Error compare data using jstl

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What steps will reproduce the problem?
1. import sql
2. open in netbean 7.3
3. add all required lib
4. running
5. throw exception at line 31: cannot compare data  <c:if 
test="${person.gender=='m'}">

The detail of error at bellow:

org.apache.jasper.JasperException: An exception occurred processing JSP page 
/WEB-INF/jsp/personEdit.jsp at line 31

28:                 </tr>
29:                 <tr>
30:                     <td valign="top">Gender</td>
31:                     <td><input type="radio" name="gender" value="m" <c:if 
test="${person.gender=='m'}">checked</c:if>/> Male
32:                         <input type="radio" name="gender" value="f" <c:if 
test="${person.gender=='f'}">checked</c:if>/> Female
33:                     </td>
34:                 </tr>


Stacktrace:
    org.apache.jasper.servlet.JspServletWrapper.handleJspException(JspServletWrapper.java:568)
    org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:470)
    org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:390)
    org.apache.jasper.servlet.JspServlet.service(JspServlet.java:334)
    javax.servlet.http.HttpServlet.service(HttpServlet.java:728)
    org.netbeans.modules.web.monitor.server.MonitorFilter.doFilter(MonitorFilter.java:393)
    org.springframework.web.servlet.view.InternalResourceView.renderMergedOutputModel(InternalResourceView.java:236)
    org.springframework.web.servlet.view.AbstractView.render(AbstractView.java:257)
    org.springframework.web.servlet.DispatcherServlet.render(DispatcherServlet.java:1183)
    org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:902)
    org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:807)
    org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:571)
    org.springframework.web.servlet.FrameworkServlet.doGet(FrameworkServlet.java:501)
    javax.servlet.http.HttpServlet.service(HttpServlet.java:621)
    javax.servlet.http.HttpServlet.service(HttpServlet.java:728)
    org.netbeans.modules.web.monitor.server.MonitorFilter.doFilter(MonitorFilter.java:393)
root cause

Original issue reported on code.google.com by anhtuank...@gmail.com on 21 Jun 2013 at 4:58