Primefaces Picklist is always empty when using Postconstruct

Question

My code below doesn't work, I'm using primefaces picklist and postconstruct annotation to init method with try catch block. However my picklistbean is empty, I tried all the ways to make it work but none of them worked. Can anyone provide me working example for picklist, or in my code am I missing something ? I'm stuck to this problem for so long, I'll be glad if someone helps me.

import java.io.Serializable;
import java.util.ArrayList;
import java.util.List;

import javax.annotation.PostConstruct;
import javax.faces.application.FacesMessage;
import javax.faces.bean.ManagedBean;
import javax.faces.bean.ViewScoped;
import javax.faces.context.FacesContext;

import org.primefaces.event.TransferEvent;
import org.primefaces.model.DualListModel;
import org.springframework.beans.factory.annotation.Autowired;


@ManagedBean(name = "pickListBeanTani")
@ViewScoped
public class PickListBeanTani implements Serializable {

/**
 * 
 */
private static final long serialVersionUID = 1L;

private DualListModel<TrvrTani> tanis;

@ManagedProperty(value = "#{TrvrTaniDAO}")
private TrvrTaniDAO tanidao;

public TrvrTaniDAO getTanidao() {
    return tanidao;
}


public void setTanidao(TrvrTaniDAO tanidao) {
    this.tanidao = tanidao;
}


private List<TrvrTani> sourcetani;
private List<TrvrTani> targettani;

@PostConstruct
public void init(){

    try {
        sourcetani = new ArrayList<TrvrTani>();
        targettani = new ArrayList<TrvrTani>();

        tanidao = new TrvrTaniDAO();
        List<TrvrTani> taniList = tanidao.findAll();
        System.out.println("tanılist" +taniList);
        for (TrvrTani tani : taniList) {
            sourcetani.add(new TrvrTani(tani.getTaniid(), tani.getTaniadi(), tani
                    .getTanikodu()));
        }

        tanis = new DualListModel<TrvrTani>(sourcetani, targettani);

    } catch (Exception e) {
        throw e;
    }

}


public List<TrvrTani> getSourcetani() {
    return sourcetani;
}

public void setSourcetani(List<TrvrTani> sourcetani) {
    this.sourcetani = sourcetani;
}

public List<TrvrTani> getTargettani() {
    return targettani;
}

public void setTargettani(List<TrvrTani> targettani) {
    this.targettani = targettani;
}

public DualListModel<TrvrTani> getTanis() {
    return tanis;
}

public void setTanis(DualListModel<TrvrTani> tanis) {
    this.tanis = tanis;
}


public void onTransferTani(TransferEvent event) {
    StringBuilder builder = new StringBuilder();
    for (Object item : event.getItems()) {
        builder.append(((TrvrTani) item).getTaniadi()).append("<br />");

        int tanisize = tanis.getTarget().size();
        System.out.println(" ************target*************  : "
                + tanis.getTarget().size());
        for (int h = 0; h < tanisize; h++) {

            /* elemanin adi, id si ve kodu */
            String taniadi = tanis.getTarget().get(h).getTaniadi();
            System.out.println(" ************taniadi1*************  : "
                    + taniadi);
            Long taniidp = tanis.getTarget().get(h).getTaniid();
            System.out.println(" ************taniid2*************  : "
                    + taniidp);
            String tanikodu = tanis.getTarget().get(h).getTanikodu();
            System.out.println(" ************tanikodu3*************  : "
                    + tanikodu);
        }

    }

    FacesMessage msgtani = new FacesMessage();
    msgtani.setSeverity(FacesMessage.SEVERITY_INFO);
    msgtani.setSummary("Tanı Eklendi");
    msgtani.setDetail(builder.toString());

    FacesContext.getCurrentInstance().addMessage(null, msgtani);
}
}

Answer 1

In PostContruct,your dao class doesn't inject in your bean.Try preRenderView when you want to initialize somethings in your bean.

Also dont use tanidao = new TrvrTaniDAO(); in your bean.TaniDao should be injected by spring with Autowired.

PreRenderView Example

EDIT

Also if you should inject TrvrTaniDAO with jsf managed property.

@ManagedProperty(value = "#{TrvrTaniDAO}")
private TrvrTaniDAO tanidao;