JSTL c:if test string not null gotcha

March 14, 2012 14:23:14 Last update: March 14, 2012 14:23:14

If forgotPasswordForm.error is a String and not null, you cannot test the error condition with:

<!-- This does not work! -->
<c:if test="${forgotPasswordForm.error}">
    <p class="error">${forgotPasswordForm.error}</p>
</c:if>

You have to use "not empty":

<c:if test="${not empty forgotPasswordForm.error}">
    <p class="error">${forgotPasswordForm.error}</p>
</c:if>

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