java - Spring MVC: Cannot convert value of type String to required type Category for property 'category' -

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i have class named project has attribute category. classes project , category have one-to-many relationship.

public class project {   @manytoone(fetch = fetchtype.lazy)   @joincolumn(name="category_id")   private category category;  public class category {   @onetomany(fetch=fetchtype.lazy, mappedby="category")   private set<project> project = new hashset<project>(0);

in jsp have dropdown select category specific project 

 <select class="form-control" name="category" >    <c:foreach items="${categorieslist}" var="category">    <option value="${category.id}"><c:out value="${category.category_name}" /></option>    </c:foreach>  </select>

and controller looks so

@requestmapping(value = "/client/post_project", method = requestmethod.post)   public string postproject(@modelattribute("project") project p){     projectservice.addproject(p);     return "/client/project"; }

i'm trying add project keep having error. can tell me doing wrong?

field error in object 'project' on field 'category': rejected value [3];  codes [typemismatch.project.category,typemismatch.category,typemismatch.model.category,typemismatch]; arguments [org.springframework.context.support.defaultmessagesourceresolvable: codes [project.category,category]; arguments []; default message [category]]; default message [failed convert property value of type 'java.lang.string' required type 'model.category' property 'category'; nested exception java.lang.illegalstateexception: cannot convert value of type [java.lang.string] required type [model.category] property 'category': no matching editors or conversion strategy found]





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