接縫應用程序-無法到達目標，標識符'bean解析為null”

Question

我在接縫應用程序中遇到了“ 目標無法到達，標識符'bean解析為null”異常。由於我們公司仍在使用JBoss接縫，因此我試圖熟悉它。

Employee.java

import org.jboss.seam.ScopeType;
import org.jboss.seam.annotations.Name;
import org.jboss.seam.annotations.Scope;

@Name("employee")
@Scope(ScopeType.SESSION)
public class Employee {

    private String username;
    private String password;

    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;
    }

}

EmployeeBean.java

import javax.ejb.Remove;
import javax.ejb.Stateful;

import org.jboss.seam.ScopeType;
import org.jboss.seam.annotations.Name;
import org.jboss.seam.annotations.Scope;

@Stateful
@Name("employeeBean")
@Scope(ScopeType.SESSION)
public class EmployeeBean {

    public void addEmployee(Employee employee) {
        System.out.println(employee.getUsername() + " is added");
    }

    @Remove
    public void remove(){

    }

}

EmployeeController.java

import org.jboss.seam.ScopeType;
import org.jboss.seam.annotations.In;
import org.jboss.seam.annotations.Name;
import org.jboss.seam.annotations.Scope;

@Name("employeeController")
@Scope(ScopeType.SESSION)
public class EmployeeController {

    @In(create = true, required = false)
    private EmployeeBean employeeBean;

    @In(create = true, required = false)
    private Employee employee;

    public void addNewEmployee() {
        employeeBean.addEmployee(this.employee);
    }

    public EmployeeBean getEmployeeBean() {
        return employeeBean;
    }

    public void setEmployeeBean(EmployeeBean employeeBean) {
        this.employeeBean = employeeBean;
    }

    public Employee getEmployee() {
        return employee;
    }

    public void setEmployee(Employee employee) {
        this.employee = employee;
    }

}

Register.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:ui="http://java.sun.com/jsf/facelets"
    xmlns:s="http://jboss.com/products/seam/taglib">

<head></head>
<body>

    <f:view>
        <h:form>
            <h:messages />
            <s:validateAll>
                <h:panelGrid columns="2">
            Username: <h:inputText
                        value="#{employeeController.employee.username}" required="true" />
            Password: <h:inputSecret
                        value="#{employeeController.employee.password}" required="true" />
                </h:panelGrid>
            </s:validateAll>

            <h:commandButton action="#{employeeController.addNewEmployee()}"
                value="Register" />

        </h:form>
    </f:view>

</body>
</html>

我該如何解決？

javax.el.PropertyNotFoundException，消息：“ / register.xhtml @ 17,73 value =“＃{employeeController.employee.username}”：無法到達目標，標識符'employeeController'解析為null“

我正在使用JSF 2.0和Seam 2.2，請讓我知道解決此異常所需的配置文件。

更新：

Web.xml

<?xml version="1.0" encoding="UTF-8"?>
<web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://java.sun.com/xml/ns/javaee" xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd" id="WebApp_ID" version="2.5">
  <display-name>seam</display-name>
  <welcome-file-list>
    <welcome-file>index.html</welcome-file>
    <welcome-file>index.htm</welcome-file>
    <welcome-file>index.jsp</welcome-file>
    <welcome-file>default.html</welcome-file>
    <welcome-file>default.htm</welcome-file>
    <welcome-file>default.jsp</welcome-file>
  </welcome-file-list>
  <servlet>
    <servlet-name>Faces Servlet</servlet-name>
    <servlet-class>javax.faces.webapp.FacesServlet</servlet-class>
    <load-on-startup>1</load-on-startup>
  </servlet>
  <servlet-mapping>
    <servlet-name>Faces Servlet</servlet-name>
    <url-pattern>*.seam</url-pattern>
  </servlet-mapping>
  <context-param>
    <param-name>org.jboss.jbossfaces.JSF_CONFIG_NAME</param-name>
    <param-value>Mojarra-1.2</param-value>
  </context-param>
  <context-param>
    <param-name>org.richfaces.SKIN</param-name>
    <param-value>blueSky</param-value>
  </context-param>
  <listener>
    <listener-class>org.jboss.seam.servlet.SeamListener</listener-class>
  </listener>
  <filter>
    <filter-name>Seam Filter</filter-name>
    <filter-class>org.jboss.seam.servlet.SeamFilter</filter-class>
  </filter>
  <filter-mapping>
    <filter-name>Seam Filter</filter-name>
    <url-pattern>/*</url-pattern>
  </filter-mapping>
  <servlet>
    <servlet-name>Seam Resource Servlet</servlet-name>
    <servlet-class>org.jboss.seam.servlet.SeamResourceServlet</servlet-class>
  </servlet>
  <servlet-mapping>
    <servlet-name>Seam Resource Servlet</servlet-name>
    <url-pattern>/seam/resource/*</url-pattern>
  </servlet-mapping>
  <context-param>
    <param-name>facelets.DEVELOPMENT</param-name>
    <param-value>true</param-value>
  </context-param>
  <context-param>
    <param-name>javax.faces.DEFAULT_SUFFIX</param-name>
    <param-value>.xhtml</param-value>
  </context-param>
  <security-constraint>
    <display-name>Restrict raw XHTML Documents</display-name>
    <web-resource-collection>
      <web-resource-name>XHTML</web-resource-name>
      <url-pattern>*.xhtml</url-pattern>
    </web-resource-collection>
    <auth-constraint/>
  </security-constraint>
</web-app>

Answer 1

目標無法到達，標識符'employeeController'解析為null”表示未讀取EmployeeController並將其放入Seam容器。

因此，您可以做的是調試。 當Seam容器啟動時，它將在已加載的組件（bean）上顯示日志。 嘗試在日志中找到您的EmployeeController。

如果找不到它，請檢查您的根類路徑中是否有seam.properties（一個空文件）。 seam.properties指示Seam將在哪里開始掃描組件。

接縫應用程序-無法到達目標，標識符'bean解析為null”

問題描述

1 個解決方案

解決方案1
0 2016-07-08 10:06:46

接縫應用程序-無法到達目標，標識符&#39;bean解析為null”

問題描述

1 個解決方案

解決方案1 0 2016-07-08 10:06:46

接縫應用程序-無法到達目標，標識符'bean解析為null”

解決方案1
0 2016-07-08 10:06:46