java - example - PropertyNotFoundException: destino inalcanzable, ''nulo'' devuelto nulo

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Question

Esta pregunta ya tiene una respuesta aquí:

• Identificando y solucionando javax.el.PropertyNotFoundException: Target Unreachable 8 respuestas

Hola tengo un nuevo problema con Add Form mi problema aquí

WARNING: /test.xhtml @24,173 value="#{userController.users.username}": Target Unreachable, ''null'' returned null
javax.el.PropertyNotFoundException: /test.xhtml @24,173 value="#{userController.users.username}": Target Unreachable, ''null'' returned null
at com.sun.faces.facelets.el.TagValueExpression.getType(TagValueExpression.java:93)
at com.sun.faces.renderkit.html_basic.HtmlBasicInputRenderer.getConvertedValue(HtmlBasicInputRenderer.java:95)
at javax.faces.component.UIInput.getConvertedValue(UIInput.java:1008)
at javax.faces.component.UIInput.validate(UIInput.java:934)
at javax.faces.component.UIInput.executeValidate(UIInput.java:1189)
at javax.faces.component.UIInput.processValidators(UIInput.java:691)
at javax.faces.component.UIComponentBase.processValidators(UIComponentBase.java:1080)
at javax.faces.component.UIForm.processValidators(UIForm.java:243)
at javax.faces.component.UIComponentBase.processValidators(UIComponentBase.java:1080)
at javax.faces.component.UIComponentBase.processValidators(UIComponentBase.java:1080)
at javax.faces.component.UIViewRoot.processValidators(UIViewRoot.java:1180)
at com.sun.faces.lifecycle.ProcessValidationsPhase.execute(ProcessValidationsPhase.java:76)
at com.sun.faces.lifecycle.Phase.doPhase(Phase.java:101)
at com.sun.faces.lifecycle.LifecycleImpl.execute(LifecycleImpl.java:118)
at javax.faces.webapp.FacesServlet.service(FacesServlet.java:312)
at org.apache.catalina.core.StandardWrapper.service(StandardWrapper.java:1523)
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:279)
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:188)
at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:641)
at com.sun.enterprise.web.WebPipeline.invoke(WebPipeline.java:97)
at com.sun.enterprise.web.PESessionLockingStandardPipeline.invoke(PESessionLockingStandardPipeline.java:85)
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:185)
at org.apache.catalina.connector.CoyoteAdapter.doService(CoyoteAdapter.java:325)
at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:226)
at com.sun.enterprise.v3.services.impl.ContainerMapper.service(ContainerMapper.java:165)
at com.sun.grizzly.http.ProcessorTask.invokeAdapter(ProcessorTask.java:791)
at com.sun.grizzly.http.ProcessorTask.doProcess(ProcessorTask.java:693)
at com.sun.grizzly.http.ProcessorTask.process(ProcessorTask.java:954)
at com.sun.grizzly.http.DefaultProtocolFilter.execute(DefaultProtocolFilter.java:170)
at com.sun.grizzly.DefaultProtocolChain.executeProtocolFilter(DefaultProtocolChain.java:135)
at com.sun.grizzly.DefaultProtocolChain.execute(DefaultProtocolChain.java:102)
at com.sun.grizzly.DefaultProtocolChain.execute(DefaultProtocolChain.java:88)
at com.sun.grizzly.http.HttpProtocolChain.execute(HttpProtocolChain.java:76)
at com.sun.grizzly.ProtocolChainContextTask.doCall(ProtocolChainContextTask.java:53)
at com.sun.grizzly.SelectionKeyContextTask.call(SelectionKeyContextTask.java:57)
at com.sun.grizzly.ContextTask.run(ContextTask.java:69)
at com.sun.grizzly.util.AbstractThreadPool$Worker.doWork(AbstractThreadPool.java:330)
at com.sun.grizzly.util.AbstractThreadPool$Worker.run(AbstractThreadPool.java:309)
at java.lang.Thread.run(Thread.java:619)

y mi espalda bean

/*
* To change this template, choose Tools | Templates
* and open the template in the editor.
*/
package com.ejb.controller;
import com.ejbbean.iUserBean;
import com.entity.Igroup;
import com.entity.Iuser;
import java.awt.event.ActionEvent;
import java.io.Serializable;
import java.util.List;
import javax.ejb.EJB;
import javax.faces.application.FacesMessage;
import javax.faces.bean.ManagedBean;
import javax.faces.bean.ViewScoped;
import javax.faces.context.FacesContext;
import javax.faces.model.SelectItem;
/**
*
* @author KencyWindy
*/
@ManagedBean
@ViewScoped
public class UserController implements Serializable{
@EJB
private iUserBean iUserBean;
private Iuser users ;
private Igroup groupa;
public UserController() {
}
public Igroup getGroupa() {
return groupa;
}
public void setGroupa(Igroup groupa) {
this.groupa = groupa;
}
public Iuser getUsers() {
return users;
}
public void setUsers(Iuser users) {
this.users = users;
}
public List<Iuser> getAllUser(){
return iUserBean.retrieve();
}
public void addUser(){
users = new Iuser();
users = iUserBean.createUser(users);
}
public javax.faces.model.SelectItem[] getAllOfGroups(){
SelectItem[] options = null;
List<Igroup> lgroup = iUserBean.retrieveGroup();
if(lgroup.size() > 0 && lgroup != null){
options = new SelectItem[lgroup.size()];
int i = 0 ;
for ( Igroup igroup : lgroup){
options[i++] = new SelectItem(igroup.getGId(), igroup.getGroupname());
}
}
return options;
}
public void submit(ActionEvent event) {
FacesMessage msg = new FacesMessage(FacesMessage.SEVERITY_INFO, "Correct", "Correct");
FacesContext.getCurrentInstance().addMessage(null, msg);
}
}

Clase de Entidad Igroup

/*
* To change this template, choose Tools | Templates
* and open the template in the editor.
*/
package com.entity;
import java.io.Serializable;
import java.util.List;
import javax.persistence.Basic;
import javax.persistence.CascadeType;
import javax.persistence.Column;
import javax.persistence.Entity;
import javax.persistence.GeneratedValue;
import javax.persistence.GenerationType;
import javax.persistence.Id;
import javax.persistence.NamedQueries;
import javax.persistence.NamedQuery;
import javax.persistence.OneToMany;
import javax.persistence.Table;
/**
*
* @author KencyWindy
*/
@Entity
@Table(name = "igroup")
@NamedQueries({
@NamedQuery(name = "Igroup.findAll", query = "SELECT i FROM Igroup i"),
@NamedQuery(name = "Igroup.findByGId", query = "SELECT i FROM Igroup i WHERE i.gId = :gId"),
@NamedQuery(name = "Igroup.findByGroupname", query = "SELECT i FROM Igroup i WHERE i.Groupname = :Groupname"),
@NamedQuery(name = "Igroup.findByAdministrator", query = "SELECT i FROM Igroup i WHERE i.administrator = :administrator"),
@NamedQuery(name = "Igroup.findByReaded", query = "SELECT i FROM Igroup i WHERE i.readed = :readed"),
@NamedQuery(name = "Igroup.findByDeleted", query = "SELECT i FROM Igroup i WHERE i.deleted = :deleted"),
@NamedQuery(name = "Igroup.findByUpdated", query = "SELECT i FROM Igroup i WHERE i.updated = :updated"),
@NamedQuery(name = "Igroup.findByModed", query = "SELECT i FROM Igroup i WHERE i.moded = :moded"),
@NamedQuery(name = "Igroup.findByAdded", query = "SELECT i FROM Igroup i WHERE i.added = :added")})
public class Igroup implements Serializable {
private static final long serialVersionUID = 1L;
@Id
@GeneratedValue(strategy = GenerationType.IDENTITY)
@Basic(optional = false)
@Column(name = "g_id")
private Integer gId;
@Basic(optional = false)
@Column(name = "g_name")
private String Groupname;
@Column(name = "administrator")
private Boolean administrator;
@Basic(optional = false)
@Column(name = "readed")
private boolean readed;
@Column(name = "deleted")
private Boolean deleted;
@Column(name = "updated")
private Boolean updated;
@Column(name = "moded")
private Boolean moded;
@Column(name = "added")
private Boolean added;
@OneToMany(cascade = CascadeType.ALL, mappedBy = "igroup")
private List<Iuser> iuserList;
public Igroup() {
}
public Igroup(Integer gId) {
this.gId = gId;
}
public Igroup(Integer gId, String gName, boolean readed) {
this.gId = gId;
this.Groupname = gName;
this.readed = readed;
}
public Integer getGId() {
return gId;
}
public void setGId(Integer gId) {
this.gId = gId;
}
public String getGroupname() {
return Groupname;
}
public void setGroupname(String Groupname) {
this.Groupname = Groupname;
}
public Boolean getAdministrator() {
return administrator;
}
public void setAdministrator(Boolean administrator) {
this.administrator = administrator;
}
public boolean getReaded() {
return readed;
}
public void setReaded(boolean readed) {
this.readed = readed;
}
public Boolean getDeleted() {
return deleted;
}
public void setDeleted(Boolean deleted) {
this.deleted = deleted;
}
public Boolean getUpdated() {
return updated;
}
public void setUpdated(Boolean updated) {
this.updated = updated;
}
public Boolean getModed() {
return moded;
}
public void setModed(Boolean moded) {
this.moded = moded;
}
public Boolean getAdded() {
return added;
}
public void setAdded(Boolean added) {
this.added = added;
}
public List<Iuser> getIuserList() {
return iuserList;
}
public void setIuserList(List<Iuser> iuserList) {
this.iuserList = iuserList;
}
@Override
public int hashCode() {
int hash = 0;
hash += (gId != null ? gId.hashCode() : 0);
return hash;
}
@Override
public boolean equals(Object object) {
// TODO: Warning - this method won''t work in the case the id fields are not set
if (!(object instanceof Igroup)) {
return false;
}
Igroup other = (Igroup) object;
if ((this.gId == null && other.gId != null) || (this.gId != null && !this.gId.equals(other.gId))) {
return false;
}
return true;
}
@Override
public String toString() {
return "com.entity.Igroup[gId=" + gId + "]";
}
}

Clase de entidad Iuser

/*
* To change this template, choose Tools | Templates
* and open the template in the editor.
*/
package com.entity;
import java.io.Serializable;
import java.util.Date;
import javax.persistence.Basic;
import javax.persistence.Column;
import javax.persistence.Entity;
import javax.persistence.GeneratedValue;
import javax.persistence.GenerationType;
import javax.persistence.Id;
import javax.persistence.JoinColumn;
import javax.persistence.ManyToOne;
import javax.persistence.NamedQueries;
import javax.persistence.NamedQuery;
import javax.persistence.Table;
import javax.persistence.Temporal;
import javax.persistence.TemporalType;
/**
*
* @author KencyWindy
*/
@Entity
@Table(name = "iuser")
@NamedQueries({
@NamedQuery(name = "Iuser.findAll", query = "SELECT i FROM Iuser i"),
@NamedQuery(name = "Iuser.findByUid", query = "SELECT i FROM Iuser i WHERE i.uid = :uid"),
@NamedQuery(name = "Iuser.findByUsername", query = "SELECT i FROM Iuser i WHERE i.username = :username"),
@NamedQuery(name = "Iuser.findByPassword", query = "SELECT i FROM Iuser i WHERE i.password = :password"),
@NamedQuery(name = "Iuser.findByPnum", query = "SELECT i FROM Iuser i WHERE i.pnum = :pnum"),
@NamedQuery(name = "Iuser.findByZipcode", query = "SELECT i FROM Iuser i WHERE i.zipcode = :zipcode"),
@NamedQuery(name = "Iuser.findByState", query = "SELECT i FROM Iuser i WHERE i.state = :state"),
@NamedQuery(name = "Iuser.findByDob", query = "SELECT i FROM Iuser i WHERE i.dob = :dob"),
@NamedQuery(name = "Iuser.findByEmail", query = "SELECT i FROM Iuser i WHERE i.email = :email"),
@NamedQuery(name = "Iuser.findByLastlogin", query = "SELECT i FROM Iuser i WHERE i.lastlogin = :lastlogin"),
@NamedQuery(name = "Iuser.findByRegdate", query = "SELECT i FROM Iuser i WHERE i.regdate = :regdate"),
@NamedQuery(name = "Iuser.findByAddress", query = "SELECT i FROM Iuser i WHERE i.address = :address"),
@NamedQuery(name = "Iuser.findByCity", query = "SELECT i FROM Iuser i WHERE i.city = :city")})
public class Iuser implements Serializable {
private static final long serialVersionUID = 1L;
@Id
@GeneratedValue(strategy = GenerationType.IDENTITY)
@Basic(optional = false)
@Column(name = "uid")
private Integer uid;
@Basic(optional = false)
@Column(name = "username")
private String username;
@Basic(optional = false)
@Column(name = "password")
private String password;
@Basic(optional = false)
@Column(name = "pnum")
private int pnum;
@Basic(optional = false)
@Column(name = "zipcode")
private int zipcode;
@Basic(optional = false)
@Column(name = "state")
private String state;
@Basic(optional = false)
@Column(name = "dob")
@Temporal(TemporalType.TIMESTAMP)
private Date dob;
@Basic(optional = false)
@Column(name = "email")
private String email;
@Column(name = "lastlogin")
@Temporal(TemporalType.TIMESTAMP)
private Date lastlogin;
@Column(name = "regdate")
@Temporal(TemporalType.TIMESTAMP)
private Date regdate;
@Basic(optional = false)
@Column(name = "address")
private String address;
@Basic(optional = false)
@Column(name = "city")
private String city;
@JoinColumn(name = "igroup", referencedColumnName = "g_id")
@ManyToOne(optional = false)
private Igroup igroup;
public Iuser() {
}
public Iuser(Integer uid) {
this.uid = uid;
}
public Iuser(Integer uid, String username, String password, int pnum, int zipcode, String state, Date dob, String email, String address, String city) {
this.uid = uid;
this.username = username;
this.password = password;
this.pnum = pnum;
this.zipcode = zipcode;
this.state = state;
this.dob = dob;
this.email = email;
this.address = address;
this.city = city;
}
public Integer getUid() {
return uid;
}
public void setUid(Integer uid) {
this.uid = uid;
}
public String getUsername() {
return username;
}
public void setUsername(String username) {
this.username = username;
}
public String getPassword() {
return password;
}
public void setPassword(String password) {
this.password = password;
}
public int getPnum() {
return pnum;
}
public void setPnum(int pnum) {
this.pnum = pnum;
}
public int getZipcode() {
return zipcode;
}
public void setZipcode(int zipcode) {
this.zipcode = zipcode;
}
public String getState() {
return state;
}
public void setState(String state) {
this.state = state;
}
public Date getDob() {
return dob;
}
public void setDob(Date dob) {
this.dob = dob;
}
public String getEmail() {
return email;
}
public void setEmail(String email) {
this.email = email;
}
public Date getLastlogin() {
return lastlogin;
}
public void setLastlogin(Date lastlogin) {
this.lastlogin = lastlogin;
}
public Date getRegdate() {
return regdate;
}
public void setRegdate(Date regdate) {
this.regdate = regdate;
}
public String getAddress() {
return address;
}
public void setAddress(String address) {
this.address = address;
}
public String getCity() {
return city;
}
public void setCity(String city) {
this.city = city;
}
public Igroup getIgroup() {
return igroup;
}
public void setIgroup(Igroup igroup) {
this.igroup = igroup;
}
public Integer getGrouplist(){
return this.igroup.getGId();
}
public void setGrouplist(Integer intgroup){
this.igroup = new Igroup(intgroup);
}
@Override
public int hashCode() {
int hash = 0;
hash += (uid != null ? uid.hashCode() : 0);
return hash;
}
@Override
public boolean equals(Object object) {
// TODO: Warning - this method won''t work in the case the id fields are not set
if (!(object instanceof Iuser)) {
return false;
}
Iuser other = (Iuser) object;
if ((this.uid == null && other.uid != null) || (this.uid != null && !this.uid.equals(other.uid))) {
return false;
}
return true;
}
@Override
public String toString() {
return "com.entity.Iuser[uid=" + uid + "]";
}
}

Answer 1

En la clase UserController , declara tu variable así.

public Iuser users = new Iuser();

Porque a menos que use el new Iuser() el objeto no se crea y devolverá un valor null .

Answer 2

value="#{userController.users.username}":
Target Unreachable, ''null'' returned null

O bien #{userController} o #{userController.users} es null .

Mi centavo que #{userController.users} es null . No estás prepoblando en tu frijol. El #{userController} se declara correctamente y se usa como @ManagedBean .

Necesitas rellenarlo previamente en la construcción posterior del frijol:

@PostConstruct
public void init() {
users = new Iuser();
}

Answer 3

Inicialice su clase Iuser en el bean de respaldo de esta manera

public Iuser getUsers() {
if(users == null){
users = (Iuser )super.getInstance(Iuser.Class);
}
return users;
}

esto creará un nuevo objeto Iuser si el objeto se vuelve nulo