spring mvc - how to display an object on jsp page? -

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i m pretty new spring mvc, m trying setup page display user information

i have trouble controler , view.

controler (getdetail returns user object, has email field) :

 @requestmapping("/{code}")  public string get(@pathvariable long code,modelmap model) throws exception {   model.addattribute("user",simpleusermanager.getdetail(code));   return "userdetail";  }

in userdetail.jsp :

<%@ page language="java" contenttype="text/html; charset=iso-8859-1" pageencoding="iso-8859-1"%> <%@ taglib uri="http://www.springframework.org/tags/form" prefix="form"%> <%@ taglib uri="http://java.sun.com/jsp/jstl/core" prefix="c"%> <%@ taglib uri="http://java.sun.com/jsp/jstl/functions" prefix="fn"%>  <html>   <head><title><fmt:message key="title"/></title></head>   <body> user detail : ${user.email}   </body> </html>

but error when go on page :

request processing failed; nested exception java.lang.illegalargumentexception: attribute value must not null

i using spring 3, on tomcat6

so hope can tell me doing wrong ...

thank you

modelmap.addattribute() not permit attribute value null, , throw illegalargumentexception if is.

your controller needs check whether result of simpleusermanager.getdetail(code) returns null, , try , render result if it's not. if is null, need appropriate situation.


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