Недопустимый идентификатор цели недопустим
Привет всем Я новый в jsp, и это мой первый проект, который я узнал, управляемый beans, правила навигации и прочее, и я не могу понять, в чем проблема. все мои коды таковы. Пожалуйста, помогите мне, потому что Im сходит с ума, пытаясь найти это. ERROR is/pages/login.jsp(31,2) '# {employee.username}' Target Unreachable, идентификатор 'employee' разрешен null
Employee.java
package com;
public class Employee {
private String username;
private String password;
private String name;
private String department;
private int age;
private double salary;
private boolean canEdit;
public Employee (String username,String password,String name,String department,int age,double salary){
this.username = username;
this.password = password;
this.name = name;
this.department = department;
this.age = age;
this.salary = salary;
canEdit = false;
}
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 getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public String getDepartment() {
return department;
}
public void setDepartment(String department) {
this.department = department;
}
public int getAge() {
return age;
}
public void setAge(int age) {
this.age = age;
}
public double getSalary() {
return salary;
}
public void setSalary(double salary) {
this.salary = salary;
}
public boolean isCanEdit() {
return canEdit;
}
public void setCanEdit(boolean canEdit) {
this.canEdit = canEdit;
}
}
UserData.java
package com;
import java.io.Serializable;
import java.util.ArrayList;
import java.util.Arrays;
public class UserData implements Serializable {
private static final long serialVersionUID = 1L;
private String username;
private String password;
private String name;
private String department;
private int age;
private double salary;
private static final ArrayList<Employee> employees
= new ArrayList<Employee>(Arrays.asList(
new Employee("1","1","John", "Marketing", 30,2000.00),
new Employee("2","2","Robert", "Marketing", 35,3000.00),
new Employee("3","3","Mark", "Sales", 25,2500.00),
new Employee("4","4","Chris", "Marketing", 33,2500.00),
new Employee("5","5","Peter", "Customer Care", 20,1500.00)
));
public ArrayList<Employee> getEmployees() {
return employees;
}
public String addEmployee() {
Employee employee = new Employee(username,password,name,department,age,salary);
employees.add(employee);
return null;
}
public String deleteEmployees(Employee employee) {
employees.remove(employee);
return null;
}
public String editEmployee(Employee employee){
employee.setCanEdit(true);
return null;
}
public String saveEmployees(){
for (Employee employee : employees){
employee.setCanEdit(false);
}
return null;
}
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 getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public String getDepartment() {
return department;
}
public void setDepartment(String department) {
this.department = department;
}
public int getAge() {
return age;
}
public void setAge(int age) {
this.age = age;
}
public double getSalary() {
return salary;
}
public void setSalary(double salary) {
this.salary = salary;
}
public String loginAction(){
String action = null;
if (username.equalsIgnoreCase("admin") && password.equalsIgnoreCase("a"))
action = "loginAdmin";
else
action = "loginUser";
return action;
}
}
home.jsp
<%@ page language="java" contentType="text/html; charset=ISO-8859-1"
pageEncoding="ISO-8859-1"%>
<%@ taglib prefix="f" uri="http://java.sun.com/jsf/core"%>
<%@ taglib prefix="h" uri="http://java.sun.com/jsf/html"%>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<style>
.employeeTable{
border-collapse:collapse;
border:1px solid #000000;
}
.employeeTableHeader{
text-align:center;
background:none repeat scroll 0 0 #B5B5B5;
border-bottom:1px solid #000000;
padding:2px;
}
.employeeTableOddRow{
text-align:center;
background:none repeat scroll 0 0 #FFFFFFF;
}
.employeeTableEvenRow{
text-align:center;
background:none repeat scroll 0 0 #D3D3D3;
}</style>
<meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1">
<title>DataTable</title>
</head>
<body><f:view>
<h2>DataTable Example</h2>
<h:form>
<h:dataTable value="#{userData.employees}" var="employee"
styleClass="employeeTable"
headerClass="employeeTableHeader"
rowClasses="employeeTableOddRow,employeeTableEvenRow">
<h:column>
<f:facet name="header">Name</f:facet>
<h:inputText id="name" value="#{employee.name}"></h:inputText>
</h:column>
<h:column>
<f:facet name="header">Department</f:facet>
<h:inputText id="department" value="#{employee.department}"></h:inputText>
</h:column>
<h:column>
<f:facet name="header">Age</f:facet>
<h:inputText id="age" value="#{employee.age}"></h:inputText>
</h:column>
<h:column>
<f:facet name="header">Salary</f:facet>
<h:inputText id="salary" value="#{employee.salary}"></h:inputText>
</h:column>
<h:column>
<h:commandButton value="Delete"
action="#{userData.deleteEmployee}" >
<f:setPropertyActionListener
target="#{userData.employees}" value="#{employee}" />
</h:commandButton>
</h:column>
</h:dataTable>
<h3>Add Employee</h3>
<hr/>
<table>
<tr>
<td>Name :</td>
<td><h:inputText size="10" value="#{userData.name}" /></td>
</tr>
<tr>
<td>Department :</td>
<td><h:inputText size="20" value="#{userData.department}" /></td>
</tr>
<tr>
<td>Age :</td>
<td><h:inputText size="5" value="#{userData.age}" /></td>
</tr>
<tr>
<td>Salary :</td>
<td><h:inputText size="5" value="#{userData.salary}" /></td>
</tr>
<tr>
<td> </td>
<td><h:commandButton value="Add Employee"
action="#{userData.addEmployee}" /></td>
</tr>
</table>
</h:form></f:view>
</body>
</html>
login.jsp
<%@ page language="java" contentType="text/html; charset=ISO-8859-1"
pageEncoding="ISO-8859-1"%>
<%@ taglib uri="http://java.sun.com/jsf/html" prefix="h" %>
<%@ taglib uri="http://java.sun.com/jsf/core" prefix="f" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1">
<title>Insert title here</title>
</head>
<body>
<f:view>
<b><h:outputText value="USER Login"> </h:outputText></b>
<p>
<h:messages style="color: blue"/></p>
<h:form>
<h:panelGrid columns="2">
<h:dataTable value="#{userData.employees}" var="employee"></h:dataTable>
<%--
<h:dataTable value="#{userData.employees}" var="employee"></h:dataTable>
<h:column>
<h:outputText id="header" value="username"></h:outputText>
<h:inputText id="username" value="#{employee.username}"></h:inputText>
<br><br>
<h:outputText id="header" value="password"></h:outputText>
<h:inputText id="password" value="#{employee.password}"></h:inputText>
</h:column>
--%>
<h:column>
<h:outputText value="username :"></h:outputText>
<h:inputText id="username" value="#{employee.username}">
</h:inputText>
<br>
<h:outputText value="password :"></h:outputText>
<h:inputText id="password" value="#{employee.password}" >
</h:inputText>
</h:column>
</h:panelGrid>
<h:commandButton value="Login" action="#{userData.loginAction}"></h:commandButton><br/>
<h:outputLink value="pages/sign.jsf"><h:outputText value="Go for Sign up."/></h:outputLink>
</h:form>
</f:view>
</body>
</html>
лица-config.xml
<?xml version="1.0" encoding="UTF-8"?>
<faces-config version="1.2" xmlns="http://java.sun.com/xml/ns/javaee"
xmlns:xi="http://www.w3.org/2001/XInclude"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-facesconfig_1_2.xsd">
<managed-bean>
<managed-bean-name>userData</managed-bean-name>
<managed-bean-class>com.UserData</managed-bean-class>
<managed-bean-scope>session</managed-bean-scope>
</managed-bean>
<navigation-rule>
<from-view-id>/pages/login.jsp</from-view-id>
<navigation-case>
<from-outcome>loginAdmin</from-outcome>
<to-view-id>/pages/home.jsp</to-view-id>
</navigation-case>
<navigation-case>
<from-outcome>loginUser</from-outcome>
<to-view-id>/pages/welcome.jsp</to-view-id>
</navigation-case>
</navigation-rule>
</faces-config>
index.jsp
<%@ page language="java" contentType="text/html; charset=ISO-8859-1"
pageEncoding="ISO-8859-1"%>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1">
<title>Insert title here</title>
</head>
<body>
<jsp:forward page="/pages/login.jsf" />
</body>
</html>
Сообщение ERROR
11:45:47,704 WARN [lifecycle] executePhase(PROCESS_VALIDATIONS 3,[email protected]) threw exception
javax.faces.FacesException: /pages/login.jsp(31,2) '#{employee.username}' Target Unreachable, identifier 'employee' resolved to null
at com.sun.faces.lifecycle.ProcessValidationsPhase.execute(ProcessValidationsPhase.java:108)
at com.sun.faces.lifecycle.LifecycleImpl.phase(LifecycleImpl.java:251)
at com.sun.faces.lifecycle.LifecycleImpl.execute(LifecycleImpl.java:117)
at javax.faces.webapp.FacesServlet.service(FacesServlet.java:244)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:290)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
at org.jboss.web.tomcat.filters.ReplyHeaderFilter.doFilter(ReplyHeaderFilter.java:96)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:235)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:230)
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:175)
at org.jboss.web.tomcat.security.SecurityAssociationValve.invoke(SecurityAssociationValve.java:179)
at org.jboss.web.tomcat.security.JaccContextValve.invoke(JaccContextValve.java:84)
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:127)
at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:102)
at org.jboss.web.tomcat.service.jca.CachedConnectionValve.invoke(CachedConnectionValve.java:157)
at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:109)
at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:262)
at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:844)
at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(Http11Protocol.java:583)
at org.apache.tomcat.util.net.JIoEndpoint$Worker.run(JIoEndpoint.java:446)
at java.lang.Thread.run(Unknown Source)
Caused by: org.apache.jasper.el.JspPropertyNotFoundException: /pages/login.jsp(31,2) '#{employee.username}' Target Unreachable, identifier 'employee' resolved to null
at org.apache.jasper.el.JspValueExpression.getType(JspValueExpression.java:61)
at com.sun.faces.renderkit.html_basic.HtmlBasicInputRenderer.getConvertedValue(HtmlBasicInputRenderer.java:81)
at javax.faces.component.UIInput.getConvertedValue(UIInput.java:934)
at javax.faces.component.UIInput.validate(UIInput.java:860)
at javax.faces.component.UIInput.executeValidate(UIInput.java:1065)
at javax.faces.component.UIInput.processValidators(UIInput.java:666)
at javax.faces.component.UIComponentBase.processValidators(UIComponentBase.java:1033)
at javax.faces.component.UIComponentBase.processValidators(UIComponentBase.java:1033)
at javax.faces.component.UIForm.processValidators(UIForm.java:229)
at javax.faces.component.UIComponentBase.processValidators(UIComponentBase.java:1033)
at javax.faces.component.UIViewRoot.processValidators(UIViewRoot.java:662)
at com.sun.faces.lifecycle.ProcessValidationsPhase.execute(ProcessValidationsPhase.java:100)
... 21 more
11:45:47,704 ERROR [[Faces Servlet]] Servlet.service() for servlet Faces Servlet threw exception
org.apache.jasper.el.JspPropertyNotFoundException: /pages/login.jsp(31,2) '#{employee.username}' Target Unreachable, identifier 'employee' resolved to null
at org.apache.jasper.el.JspValueExpression.getType(JspValueExpression.java:61)
at com.sun.faces.renderkit.html_basic.HtmlBasicInputRenderer.getConvertedValue(HtmlBasicInputRenderer.java:81)
at javax.faces.component.UIInput.getConvertedValue(UIInput.java:934)
at javax.faces.component.UIInput.validate(UIInput.java:860)
at javax.faces.component.UIInput.executeValidate(UIInput.java:1065)
at javax.faces.component.UIInput.processValidators(UIInput.java:666)
at javax.faces.component.UIComponentBase.processValidators(UIComponentBase.java:1033)
at javax.faces.component.UIComponentBase.processValidators(UIComponentBase.java:1033)
at javax.faces.component.UIForm.processValidators(UIForm.java:229)
at javax.faces.component.UIComponentBase.processValidators(UIComponentBase.java:1033)
at javax.faces.component.UIViewRoot.processValidators(UIViewRoot.java:662)
at com.sun.faces.lifecycle.ProcessValidationsPhase.execute(ProcessValidationsPhase.java:100)
at com.sun.faces.lifecycle.LifecycleImpl.phase(LifecycleImpl.java:251)
at com.sun.faces.lifecycle.LifecycleImpl.execute(LifecycleImpl.java:117)
at javax.faces.webapp.FacesServlet.service(FacesServlet.java:244)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:290)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
at org.jboss.web.tomcat.filters.ReplyHeaderFilter.doFilter(ReplyHeaderFilter.java:96)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:235)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:230)
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:175)
at org.jboss.web.tomcat.security.SecurityAssociationValve.invoke(SecurityAssociationValve.java:179)
at org.jboss.web.tomcat.security.JaccContextValve.invoke(JaccContextValve.java:84)
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:127)
at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:102)
at org.jboss.web.tomcat.service.jca.CachedConnectionValve.invoke(CachedConnectionValve.java:157)
at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:109)
at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:262)
at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:844)
at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(Http11Protocol.java:583)
at org.apache.tomcat.util.net.JIoEndpoint$Worker.run(JIoEndpoint.java:446)
at java.lang.Thread.run(Unknown Source)
Ответы
Ответ 1
Как сказал BalusC, это уже давно устарело. И в дополнение к ресурсам, о которых он упомянул, я думаю, что вы должны сделать свой собственный блог, где вы найдете все, что вам нужно, чтобы изучить JSF.
Что касается вашей реальной проблемы, обратите внимание, что на странице login.jsp вы закрываете datatable, где вы определили employee var:
<h:dataTable value="#{userData.employees}" var="employee"></h:dataTable>
прямо перед комментарием. И затем вы вызываете
<h:inputText id="username" value="#{employee.username}">
Это очень нормально, что employee var не будет распознан.
