Why Managed Bean List becomes including null elements in sessionscoped?

Question

I want to get some information about contacts and display them in a table. I used two managed beans named by PersonalContact and BusinessContact and one abstract class named by Contact including firstName, lastName, ID, email and mphone attributes which derives from.Also, one generic class to add beans to an arraylist. I put here just BusinessContact as a bean, business as XHTML and tableBusiness as a table and generic class AddressBook, files of personal is parallel of them.

Inputs getting from screen are assigned to attributes of beans but when the beans go to Arraylist to be added, its content becomes null. Why is that? Is that about scopes?

Here is my 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 a 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 is my business.xhtml:




 
    Contact
 
 
    
     
     First Name:
     
     
     ID:
     
     
     Last Name:
     
     

     E-mail:
     
     
     Mobile Phone:
     
     
     Company Name:
     
     
     Work Phone:
     
     

    

    

    
     Click see the table

This is my generic class for putting beans to an arraylist:

import java.util.ArrayList;
import javax.faces.bean.ManagedBean;
import javax.faces.bean.SessionScoped;

@ManagedBean
@SessionScoped
public class AddressBook  {
    private ArrayList list = new ArrayList();
    T clas;

    public ArrayList getList() {
        return list;
    }

    public void setList(ArrayList 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 a new instance of AddressBook
     */
    public AddressBook() {}        
}

And lastly, this xhmtl for displaying arraylist in table:






    
        "#{businessContact.firstName}"
       
        
                
                    First Name
                
            
            
        
            
                
                    Last Name
                
                #{businessContact.lastName}
            
            
                
                  Mobile Phone
                
                #{businessContact.mphone}
             
            
                
                  E-mail
                
                #{businessContact.email}
              
            
                
                  Company Name
                
                #{businessContact.companyName}
              
            
                
                  Work Phone
                
                #{businessContact.workPhone}

Why Managed Bean List becomes including null elements in sessionscoped?

Answers (1)

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