使用seam从selectOneMenu中无法选取一个对象？？？？

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使用seam从selectOneMenu中无法选取一个对象？？？？5

大家帮忙看一下呀，这个问题让我晕了好几周了，身边学seam的太少问好多人都不会，只能请大家帮忙了。

我做了两个实体类，一个Person类，一个Card 类。，对应两个表。
目标是实现从一个页面添加Card ,在这个页面中我要从一个selectOneMeu中选取一个Person对象。可是当我提交addCard.xhtml上的表单时，老是就出问题。后台输出：

15:58:27,015 INFO [lifecycle] WARNING: FacesMessage(s) have been enqueued, but may not have been displayed.
sourceId=cForm:person[severity=(ERROR 2), summary=(value is not valid), detail=(value is not valid)]

我的页面中如下

<h:selectOneMenu value="#{typeHome.instance.category}">
<s:selectItems value="#{categoryAllList.resultList}"
var="category" label="#{category.name}" />
<s:convertEntity />
</h:selectOneMenu>

action 如下：


package org.domain.s.session.my;

import java.util.List;

import javax.persistence.EntityManager;

import org.jboss.seam.ScopeType;
import org.jboss.seam.annotations.Factory;
import org.jboss.seam.annotations.Name;
import org.jboss.seam.annotations.In;
import org.jboss.seam.annotations.Logger;
import org.jboss.seam.annotations.Out;
import org.jboss.seam.annotations.Scope;
import org.jboss.seam.annotations.datamodel.DataModel;
import org.jboss.seam.annotations.datamodel.DataModelSelection;
import org.jboss.seam.log.Log;
import org.jboss.seam.faces.FacesMessages;
import org.domain.s.entity.Person;
import org.hibernate.validator.Length;

@Name("c")
@Scope(ScopeType.SESSION)
public class C {

    @Logger private Log log;
    
    @In FacesMessages facesMessages;
    @In EntityManager entityManager;
    
  
 
   
	 
    private Person person;


	public Person getPerson() {
		return person;
	}

	public void setPerson(Person person) {
		this.person = person;
	}

	public void c()
	{
	
		log.info("c.c() action called with: #{c.value}");

		System.out.print("ddddddddddd"+person);
	}
	
  public String go(){
	  System.out.print("ddddddddddd");
	  return "home";
  }

	@Factory("persons")
	public List<Person> getPersons(){
		List<Person> list = entityManager.createQuery("select p from Person p").getResultList();
		
		return list;
	}
	

	
	
	
}

问题补充：
不好意思。。最上面那个菜单发错了，结构差不多。我的菜单是这样的：
<h:selectOneMenu id="selectedPerson" value="#{c.person}">
<s:selectItems value="#{persons}" var="p" label="#{p.name}" noSelectionLabel="请选择"></s:selectItems>
<s:convertEntity/>
</h:selectOneMenu>

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