Using ModelAttrbute annotation to submit object from jsp to controller

Question

I'm using spring mvc 3.1.0 with jsp/jstl. To submit object to my controller I'm using the ModelAttribute annotation and all is working fine. But, when I try to submit a complex object to my controller his value is null. This is my object model:

UorgVO.java

public class UorgVO { private String nom; private String nomAbrege; private UorgVO refUniteOrganisParent; //getters&Setters.. }

and there is my jsp page:

<form:form method="post" action="saveUorg.html" modelAttribute="uorg" > <table> <tr> <th>Nom</th> <th>Nom abregé</th> <th>Unité père</th> </tr> <tr> <td><input type="text" path="nom" name="nom"/></td> <td><input type="text" path="nomAbrege" name="nomAbrege"/></td> <td> <select id="refUniteOrganisParent" name="refUniteOrganisParent" path="refUniteOrganisParent"> <option value="null"> --- </option> <c:forEach items="${listeuos}" var="uorgg" varStatus="status" > <option value="${uorgg}">${uorgg} </option> </c:forEach> </select> </td> </tr> </table> <input type="submit" value="Enregistrer uorg"/> </form:form>

And my controller is:

@RequestMapping(value ="/saveUorg", method = RequestMethod.POST) public ModelAndView saveUorg(@ModelAttribute("uorg") UorgVO uorg,BindingResult result) { System.out.println("My foreign attribute is:" +uorg.getRefUniteOrganisParent()); return new ModelAndView("uorg_recherche"); }

And the printed value is null, but the other attributes of my object are submitted.

Thank's in advance for help

Not sure of the answer, but there looks to be a syntactic error in your JSP - on the line <input type="submit" value="Enregistrer uorg" <BQ> you don't close the input tag, and the <BQ> tag looks like it shouldn't be there. — robjohncox
– robjohncox, Commented Jul 3, 2013 at 15:01
Using Firebug or similar, can you confirm that your browser is definitely sending the refUniteOrganisParent=value parameter when you submit? Also, you won't be able to bind this value directly to a UorgVO - because the transmitted value will be a string. You'll need to register a PropertyEditor in the controller which will convert the transmitted string to a UorgVO. See this example — Will Keeling
– Will Keeling, Commented Jul 5, 2013 at 10:47
Yes, i used a converter to solve the problem with ConversionServiceFactoryBean Service i'm writing the answer on the post. Thank you Will Keeling. — Mouhie
– Mouhie, Commented Jul 5, 2013 at 10:55

Mouhie · Accepted Answer · 2013-07-05 11:09:37Z

I solved the problem, i hope that it gonna help other users who has the same problem. By using the service of ConversionServiceFactoryBean. First, i used the ' form:select ' and 'form:input' , there is my new jsp code :

<td><form:input path="email" type="text"/></td> <td> <form:select path="refUniteOrganisParent.id" items="${listeuos}" itemValue="id" itemLabel="nom"/> </td>

As you can see i retried the id value of the selected item.

Secondly i used this converter:

public class UorgConverter implements Converter<Long, UorgVO>{ @Autowired private UorgService uo; @Override public UorgVO convert(Long id) { // actions dealing with the service, to retrieve Uorg object from the id sended by the jsp page return uorgItem; } }

After that i configure my xml file by doing this:

<mvc:annotation-driven conversion-service="conversionService"/> <bean id="conversionService" class="my.package.ConversionServiceFactoryBean"> <property name="converters"> <list> <bean class="converter.package.location.UorgConverter"></bean> <!--List of my converters --> </list> </property> </bean>

Thank's to everybody who participates in this post to solve the problem.

Mouhie.

user902691 · Accepted Answer · 2013-07-03 16:13:50Z

0

If you go to the site with form, you should send model. The best way is return new ModelAndView("site","uorg", new UorgVO()) from your controler where method = GET.