jsf - Why Managed Bean List becomes including null elements in sessionscoped? -

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i want information contacts , display them in table. used 2 managed beans named personalcontact , businesscontact , 1 abstract class named contact including firstname, lastname, id, email , mphone attributes derives from.also, 1 generic class add beans arraylist. put here businesscontact bean, business xhtml , tablebusiness table , generic class addressbook, files of personal parallel of them.

inputs getting screen assigned attributes of beans when beans go arraylist added, content becomes null. why that? scopes?

here bean:

import javax.faces.bean.managedbean; import javax.faces.bean.viewscoped;  @managedbean @viewscoped public class businesscontact extends contact{     private string companyname,workphone;      public businesscontact() {}      public businesscontact(string companyname, string workphone, string id, string firstname, string lastname, string email, string mphone) {         super(id, firstname, lastname, email, mphone);         this.companyname = companyname;         this.workphone = workphone;     }       /**      * creates new instance of businesscontact      */     public string getcompanyname() {         return companyname;     }      public void setcompanyname(string companyname) {         this.companyname = companyname;     }      public string getworkphone() {         return workphone;     }      public void setworkphone(string workphone) {         this.workphone = workphone;     }         }

here business.xhtml:

<?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:h="http://xmlns.jcp.org/jsf/html"   xmlns:f="http://xmlns.jcp.org/jsf/core"   xmlns:ui="http://xmlns.jcp.org/jsf/facelets">  <h:head>     <title>contact</title>  </h:head>  <h:body>     <h:form>     <h:panelgrid columns="2">       first name:      <h:inputtext id="firstname" required="true"                    requiredmessage="can not blank" value="#{businesscontact.firstname}">      </h:inputtext>      id:      <h:inputtext id="id" required="true"                    requiredmessage="can not blank" value="#{businesscontact.id}">      </h:inputtext>      last name:      <h:inputtext id="lastname" required="true"                    requiredmessage="can not blank" value="#{businesscontact.lastname}">      </h:inputtext>       e-mail:      <h:inputtext id="email" required="true"                    requiredmessage="can not blank" value="#{businesscontact.email}">      </h:inputtext>      mobile phone:      <h:inputtext id="mphone" required="true"                    requiredmessage="can not blank" value="#{businesscontact.mphone}">      </h:inputtext>      company name:      <h:inputtext id="companyname" required="true"                    requiredmessage="can not blank" value="#{businesscontact.companyname}">      </h:inputtext>      work phone:      <h:inputtext id="workphone" required="true"                    requiredmessage="can not blank" value="#{businesscontact.workphone}">      </h:inputtext>      </h:panelgrid>      <h:commandbutton  value="add" id="add" action="#{addressbook.add(businesscontact)}"></h:commandbutton>      <h:commandbutton  value="delete" id="delete" action="#{addressbook.remove(businesscontact)}"></h:commandbutton>     <h:outputlink id="t" value="tablebusiness.xhtml"> click see table</h:outputlink>     <ui:debug hotkey="k" rendered="true"/>   </h:form> </h:body>

this generic class putting beans arraylist:

import java.util.arraylist; import javax.faces.bean.managedbean; import javax.faces.bean.sessionscoped;  @managedbean @sessionscoped public class addressbook <t extends contact> {     private arraylist<t> list = new arraylist<t>();     t clas;      public arraylist<t> getlist() {         return list;     }      public void setlist(arraylist<t> list) {         this.list = list;     }      public void add(t obj) {          this.clas=obj;         //system.out.println(obj.getfirstname()+" ");         list.add(obj);      }     public void remove(t obj)     {        list.remove(obj);     }     /**      * creates new instance of addressbook      */     public addressbook() {}         }

and lastly, xhmtl displaying arraylist in table:

<html xmlns="http://www.w3.org/1999/xhtml"   xmlns:h="http://xmlns.jcp.org/jsf/html"   xmlns:f="http://xmlns.jcp.org/jsf/core"> <h:head>  </h:head> <h:body>     <h:form>         "#{businesscontact.firstname}"        <h:datatable value="#{addressbook.list}" var="businesscontact">         <h:column>                 <f:facet name="header">                     first name                 </f:facet>             <h:outputtext value="#{businesscontact.firstname}">             </h:outputtext>         </h:column>             <h:column>                 <f:facet name="header">                     last name                 </f:facet>                 #{businesscontact.lastname}             </h:column>             <h:column>                 <f:facet name="header">                   mobile phone                 </f:facet>                 #{businesscontact.mphone}             </h:column>              <h:column>                 <f:facet name="header">                   e-mail                 </f:facet>                 #{businesscontact.email}             </h:column>               <h:column>                 <f:facet name="header">                   company name                 </f:facet>                 #{businesscontact.companyname}             </h:column>               <h:column>                 <f:facet name="header">                   work phone                 </f:facet>                 #{businesscontact.workphone}             </h:column>         </h:datatable>     </h:form> </h:body> </html>

you naming var="businesscontact" trying use "businesscontact"

change line 

<h:datatable value="#{addressbook.list}" var="businesscontact">

to 

<h:datatable value="#{addressbook.list}" var="businesscontact">

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