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

bebon3 do-not-reply at jboss.com
Mon Nov 19 14:52:12 EST 2007

this is my situation

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

   public B getB() {
      return b;

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


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

   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" 
<html xmlns="http://www.w3.org/1999/xhtml"

      Register New Class A
               <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:commandButton value="Register" action="#{register.register}"/>

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'

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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