When web server is resin, it's ok. And these days I deploy the web app to jboss-4.2.1.GA. When i use jstl(1.1) like this: <fmt:formatDate value="10/25/2007 " type="both"/> report follow error. How to resolve this problem? thank you! anonymous wrote : org.apache.jasper.JasperException: org.jboss.util.NestedRuntimeException: Unparseable date: "Thu Oct 25 14:00:00 CST 2007"; - nested throwable: (java.text.ParseException: Unparseable date: "Thu Oct 25 14:00:00 CST 2007") | org.apache.jasper.servlet.JspServletWrapper.handleJspException(JspServletWrapper.java:535) | org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:429) | org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:320) | org.apache.jasper.servlet.JspServlet.service(JspServlet.java:266) | javax.servlet.http.HttpServlet.service(HttpServlet.java:803) | org.apache.struts.action.RequestProcessor.doForward(RequestProcessor.java:1063) | org.apache.struts.action.RequestProcessor.processForwardConfig(RequestProcessor.java:386) | org.apache.struts.action.RequestProcessor.process(RequestProcessor.java:229) | org.apache.struts.action.ActionServlet.process(ActionServlet.java:1194) | org.apache.struts.action.ActionServlet.doGet(ActionServlet.java:414) | javax.servlet.http.HttpServlet.service(HttpServlet.java:690) | javax.servlet.http.HttpServlet.service(HttpServlet.java:803) | org.jboss.web.tomcat.filters.ReplyHeaderFilter.doFilter(ReplyHeaderFilter.java:96) | | | root cause View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=4111812#... Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&a...