Neither BindingResult nor plain target object for bean name 'command'. Spring exception - spring

Question

i'm starting learning spring MVC3, and i would like to display a simple "search form" here my jsp file
<form:form method="post" action="addGeo.html" >
<table>
<tr>
<td>
<input type="submit" value="<spring:message code="label.addzone"/>"/>
</td>
</tr>
</table>
</form:form>
<form:form method="post" action="maingeo.html" >
<table>
<tr>
<td>
<form:label path="codeZone"><spring:message code="label.area"/></form:label>
</td>
<td>
<form:input path="codeZone" />
</td>
<td>
<form:label path="type"><spring:message code="label.type"/></form:label>
</td>
<td>
<form:input path="type" />
</td>
<td>
<form:label path="codePostal"><spring:message code="label.departement"/></form:label>
</td>
<td>
<form:input path="codePostal" />
</td>
<td>
<input type="submit" value="<spring:message code="label.searchArea"/>"/>
</td>
</tr>
</table>
</form:form>
and here my controller :
#Controller
public class RefGeoController {
#Autowired
private RefGeoService refgeoService;
#RequestMapping("/maingeo")
public String goSearchArea() {
return "maingeo";
}
}
when i go to this url page, i've got this exception : java.lang.IllegalStateException: Neither BindingResult nor plain target object for bean name 'command' available as request attribute . I think that i forgot something in my form or maybe in my controller but i dont know where. Moreover what should i put on my method parameter when i don't want to send specific model to my jsp view?

Answer 1

You need to write an Class, that contains the fields of your form - this kind of class is called Command-Object/Class.
Then in your Controller method, that is responsible for providing the form page, you need to create an instance of this Command-Object, put it in the Model and then let the view render it. The name that is used for the Command-Object in the Model, must match the "command" attribute name of the <form:form command="myCommand"> tag. If you don't have this attribute, than the default name is command.
#Controller public class RefGeoController {
#Autowired private RefGeoService refgeoService;
#RequestMapping("/maingeo")
public ModelAndView goSearchArea() {
return new ModelAndView("maingeo", "searchCommand", new SearchCommand());
}
//only to prevent your next question: How to recive the committed form
#RequestMapping("/maingeo.html", method = RequestMethod.POST)
public ModelAndView handleSearch(SearchCommand searchCommand) {
... implement the search stuff
}
}
<form:form method="post" action="maingeo.html" command="searchCommand">