<af:selectOneChoice label="Label:" required="true">
      <af:selectItem value="#{someBean.someField.id}" label="#{someBean.someFiled.subject}" />
</af:selectOneChoice>

...
 public   class  SomeBean {

	 private  List someField;

	 public  SomeBean() {
		// Здесь берутся экземпляры типа Bean и кладутся в someField
			}

	 public  List getSomeField() {
		 return  someField;
	}

	 public   void  setSomeField(List field) {
		 this .someField = field;
	}
}

...
 public   class  Bean {

	 private   int  id;
	 private  String subject;

	 public   int  getId() {
		 return  id;
	}

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

	 public  String getSubject() {
		 return  subject;
	}

	 public   void  setSubject(String subject) {
		 this .subject = subject;
	}

}

...
<managed-bean>
	<managed-bean-name>someBean</managed-bean-name>
	<managed-bean- class >somePackage.SomeBean</managed-bean- class >
	<managed-bean-scope>session</managed-bean-scope>
</managed-bean>
...