エラー：javax.el.PropertyNotFoundException：ターゲットに到達できません。「null」がnullを返しました
JSFページを実行しているときにこのエラーが発生しました。
javax.el.PropertyNotFoundException：ターゲットに到達できません。「null」がnullを返しました。
警告：/createStaff.xhtml @ 33,125 value = "＃{staffBean.staff.firstName}"：ターゲット到達不能、「null」がnullを返しましたjavax.el.PropertyNotFoundException：/createStaff.xhtml @ 33,125 value = "＃{staffBean.staff。 firstName}」：ターゲットに到達できません。「null」がnullを返しました
Value = "#{staffBean.staff.firstName}"を使用するとエラーが発生する理由がわかりません。上記のvalue = "#{staffBean.userName}"およびvalue = "#{staffBean.passWord}"を使用しても問題はありません。
これは私のcreateStaff.xhtmlです
<?xml version='1.0' encoding='UTF-8' ?>
<!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://xmlns.jcp.org/jsf/html"
xmlns:f="http://xmlns.jcp.org/jsf/core"
xmlns:p="http://primefaces.org/ui">
<h:head>
<title>Create Staff</title>
</h:head>
<h:body>
<f:view>
<h:form>
<p:panel id ="panel" header="Staff Creation">
<p:messages id="msgs" />
<h:panelGrid columns="3" columnClasses="label, value">
<h:outputText value="Username: *" />
<p:inputText id="username" value="#{staffBean.userName}" required="true" label="Username">
</p:inputText>
<p:message for="username" />
<h:outputLabel for="pwd1" value="Password 1: *" />
<p:password id="pwd1" value="#{staffBean.passWord}" match="pwd2" label="Password 1" required="true" feedback="true" />
<p:message for="pwd1" />
<h:outputLabel for="pwd2" value="Password 2: *" />
<p:password id="pwd2" value="#{staffBean.passWord}" label="Password 2" required="true" feedback="true" />
<p:message for="pwd2" />
<h:outputText value="First name: *" />
<p:inputText id="firstname" value="#{staffBean.staff.firstName}" required="true" label="Username">
</p:inputText>
<p:message for="firstname" />
<h:outputText value="Last name: *" />
<p:inputText id="lastname" value="#{staffBean.staff.lastName}" required="true" label="Username">
</p:inputText>
<p:message for="lastname" />
<h:outputText value="Last name: *" />
<p:selectOneRadio id="genderconsole" value="#{staffBean.staff.gender}" required="true">
<f:selectItem itemLabel="Male" itemValue="Male" />
<f:selectItem itemLabel="Female" itemValue="Female" />
</p:selectOneRadio>
<p:message for="genderconsole" />
<p:commandButton value="Create Staff"
id="ajax"
update="panel">
</p:commandButton>
</h:panelGrid>
</p:panel>
</h:form>
</f:view>
</h:body>
</html>
これは私のStaffBean.Javaです
/*
* To change this license header, choose License Headers in Project Properties.
* To change this template file, choose Tools | Templates
* and open the template in the editor.
*/
package managedbean;
import entities.Staff;
import Java.io.IOException;
import Java.io.Serializable;
import Java.util.HashSet;
import Java.util.Set;
import javax.ejb.EJB;
import javax.enterprise.context.SessionScoped;
import javax.faces.FacesException;
import javax.faces.application.FacesMessage;
import javax.faces.context.ExternalContext;
import javax.faces.context.FacesContext;
import javax.faces.view.ViewScoped;
import javax.inject.Named;
import sessionBean.staffSessionBeanLocal;
@Named(value = "staffBean")
@SessionScoped
//@ViewScoped
public class StaffBean implements Serializable {
@EJB
private staffSessionBeanLocal staffSession;
private String userName;
private String passWord;
private String loginStatus;
private Staff staff;
...........
////Code removed
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 String getLoginStatus() {
return loginStatus;
}
public void setLoginStatus(String loginStatus) {
this.loginStatus = loginStatus;
}
public Staff getStaff() {
return staff;
}
public void setStaff(Staff staff) {
this.staff = staff;
}
}
これは私のスタッフのエンティティです。
/*
* To change this license header, choose License Headers in Project Properties.
* To change this template file, choose Tools | Templates
* and open the template in the editor.
*/
package entities;
import Java.io.Serializable;
import Java.util.ArrayList;
import Java.util.List;
import javax.persistence.CascadeType;
import javax.persistence.Entity;
import javax.persistence.FetchType;
import javax.persistence.GeneratedValue;
import javax.persistence.GenerationType;
import javax.persistence.Id;
import javax.persistence.ManyToMany;
@Entity
public class Staff extends User implements Serializable {
private static final long serialVersionUID = 1L;
@Id
@GeneratedValue(strategy = GenerationType.AUTO)
private Long id;
private String imageURL;
@ManyToMany(cascade = {CascadeType.ALL}, fetch = FetchType.EAGER)
private List<Roles> roles = new ArrayList<Roles>();
@Override
public Long getId() {
return id;
}
@Override
public void setId(Long id) {
this.id = id;
}
@Override
public int hashCode() {
int hash = 0;
hash += (id != null ? id.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 Staff)) {
return false;
}
Staff other = (Staff) object;
if ((this.id == null && other.id != null) || (this.id != null && !this.id.equals(other.id))) {
return false;
}
return true;
}
@Override
public String toString() {
return "entities.Staff[ id=" + id + " ]";
}
public String getImageURL() {
return imageURL;
}
public void setImageURL(String imageURL) {
this.imageURL = imageURL;
}
public List<Roles> getRoles() {
return roles;
}
public void setRoles(List<Roles> roles) {
this.roles = roles;
}
}
これは、Staffクラスの拡張元のUserクラスです。
/*
* To change this license header, choose License Headers in Project Properties.
* To change this template file, choose Tools | Templates
* and open the template in the editor.
*/
package entities;
import Java.io.Serializable;
import Java.sql.Timestamp;
import javax.persistence.Entity;
import javax.persistence.GeneratedValue;
import javax.persistence.GenerationType;
import javax.persistence.Id;
import javax.persistence.MappedSuperclass;
@MappedSuperclass
public class User implements Serializable {
private static final long serialVersionUID = 1L;
@Id
@GeneratedValue(strategy = GenerationType.AUTO)
private Long id;
private String password;
private Timestamp joinDate;
private String userType;
private String gender;
private String email;
private String contactNo;
private String firstName;
private String lastName;
private Timestamp dOB;
private String address;
private String accountStatus;
private int numOfFailLogin;
private String maritalStatus;
private String activationCode;
public Long getId() {
return id;
}
public void setId(Long id) {
this.id = id;
}
@Override
public int hashCode() {
int hash = 0;
hash += (id != null ? id.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 User)) {
return false;
}
User other = (User) object;
if ((this.id == null && other.id != null) || (this.id != null && !this.id.equals(other.id))) {
return false;
}
return true;
}
@Override
public String toString() {
return "entities.User[ id=" + id + " ]";
}
public String getPassword() {
return password;
}
public void setPassword(String password) {
this.password = password;
}
public Timestamp getJoinDate() {
return joinDate;
}
public void setJoinDate(Timestamp joinDate) {
this.joinDate = joinDate;
}
public String getUserType() {
return userType;
}
public void setUserType(String userType) {
this.userType = userType;
}
public String getGender() {
return gender;
}
public void setGender(String gender) {
this.gender = gender;
}
public String getEmail() {
return email;
}
public void setEmail(String email) {
this.email = email;
}
public String getContactNo() {
return contactNo;
}
public void setContactNo(String contactNo) {
this.contactNo = contactNo;
}
public String getFirstName() {
return firstName;
}
public void setFirstName(String firstName) {
this.firstName = firstName;
}
public String getLastName() {
return lastName;
}
public void setLastName(String lastName) {
this.lastName = lastName;
}
public Timestamp getdOB() {
return dOB;
}
public void setdOB(Timestamp dOB) {
this.dOB = dOB;
}
public String getAddress() {
return address;
}
public void setAddress(String address) {
this.address = address;
}
public String getAccountStatus() {
return accountStatus;
}
public void setAccountStatus(String accountStatus) {
this.accountStatus = accountStatus;
}
public String getMaritalStatus() {
return maritalStatus;
}
public void setMaritalStatus(String maritalStatus) {
this.maritalStatus = maritalStatus;
}
public int getNumOfFailLogin() {
return numOfFailLogin;
}
public void setNumOfFailLogin(int numOfFailLogin) {
this.numOfFailLogin = numOfFailLogin;
}
public String getActivationCode() {
return activationCode;
}
public void setActivationCode(String activationCode) {
this.activationCode = activationCode;
}
}
エンティティfirstNameにプロパティstaffがありません
更新：
staffobjectはnullであるように見えます。
@PostConstruct
public void init() {
staff = new Stuff();
}
このエラーは、「firstName」にアクセスしているときに到達できないことを示しています。そのため、「スタッフ」はまだ構築されていません。
マネージドBeanにメソッドを追加すると、問題が解決します。
@PostConstruct
public void init() {
staff= new Staff ();
}
なぜそうする必要があるのかをよりよく理解するために、not
スタッフstaff = new Staff（）;