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