[jboss-user] [JBoss Seam] - I have a problem with selectOneMenu

Mon Nov 19 14:52:12 EST 2007

this is my situation

pubic Class A {
 private int id;
 private B b;

   @ManyToOne
   public B getB() {
      return b;
   }

   public void setB(B newB) {
      this.b = newB;
   }

}

public Class B {
   private String name;
   private int id;

   @Id 
   @GeneratedValue(strategy=GenerationType.AUTO)
   public int getId() {
      return id;
   }

   public void setId(int newId) {
      this.id = newId;
   }

   public String getName()
   {
      return name;
   }

   public void setName(String name)
   {
      this.name = name;
   }

}

I use JBoos4.2, seam, java 1.6, jsf1.2

Now is my problem:

when i try to persist class A with subobject B with my jsf page:

<?xml version="1.0" encoding="utf-8"?>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" 
                      "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml"
      xmlns:s="http://jboss.com/products/seam/taglib"
      xmlns:h="http://java.sun.com/jsf/html"
      xmlns:f="http://java.sun.com/jsf/core">

      Register New Class A

      <f:view>

         <h:form>

            <s:validateAll>
               <h:panelGrid columns="2">

                  Username: <h:inputText value="#{A.username}" required="true"/>
                  Real Name: <h:inputText value="#{A.name}" required="true"/>
                  Password: <h:inputSecret value="#{A.password}" required="true"/>
                  country: <h:selectOneMenu value="#{A.b.id}">
                  				<f:selectItems  value="#{register.BList}" />		

                  			</h:selectOneMenu>

               </h:panelGrid>
            </s:validateAll>
            <h:messages/>
            <h:commandButton value="Register" action="#{register.register}"/>
         </h:form>
      </f:view>

where "register" is my menagedBean (with seam annotation)

when i submit my page result is terrible

javax.servlet.ServletException: /register.xhtml @23,72 value="#{A.b.id}": Target Unreachable, 'b' returned null on 'org.jboss.seam.example.registration.A'
	javax.faces.webapp.FacesServlet.service(FacesServlet.java:256)
	org.jboss.web.tomcat.filters.ReplyHeaderFilter.doFilter(ReplyHeaderFilter.java:96)

why seam dont create object "b" in object "a" automaticaly? When I use new operator on class b everything is ok?

please help me

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