<c:catch> does not work with <fmt:parseNumber> JSTL 1.2 - parsing

Question

I'm implementing a simple JSP page using JSTL 1.2 (Apache Taglibs). The page does the following:
<c:catch var="error">
<fmt:parseNumber var="parsedNum" value="${param.num}" />
</c:catch>
The HTML input element looks like this:
<input type="text" name="num" size="3"/>
I'm aware that the input "12a" is permitted due to the way the parsing mechanism works. Nevertheless, I would like to catch completely wrong input, e.g., "aaa". Unfortunately, the thrown exception is not managed by <c:catch>, resulting in Tomcat 7 showing the whole stack trace.
Any advice? Thanks.

Answer 1

Please post a testable page for us. For example, the following page works fine for me.
<%#taglib uri="http://java.sun.com/jsp/jstl/core" prefix="c"%>
<%# taglib prefix="fmt" uri="http://java.sun.com/jsp/jstl/fmt" %>
<c:catch var="error">
<fmt:parseNumber var="parsedNum" value="aaa" />
</c:catch>
${parsedNum}
${error}