Primefaces Picklist is always empty when using Postconstruct - jsf

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;