java - Jsp form post pass an empty object to Spring controller -

in current controller fill userwrapper collection of users haven't access use application , send attribute jsp render.

@requestmapping(value = "/cockpit")     public string cockpit(model model, userwrapper receiveduserwrapper) {         siftoutenabled(receiveduserwrapper);          try {             list<user> users = userservice.findalluserswhonotaccepted();             userwrapper userwrapper = new userwrapper();             userwrapper.setusers(users);             model.addattribute("wrapper", userwrapper);             model.addattribute("users", userwrapper.getusers());         } catch (usersnotfoundexception e) {         }          return "cockpit";     } 

in jsp exists checkboxes binded user objects of userwrapper collection users. jsp page like:

<form:form method="post" commandname="wrapper" action="cockpit">         <table>             <tr>                 <th>id</th>                 <th>mail</th>                 <th>pass</th>                 <th>registrationdate</th>                 <th></th>             </tr>             <c:foreach items="${users}" var="user" varstatus="loop">                 <tr>                     <td>${user.id}</td>                     <td>${user.email}</td>                     <td>${user.password}</td>                     <td>${user.registrationdate}</td>                     <td><form:checkbox path="users[${loop.index}].enabled" />                 </tr>             </c:foreach>         </table>         <input type="submit" name="submit" value="submit" />     </form:form> 

this jsp page render proper result:

id  mail    pass    registrationdate     1   market@test.ra  pass    2016-02-02 21:46:40.0    2   tara@ra.ra  passwd  2016-02-03 20:37:18.0    

near every line exists checbox, when check lines, , send post controller, there catch these values? checkboxes work.

[user [id=0, email=null, password=null, enabled=true],  user [id=0, email=null, password=null, enabled=false]] 

why values null or 0? here userwrapper class, , user consrtuctor:

public class user implements serializable { ... public user(long id, string email, string password, date registrationdate, boolean enabled) {         this.setemail(email);         this.setpassword(password);         this.registrationdate = registrationdate;         this.setenabled(enabled);         roles = new hashset<>();     } ... }  public class userwrapper {      private boolean checked;     private list<user> users;  ... } 

update ask: how send object controller jsp, change object there , send changed object controller...

update

public class springmvcintializer extends abstractannotationconfigdispatcherservletinitializer {      @override     protected class<?>[] getrootconfigclasses() {         return new class[] { applicationconfig.class };     }      @override     protected class<?>[] getservletconfigclasses() {         return new class<?>[] { webmvcconfig.class };     }      @override     protected string[] getservletmappings() {         return new string[] { "/" };     }  } 

problem in jsp code, there checkbox sends form data in name , value pair. hence values checkbox. try updating jsp follows.

<td>${user.id}<input type="hidden" name="users[${loop.index}].id" value="${user.id}"/></td> <td>${user.email}<input type="hidden" name="users[${loop.index}].email" value="${user.email}"/></td> <td>${user.password}<input type="hidden" name="users[${loop.index}].password" value="${user.password}"/></td> <td>${user.registrationdate}<input type="hidden" name="users[${loop.index}].registrationdate" value="${user.registrationdate}"/></td> <td><form:checkbox path="users[${loop.index}].enabled" /> 

edited

for dates need customdateeditor registered in controller class as:

@initbinder public void initbinder(webdatabinder binder) {     customdateeditor editor = new customdateeditor(new simpledateformat("mm/dd/yyyy"), true);     binder.registercustomeditor(date.class, editor); }