions/19979470/struts-logic-tag-equals-not-working — Arun Sudhakaran, Dec 04 '18 at 11:38

Avijit Barua · Accepted Answer · 2018-12-06T16:09:19.657

0

If y is string write your code like this

    <c:choose>
        <c:when test="${y==null || y==''}">
          value=""
        </c:when>
        <c:otherwise>
         value="${y}"
        </c:otherwise> 
    </c:choose>

edited Dec 06 '18 at 16:09

answered Dec 05 '18 at 13:10

Avijit Barua

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That's exactly the same as `empty` will be doing for you. See https://stackoverflow.com/questions/14185031/how-does-el-empty-operator-work-in-jsf – Jasper de Vries Dec 06 '18 at 14:39

how to compare null in jstl with variable?

1 Answers1