the equivalent code is
<c:choose>
<c:when test="${validated != 'Y' }">
<form:form id="newJob" method="post" action="updateValidated"
commandName="jobModel">
<form:input path="regattaId" type="hidden" />
<form:input path="job_id" type="hidden" />
<table>
<tr>
<td><spring:message code="label.validated" />
<td><form:radiobutton path="validated" value="Y" />Yes<form:radiobutton
path="validated" value="N" />No</td>
</tr>
</table>
<input type="submit" class="button"
value='<spring:message code="label.validateJob"/>' hidden="true" />
</form:form>
</c:when>
<c:otherwise>
This job is validated
</c:otherwise>
</c:choose>
Jstl's c:if tag doesn't have a companion c:else tag. Try c:choose!