p:selectonemenu produces an extra null option and converter fails - jsf

Question

I have a problem with p:selectonemenu. Server Logs and my codes are below.
The problem: I try to code a simple application with CRUD functionality.
h:selectonemenu works as expected. But when I switch to p:selectonemenu I get converter exception.
Normally my options data includes 3 rows in database. I made options printed after initilization as debug purpose, my list is initilized with there elements as normal.
However with p:selectmenu, my list is initialized with there elements as again (proved by syso in the init function.), but an extra selectonemenu option,null one reaches to converter. And it fires exception.
I debugged the application and saw the extra null object there too. My converter is called 3 times with h:selectonemenu, at least 4 times with p:selectmenu.
I could have made a mistake. But is this my mistake or what else?
Glassfish 3.1.2, PM 3.3.1
Server Log (h:selectmenu):
INFO: Hibernate:
select
grup0_.grup_id as grup1_8_,
grup0_.grup_adi as grup2_8_
from
Grup grup0_
INFO: Selectonemenu Option#Init :Test Value 1
INFO: Selectonemenu Option#Init :Test Value 2
INFO: Selectonemenu Option#Init :Test Value 3
INFO: Selectonemenu Option#Converter :Test Value 1
INFO: Selectonemenu Option#Converter :Test Value 2
INFO: Selectonemenu Option#Converter :Test Value 3
Server Log (p:selectmenu):
INFO: Hibernate:
select
grup0_.grup_id as grup1_8_,
grup0_.grup_adi as grup2_8_
from
Grup grup0_
INFO: Selectonemenu Option#Init :Test Value 1
INFO: Selectonemenu Option#Init :Test Value 2
INFO: Selectonemenu Option#Init :Test Value 3
INFO: Selectonemenu Option#Converter :Test Value 1
INFO: Selectonemenu Option#Converter :Test Value 2
INFO: Selectonemenu Option#Converter :Test Value 3
INFO: Hibernate:
select
grup0_.grup_id as grup1_8_,
grup0_.grup_adi as grup2_8_
from
Grup grup0_
INFO: Selectonemenu Option#Init :Test Value 1
INFO: Selectonemenu Option#Init :Test Value 2
INFO: Selectonemenu Option#Init :Test Value 3
INFO: Selectonemenu Option#Converter :Test Value 1
INFO: Selectonemenu Option#Converter :Test Value 2
INFO: Selectonemenu Option#Converter :Test Value 3
**INFO: Selectonemenu Option#Converter :null**
SEVERE: Error Rendering View[/NewFile.xhtml]
javax.faces.convert.ConverterException: getAsString Error
at converters.GrupConverter.getAsString(GrupConverter.java:60)
at org.primefaces.util.ComponentUtils.getValueToRender(ComponentUtils.java:76)
at org.primefaces.component.selectonemenu.SelectOneMenuRenderer.encodeLabel(SelectOneMenuRenderer.java:120)
at org.primefaces.component.selectonemenu.SelectOneMenuRenderer.encodeMarkup(SelectOneMenuRenderer.java:89)
at org.primefaces.component.selectonemenu.SelectOneMenuRenderer.encodeEnd(SelectOneMenuRenderer.java:62)
at javax.faces.component.UIComponentBase.encodeEnd(UIComponentBase.java:875)
at javax.faces.component.UIComponent.encodeAll(UIComponent.java:1764)
at javax.faces.render.Renderer.encodeChildren(Renderer.java:168)
at javax.faces.component.UIComponentBase.encodeChildren(UIComponentBase.java:845)
at javax.faces.component.UIComponent.encodeAll(UIComponent.java:1757)
at javax.faces.component.UIComponent.encodeAll(UIComponent.java:1760)
at com.sun.faces.application.view.FaceletViewHandlingStrategy.renderView(FaceletViewHandlingStrategy.java:402)
at com.sun.faces.application.view.MultiViewHandler.renderView(MultiViewHandler.java:131)
at com.sun.faces.lifecycle.RenderResponsePhase.execute(RenderResponsePhase.java:121)
at com.sun.faces.lifecycle.Phase.doPhase(Phase.java:101)
at com.sun.faces.lifecycle.LifecycleImpl.render(LifecycleImpl.java:139)
at javax.faces.webapp.FacesServlet.service(FacesServlet.java:594)
at org.apache.catalina.core.StandardWrapper.service(StandardWrapper.java:1550)
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:281)
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:175)
at org.apache.catalina.core.StandardPipeline.doInvoke(StandardPipeline.java:655)
at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:595)
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:161)
at org.apache.catalina.connector.CoyoteAdapter.doService(CoyoteAdapter.java:331)
at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:231)
at com.sun.enterprise.v3.services.impl.ContainerMapper$AdapterCallable.call(ContainerMapper.java:317)
at com.sun.enterprise.v3.services.impl.ContainerMapper.service(ContainerMapper.java:195)
at com.sun.grizzly.http.ProcessorTask.invokeAdapter(ProcessorTask.java:860)
at com.sun.grizzly.http.ProcessorTask.doProcess(ProcessorTask.java:757)
at com.sun.grizzly.http.ProcessorTask.process(ProcessorTask.java:1056)
at com.sun.grizzly.http.DefaultProtocolFilter.execute(DefaultProtocolFilter.java:229)
at com.sun.grizzly.DefaultProtocolChain.executeProtocolFilter(DefaultProtocolChain.java:137)
at com.sun.grizzly.DefaultProtocolChain.execute(DefaultProtocolChain.java:104)
at com.sun.grizzly.DefaultProtocolChain.execute(DefaultProtocolChain.java:90)
at com.sun.grizzly.http.HttpProtocolChain.execute(HttpProtocolChain.java:79)
at com.sun.grizzly.ProtocolChainContextTask.doCall(ProtocolChainContextTask.java:54)
at com.sun.grizzly.SelectionKeyContextTask.call(SelectionKeyContextTask.java:59)
at com.sun.grizzly.ContextTask.run(ContextTask.java:71)
at com.sun.grizzly.util.AbstractThreadPool$Worker.doWork(AbstractThreadPool.java:532)
at com.sun.grizzly.util.AbstractThreadPool$Worker.run(AbstractThreadPool.java:513)
at java.lang.Thread.run(Thread.java:722)
WARNING: StandardWrapperValve[Faces Servlet]: PWC1406: Servlet.service() for servlet Faces Servlet threw exception
javax.faces.convert.ConverterException: getAsString Error
at converters.GrupConverter.getAsString(GrupConverter.java:60)
at org.primefaces.util.ComponentUtils.getValueToRender(ComponentUtils.java:76)
at org.primefaces.component.selectonemenu.SelectOneMenuRenderer.encodeLabel(SelectOneMenuRenderer.java:120)
at org.primefaces.component.selectonemenu.SelectOneMenuRenderer.encodeMarkup(SelectOneMenuRenderer.java:89)
at org.primefaces.component.selectonemenu.SelectOneMenuRenderer.encodeEnd(SelectOneMenuRenderer.java:62)
at javax.faces.component.UIComponentBase.encodeEnd(UIComponentBase.java:875)
at javax.faces.component.UIComponent.encodeAll(UIComponent.java:1764)
at javax.faces.render.Renderer.encodeChildren(Renderer.java:168)
at javax.faces.component.UIComponentBase.encodeChildren(UIComponentBase.java:845)
at javax.faces.component.UIComponent.encodeAll(UIComponent.java:1757)
at javax.faces.component.UIComponent.encodeAll(UIComponent.java:1760)
at com.sun.faces.application.view.FaceletViewHandlingStrategy.renderView(FaceletViewHandlingStrategy.java:402)
at com.sun.faces.application.view.MultiViewHandler.renderView(MultiViewHandler.java:131)
at com.sun.faces.lifecycle.RenderResponsePhase.execute(RenderResponsePhase.java:121)
at com.sun.faces.lifecycle.Phase.doPhase(Phase.java:101)
at com.sun.faces.lifecycle.LifecycleImpl.render(LifecycleImpl.java:139)
at javax.faces.webapp.FacesServlet.service(FacesServlet.java:594)
at org.apache.catalina.core.StandardWrapper.service(StandardWrapper.java:1550)
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:281)
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:175)
at org.apache.catalina.core.StandardPipeline.doInvoke(StandardPipeline.java:655)
at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:595)
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:161)
at org.apache.catalina.connector.CoyoteAdapter.doService(CoyoteAdapter.java:331)
at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:231)
at com.sun.enterprise.v3.services.impl.ContainerMapper$AdapterCallable.call(ContainerMapper.java:317)
at com.sun.enterprise.v3.services.impl.ContainerMapper.service(ContainerMapper.java:195)
at com.sun.grizzly.http.ProcessorTask.invokeAdapter(ProcessorTask.java:860)
at com.sun.grizzly.http.ProcessorTask.doProcess(ProcessorTask.java:757)
at com.sun.grizzly.http.ProcessorTask.process(ProcessorTask.java:1056)
at com.sun.grizzly.http.DefaultProtocolFilter.execute(DefaultProtocolFilter.java:229)
at com.sun.grizzly.DefaultProtocolChain.executeProtocolFilter(DefaultProtocolChain.java:137)
at com.sun.grizzly.DefaultProtocolChain.execute(DefaultProtocolChain.java:104)
at com.sun.grizzly.DefaultProtocolChain.execute(DefaultProtocolChain.java:90)
at com.sun.grizzly.http.HttpProtocolChain.execute(HttpProtocolChain.java:79)
at com.sun.grizzly.ProtocolChainContextTask.doCall(ProtocolChainContextTask.java:54)
at com.sun.grizzly.SelectionKeyContextTask.call(SelectionKeyContextTask.java:59)
at com.sun.grizzly.ContextTask.run(ContextTask.java:71)
at com.sun.grizzly.util.AbstractThreadPool$Worker.doWork(AbstractThreadPool.java:532)
at com.sun.grizzly.util.AbstractThreadPool$Worker.run(AbstractThreadPool.java:513)
at java.lang.Thread.run(Thread.java:722)
test.xhtml
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml"
xmlns:h="http://java.sun.com/jsf/html"
xmlns:f="http://java.sun.com/jsf/core"
xmlns:p="http://primefaces.org/ui"
xmlns:ui="http://java.sun.com/jsf/facelets">
<h:head></h:head>
<body>
<h:form>
<p:selectOneMenu id="grup" value="#{grupBean.grup}" converter="grupConverter">
<f:selectItems value="#{grupBean.grupList}" var="grp" itemLabel="#{grp.grup_adi}" itemValue="#{grp}" />
</p:selectOneMenu>
</h:form>
</body>
</html>
Grup.java
package model;
import java.io.Serializable;
import java.util.ArrayList;
import java.util.List;
import javax.persistence.Entity;
import javax.persistence.GeneratedValue;
import javax.persistence.Id;
import javax.persistence.ManyToMany;
#Entity
public class Grup implements Serializable {
/**
*
*/
private static final long serialVersionUID = 8730335332086520080L;
#Id
#GeneratedValue
private Integer grup_id;
private String grup_adi;
#ManyToMany(mappedBy="gruplar")
private List<Kullanici> kullanicilar = new ArrayList<Kullanici>();
public Integer getGrup_id() {
return grup_id;
}
public void setGrup_id(Integer grup_id) {
this.grup_id = grup_id;
}
public String getGrup_adi() {
return grup_adi;
}
public void setGrup_adi(String grup_adi) {
this.grup_adi = grup_adi;
}
public List<Kullanici> getKullanicilar() {
return kullanicilar;
}
public void setKullanicilar(List<Kullanici> kullanicilar) {
this.kullanicilar = kullanicilar;
}
#Override
public int hashCode() {
final int prime = 31;
int result = 1;
result = prime * result + ((grup_id == null) ? 0 : grup_id.hashCode());
return result;
}
#Override
public boolean equals(Object obj) {
if (this == obj)
return true;
if (obj == null)
return false;
if (!(obj instanceof Grup))
return false;
Grup other = (Grup) obj;
if (grup_id == null) {
if (other.grup_id != null)
return false;
} else if (!grup_id.equals(other.grup_id))
return false;
return true;
}
}
GrupConverter.java
package converters;
import model.Grup;
import javax.faces.application.FacesMessage;
import javax.faces.bean.ManagedBean;
import javax.faces.bean.RequestScoped;
import javax.faces.component.UIComponent;
import javax.faces.context.FacesContext;
import javax.faces.convert.Converter;
import javax.faces.convert.ConverterException;
import javax.faces.convert.FacesConverter;
import javax.persistence.EntityManager;
import util.EntityUtil;
#FacesConverter(value = "grupConverter")
public class GrupConverter implements Converter {
EntityManager em = EntityUtil.getEntityManager();
#Override
public Object getAsObject(FacesContext context, UIComponent component,
String deger) {
Grup findGrup = null;
if (deger == null || deger.isEmpty()) {
return null;
}
try {
findGrup = em.find(Grup.class, Integer.parseInt(deger));
// System.out.println(findGrup.);
} catch (Exception e) {
throw new ConverterException(new FacesMessage(String.format(
"Cannot convert %s to Grup", deger)), e);
}
return findGrup;
}
#Override
public String getAsString(FacesContext context, UIComponent component,
Object deger) {
String val = null;
// ....................
Grup d = (Grup) deger;
System.out
.println("Selectonemenu Option#Converter :" + d.getGrup_adi());
// .....................
try {
Grup b = (Grup) deger;
val = Integer.toString(b.getGrup_id());
} catch (Exception e) {
throw new ConverterException(new FacesMessage("getAsString Error"));
}
return val;
}
}
GrupBean.java
package beans;
import java.io.Serializable;
import java.util.List;
import javax.annotation.PostConstruct;
import javax.faces.bean.ManagedBean;
import javax.faces.bean.RequestScoped;
import javax.faces.bean.ViewScoped;
import javax.persistence.EntityManager;
import model.Birim;
import model.Grup;
import util.EntityUtil;
#ManagedBean
#ViewScoped
public class GrupBean implements Serializable{
private static final long serialVersionUID = 2166603645975073743L;
List<Grup> grupList=null;
List<Birim> birimList;
EntityManager em = EntityUtil.getEntityManager();
private boolean edit;
Grup grup=new Grup();
#PostConstruct
public void init()
{
grupList = em.createQuery("from Grup").getResultList();
//birimList=em.createQuery("from Birim").getResultList();
for (Grup grup : grupList) {
System.out.println("Selectonemenu Option#Init :"+grup.getGrup_adi());
}
}
public void add()
{
System.out.println("Add");
em.getTransaction().begin();
em.persist(grup);
em.getTransaction().commit();
System.out.println("End of Add");
grupList = em.createQuery("from Grup").getResultList();
edit = false;
grup = new Grup(); // Reset placeholder.
}
public void edit(Grup grup) {
this.grup = grup;
//System.out.println("Grup Edit"+grup.anAdi());
edit = true;
}
public void save() {
// dao.update(item);
System.out.println("save");
em.getTransaction().begin();
em.merge(grup);
em.getTransaction().commit();
System.out.println("End of save");
edit = false;
grupList = em.createQuery("from Grup").getResultList();
grup = new Grup(); // Reset placeholder.
}
public void delete(Grup grup) {
System.out.println("delete");
em.getTransaction().begin();
em.remove(grup);
em.getTransaction().commit();
System.out.println("End of delete");
grup = new Grup(); // Reset placeholder.
edit = false;
grupList = em.createQuery("from Grup").getResultList();
}
public List<Grup> getGrupList() {
return grupList;
}
public void setGrupList(List<Grup> grupList) {
this.grupList = grupList;
}
public Grup getGrup() {
return grup;
}
public void setGrup(Grup grup) {
this.grup = grup;
}
public boolean isEdit() {
return edit;
}
public List<Birim> getBirimList() {
return birimList;
}
public void setBirimList(List<Birim> birimList) {
this.birimList = birimList;
}
}