p:selectonemenu not working (JSF) - jsf

Question

I have this problem.
I wanted to create selectOneMenu for custom select some data. But it's not working and i really don't know why. I spent cca 5 hours with this problem. I'm so desperate.
So some my code:
But when i will pick some item from selectonemenu, selected_id is still 0. Still, still. I tried to do almost everything but without result.
I tried this:
<p:selectOneMenu value="#{medicinesBean.selectedBranch}" required="true" effect="fade" id="listComboBox">
<f:selectItems value="#{medicinesBean.branchesForComboBox}" var="itm" itemLabel="#{itm.name}" itemValue="#{itm.id}" />
</p:selectOneMenu>
Backing Bean class:
/* private members */
private ArrayList<BranchDTO> branchesForComboBox = new ArrayList<BranchDTO>();
private BranchDTO selectedBranch;
/* getter and setters ... */
also i tried this with SelectItem[] model but result was same. NOT WORK.
Then i tried it like:
<p:selectOneMenu value="#{medicinesBean.selected_id}" required="true" effect="fade" id="listComboBox">
<f:selectItem itemLabel="First" itemValue="1"/>
<f:selectItem itemLabel="Second" itemValue="2"/>
<f:selectItem itemLabel="Third" itemValue="3"/>
<f:selectItem itemLabel="Fouth" itemValue="4"/>
</p:selectOneMenu>
/* private members */
private int selected_id;
But still 0. When i used object like value for selectonemenu, always null exception was always returned. So i will be glad for any advice for this.
Thanks
brw. backing bean is ViewScoped and data from DAO are correctly returned so some bug will be in component selectonemenu.
Thanks BalusC, so here is my implementation
Backing Bean
/**
* #author Sajmon
*/
package OraclBeans;
import DTOs.PobockaDTO;
import DTOs.ZoznamLiekovDTO;
import EJBs.ZoznamLiekovEJB;
import java.io.Serializable;
import java.util.ArrayList;
import javax.annotation.PostConstruct;
import javax.ejb.EJB;
import javax.faces.bean.ManagedBean;
import javax.faces.bean.ViewScoped;
#ManagedBean(name="zoznamLiekovBean")
#ViewScoped
public class ZoznamLiekovBean implements Serializable {
#EJB
private ZoznamLiekovEJB listOfMedicineEJB;
/* private members */
private ArrayList<ZoznamLiekovDTO> listOfMedicines;
private ArrayList<PobockaDTO> branchesForCombobox = new ArrayList<PobockaDTO>();
private ZoznamLiekovDTO selectedItem;
private PobockaDTO selectedBranch;
//private SelectItem[] branchesOptions;
//private SelectItem selectedOption;
private int selected_id;
public ZoznamLiekovBean() {
}
#PostConstruct
private void init() {
branchesForCombobox = listOfMedicineEJB.getBranches();
listOfMedicines = listOfMedicineEJB.getLists();
}
public void test() {
System.out.println("ID: " + selected_id);
}
/*
private SelectItem[] addItemsToOptions() {
SelectItem[] data = new SelectItem[branchesForCombobox.size()];
for (int i = 0; i < branchesForCombobox.size(); i++) {
data[i] = new SelectItem(branchesForCombobox.get(i).getId(), branchesForCombobox.get(i).getNazov());
}
return data;
}
*/
/* getters and setters */
/*
public SelectItem[] getBranchesOptions() {
return branchesOptions;
}
public void setBranchesOptions(SelectItem[] branchesOptions) {
this.branchesOptions = branchesOptions;
}
public void setSelectedOption(SelectItem selectedOption) {
this.selectedOption = selectedOption;
}
public SelectItem getSelectedOption() {
return selectedOption;
}
*/
public ArrayList<PobockaDTO> getBranchesForCombobox() {
return branchesForCombobox;
}
public void setBranchesForCombobox(ArrayList<PobockaDTO> branchesForCombobox) {
this.branchesForCombobox = branchesForCombobox;
}
public ArrayList<ZoznamLiekovDTO> getListOfMedicines() {
return listOfMedicines;
}
public void setListOfMedicines(ArrayList<ZoznamLiekovDTO> listOfMedicines) {
this.listOfMedicines = listOfMedicines;
}
public PobockaDTO getSelectedBranch() {
return selectedBranch;
}
public void setSelectedBranch(PobockaDTO selectedBranch) {
this.selectedBranch = selectedBranch;
}
public ZoznamLiekovDTO getSelectedItem() {
return selectedItem;
}
public void setSelectedItem(ZoznamLiekovDTO selectedItem) {
this.selectedItem = selectedItem;
}
public int getSelected_id() {
return selected_id;
}
public void setSelected_id(int selected_id) {
this.selected_id = selected_id;
}
}
EJB:
/**
* #author Sajmon
*/
package EJBs;
import DTOs.PobockaDTO;
import DTOs.ZoznamLiekovDTO;
import OraclDAO.OracleZoznamLiekovDAO;
import java.io.Serializable;
import java.util.ArrayList;
import javax.ejb.Stateless;
#Stateless
public class ZoznamLiekovEJB implements Serializable {
private OracleZoznamLiekovDAO dao = new OracleZoznamLiekovDAO();
public ArrayList<ZoznamLiekovDTO> getLists() {
return dao.getListOfMedicines();
}
public ArrayList<PobockaDTO> getBranches() {
return dao.getBranchesForCombobox();
}
}
DAO:
/**
* #author Sajmon
*/
package OraclDAO;
import DTOs.PobockaDTO;
import DTOs.ZoznamLiekovDTO;
import OraclDAOFactory.OracleDAOFactory;
import java.io.Serializable;
import java.sql.Connection;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.util.ArrayList;
import java.util.logging.Level;
import java.util.logging.Logger;
public class OracleZoznamLiekovDAO implements Serializable {
private String SELECT_ALL = "SELECT Z.id_zoznamu, P.nazov_pobocky, L.nazov_lieku FROM Zoznam_liekov Z "
+ "JOIN Pobocka P ON (Z.id_pobocky = P.id_pobocky)"
+ "JOIN Liek L ON (Z.id_lieku = L.id_lieku)";
private String SELECT_BRANCHES = "SELECT DISTINCT P.id_pobocky, P.nazov_pobocky FROM Zoznam_liekov Z JOIN Pobocka P ON (Z.id_pobocky = P.id_pobocky)";
public OracleZoznamLiekovDAO() {
}
public ArrayList<PobockaDTO> getBranchesForCombobox() {
ArrayList<PobockaDTO> data = new ArrayList<PobockaDTO>();
PobockaDTO item;
Connection con = null;
PreparedStatement ps = null;
ResultSet rs = null;
try {
con = OracleDAOFactory.getOracleDatabaseConnection();
ps = con.prepareStatement(SELECT_BRANCHES);
rs = ps.executeQuery();
while (rs.next()) {
item = new PobockaDTO();
item.setId(rs.getInt(1));
item.setNazov(rs.getString(2));
data.add(item);
}
System.out.println("Data imported to list successfully.");
}
catch (SQLException ex) {
Logger.getLogger(OracleZoznamLiekovDAO.class.getName()).log(Level.SEVERE, null, ex);
}
finally {
if (con != null) {
try {
con.close();
}
catch (SQLException ex) {
Logger.getLogger(OracleZoznamLiekovDAO.class.getName()).log(Level.SEVERE, null, ex);
}
}
}
return data;
}
public ArrayList<ZoznamLiekovDTO> getListOfMedicines() {
ArrayList<ZoznamLiekovDTO> data = new ArrayList<ZoznamLiekovDTO>();
ZoznamLiekovDTO item;
Connection con = null;
PreparedStatement ps = null;
ResultSet rs = null;
try {
con = OracleDAOFactory.getOracleDatabaseConnection();
ps = con.prepareStatement(SELECT_ALL);
rs = ps.executeQuery();
while (rs.next()) {
item = new ZoznamLiekovDTO();
item.setId(rs.getInt(1));
item.getPobocka().setNazov(rs.getString(2));
item.getLiek().setNazov(rs.getString(3));
data.add(item);
}
System.out.println("List of Medicines imported successfully.");
}
catch (SQLException ex) {
Logger.getLogger(OracleZoznamLiekovDAO.class.getName()).log(Level.SEVERE, null, ex);
}
finally {
if (con != null) {
try {
con.close();
}
catch (SQLException ex) {
Logger.getLogger(OracleZoznamLiekovDAO.class.getName()).log(Level.SEVERE, null, ex);
}
}
}
return data;
}
}
And XHTML:
<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE html>
<html xmlns="http://www.w3.org/1999/xhtml"
xmlns:h="http://java.sun.com/jsf/html"
xmlns:p="http://primefaces.org/ui"
xmlns:f="http://java.sun.com/jsf/core">
<h:head>
<title>Zoznam liekov - prehľad</title>
<link rel="stylesheet" type="text/css" href="../style.css" />
</h:head>
<h:body>
<div id="out">
<h:form id="mainForm">
<p:selectOneMenu value="#{zoznamLiekovBean.selected_id}" required="true" effect="fade" id="zoznamComboBox">
<f:selectItems value="#{zoznamLiekovBean.branchesForCombobox}" var="itm" itemLabel="#{itm.nazov}" itemValue="#{itm.id}"/>
</p:selectOneMenu>
<p:commandButton immediate="true" styleClass="submitClass" value="Generuj zoznam" update="dialogText" actionListener="#{zoznamLiekovBean.test()}"/>
<p:dataTable style="width: 1100px" widgetVar="zoznamLiekovTable" selection="#{zoznamLiekovBean.selectedItem}" selectionMode="single" rowKey="#{item.id}" var="item" value="#{zoznamLiekovBean.listOfMedicines}" rows="5" rowsPerPageTemplate="5,10,15,20"
paginator="true" paginatorTemplate="{RowsPerPageDropdown} {FirstPageLink} {PreviousPageLink} {CurrentPageReport} {NextPageLink}">
<p:column>
<f:facet name="header">ID:</f:facet>
<h:outputText value="#{item.id}"/>
</p:column>
<p:column>
<f:facet name="header">Pobočka:</f:facet>
<h:outputText value="#{item.pobocka.nazov}"/>
</p:column>
<p:column>
<f:facet name="header">Liek:</f:facet>
<h:outputText value="#{item.liek.nazov}"/>
</p:column>
</p:dataTable>
<p:dialog widgetVar="test" showEffect="explode" hideEffect="explode">
<h:outputText id="dialogText" value="#{zoznamLiekovBean.selected_id}"/>
</p:dialog>
</h:form>
</div>
</h:body>
</html>

Answer 1

Remove immediate="true" from the commandButton. You are skipping the whole Apply Request Value phase - Update Model value phase with that. That's why your value is always null or 0.
Check this out