Restfulie server (vRaptor) recebe parametro nulo

<?xml version="1.0" encoding="UTF-8"?>
<web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
	xmlns="http://java.sun.com/xml/ns/javaee" xmlns:web="http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd"
	xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd"
	id="WebApp_ID" version="2.5">
	
	<display-name>vraptor-test</display-name>
	
	<filter>
		<filter-name>vraptor</filter-name>
		<filter-class>br.com.caelum.vraptor.VRaptor</filter-class>
	</filter>

	<filter-mapping>
		<filter-name>vraptor</filter-name>
		<url-pattern>/*</url-pattern>
		<dispatcher>FORWARD</dispatcher>
		<dispatcher>REQUEST</dispatcher>
	</filter-mapping>
	
</web-app>

public class Item {

	private Integer id;
	private String descricao;

	//getters e setters
}

@Resource
@Path("/items")
public class ItemsController {
	
	private ItemStore store;
	private Result result;
	
	public ItemsController(ItemStore store, Result result) {
		this.store = store;
		this.result = result;
	}

	@Path("/{id}")
	@Get
	public void find(Integer id) {
		Item item = store.find(id);
		result.use(xml()).from(item).serialize();
	}
	
	@Path("")
	@Post
	public void create(Item item) {
		System.out.println("ITEM --> " + item); //o item esta nulo
		result.use(xml()).from(item).serialize();
	}
	
}

<item>
  <id>1</id>
  <descricao>Item de teste</descricao>
</item>