update of a render component that updates another component

Question

I have a problem that i can't solve. I have my xhtml page:

enter image description here

The problem is that i have a form where i insert the name and select the location of a travel. It renders an external panel "Volo" where the selectionMenu is updated with some values got from DB based on location selected. Next i want to get a value from Volo selection and update the another panel with ID="HE"(is the one called HotelEsc). I'm in trouble with the selectionMenu in "Volo" because i can't get the value into it. Always gives an NullPointException error. Probably the problem is that i'm trying to understand how Update and render work and i am mistaking something about these operations. Hope on your help thank you.

Code of xhtml:






    Add a Default Package


    


        
            

                Name:
                
                

                Locations Available:

                
                    
                    
                

            
        





        

            Volo:
            
                
            

        
        




        
            

                Hotel:
                
                    
                
                

                Escursioni:
                Clicca su view per vedere i dettagli
                
                      #{esc.name}  

                      #{esc.cost}  

                      #{esc.startingDate}  

                      #{esc.endingDate}

Code of related bean:

package beans;

import java.awt.Event;
import java.io.Serializable;
import java.util.ArrayList;

import javax.annotation.PostConstruct;
import javax.ejb.EJB;
import javax.enterprise.context.SessionScoped;
import javax.faces.bean.ManagedBean;
import javax.faces.bean.RequestScoped;
import javax.faces.view.ViewScoped;

import elementManagement.ElementMgr;
import elementManagementDTO.ElementDTO;
import DefaultPackageManagement.DefaultPackageMgr;
import DefaultPackageManagementDTO.DefaultPackageDTO;


@ManagedBean(name="addDefaultPackageBean") //come viene richiamato 
@ViewScoped
public class AddDefaultPackageBean{

    /**
     * 
     */

    @EJB
    private DefaultPackageMgr defpackMgr;
    private DefaultPackageDTO defpackDTO;
    private ArrayList elelisfly;
    private ArrayList elelishotel;
    private ArrayList elelisescursion;
    private ArrayList elelis;
    private ElementDTO[] selectedEscursions;
    private String fly;
    private String hotel;
    private boolean flag=true;
    private boolean flagdopo=true;
    private ArrayList availableLocations;
    private ElementDTO flyElem;

    @EJB
    private ElementMgr elemMgr;



    public ElementDTO[] getSelectedEscursions() {
        return selectedEscursions;
    }
    public void setSelectedEscursions(ElementDTO[] selectedEscursions) {
        this.selectedEscursions = selectedEscursions;
    }
    public AddDefaultPackageBean() {        
        defpackDTO = new DefaultPackageDTO();
    }

    @PostConstruct
    public void init()
    {
        this.elelisfly=new ArrayList();
        this.elelishotel=new ArrayList();
        this.elelisescursion=new ArrayList();
        this.setElelis(elemMgr.getAllElements());
        this.availableLocations=new ArrayList();
        this.flyElem=new ElementDTO();
        for(ElementDTO e:elelis)
        {
                if (this.availableLocations.contains(e.getLocation())==false)
                        {

                         this.availableLocations.add(e.getLocation());  

                        }
        }   
    }


    public String add() {
        this.AssignElemFlyFromSelection();
        this.AssignElemHotelFromSelection();
        this.AssignElemEscursionFromSelection();
        defpackMgr.save(defpackDTO);
        return "/employee/index?faces-redirect=true";
    }

    public void sel()
    {
        System.out.print("ehila" );
        this.setElelis(this.elemMgr.getAllElementsByLocation(this.defpackDTO.getLocation()));
         for(ElementDTO e:elelis)
           {
               System.out.print("elemento della location Haiti "+e.getName());
           }
        this.AssignElemFlyFromSelection();
        System.out.print(this.fly+"Il volo selezionato per la location è "+this.getFlyElem().getName() );
        this.elelisescursion.clear();
        this.elelishotel.clear();

        for(ElementDTO e:elelis)
        {
            if(e.getType().equals("Hotel"))
            {
                 System.out.print("ho un hotel tra gli elementi "+e.getName() );
                if(e.getStartingDate().after(this.flyElem.getStartingDate())&&((e.getEndingDate().before(this.flyElem.getEndingDate()))))
                {
                 System.out.print("ho un hotel tra gli elementi con le date giuste"+e.getName());
                    this.getElelishotel().add(e);

                }
            }
            else
            {

            if(e.getType().equals("Escursion"))
            {
                if(e.getStartingDate().after(this.flyElem.getStartingDate())&&(e.getEndingDate().before(this.flyElem.getEndingDate())))
                {

                    this.getElelishotel().add(e);

                }

            }

            }
        }
    this.setFlag(true);
    this.setFlagdopo(true); 


    }


    public DefaultPackageDTO getDefpackDTO() {
        return defpackDTO;
    }
    public void setDefpackDTO(DefaultPackageDTO defpackDTO) {
        this.defpackDTO = defpackDTO;
    }
    public ArrayList getElelisfly() {
        return elelisfly;
    }
    public void setElelisfly(ArrayList elelisfly) {
        this.elelisfly = elelisfly;
    }
    public ArrayList getElelishotel() {
        return elelishotel;
    }
    public void setElelishotel(ArrayList elelishotel) {
        this.elelishotel = elelishotel;
    }
    public ArrayList getElelisescursion() {
        return elelisescursion;
    }
    public void setElelisescursion(ArrayList elelisescursion) {
        this.elelisescursion = elelisescursion;
    }
    public String getFly() {
        return fly;
    }
    public void setFly(String fly) {
        this.fly = fly;
    }
    public String getHotel() {
        return hotel;
    }
    public void setHotel(String hotel) {
        this.hotel = hotel;
    }

    private void AssignElemFlyFromSelection()
    {
        for (ElementDTO elem:this.elelisfly)
        {
            if(elem.getName().equals(this.fly))
            {
                this.flyElem=elem;
            }
        }
    }

    private void AssignElemHotelFromSelection()
    {
        for (ElementDTO elem:this.elelishotel)
        {
            if(elem.getName().equals(this.hotel))
            {
                this.defpackDTO.getElem().add(elem);
            }
        }
    }

    private void AssignElemEscursionFromSelection()
    {
        for(int i=0;i getElelis() {
    return elelis;
}
public void setElelis(ArrayList elelis) {
    this.elelis = elelis;
}
public ArrayList getAvailableLocations() {
    return availableLocations;
}
public void setAvailableLocations(ArrayList availableLocations) {
    this.availableLocations = availableLocations;
}
public Boolean getFlag() {
    return flag;
}
public void setFlag(Boolean flag) {
    this.flag = flag;
}
public boolean isFlagdopo() {
    return flagdopo;
}
public void setFlagdopo(boolean flagdopo) {
    this.flagdopo = flagdopo;
}
public ElementDTO getFlyElem() {
    return flyElem;
}
public void setFlyElem(ElementDTO flyElem) {
    this.flyElem = flyElem;
}
}

Rotom92 · Accepted Answer

After lots of attempts, i understood how render/update works. I hope the solution with the xhtml here down helps other people with the same problem: The updates have to be done on the components that you want to refresh(for example in my situation the targets of the updates given from chosen values in selections); process has to be used to specificate which components are used to implement the action.






    Add a Default Package



    


                Name:
                
                

                Locations Available:
                
                    
                
            







        

            
            Volo:
            
                
            

            
            


        

        


                Hotel:
                
                    
                
                






                
                      #{esc.name}  

                      #{esc.cost}  

                      #{esc.startingDate}  

                      #{esc.endingDate}

update of a render component that updates another component

Answers (2)

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