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javax.el.PropertyNotFoundException:无法访问目标，标识符'；未注册邮政'；已解析为空

java jsf jakarta-ee

javax.el.PropertyNotFoundException:无法访问目标，标识符'；未注册邮政'；已解析为空,java,jsf,jakarta-ee,cdi,Java,Jsf,Jakarta Ee,Cdi,我正在尝试实现一个简单的留言簿 当用户单击“提交”时，UnregisteredUserPostCDIBean应该被实例化。但是，我得到了以下例外情况： javax.servlet.ServletException: /guestbook.xhtml @11,57 value="#{unregisteredUserPost.name}": Target Unreachable, identifier 'unregisteredUserPost' resolved to null 如果你能帮我找

我正在尝试实现一个简单的留言簿

当用户单击“提交”时，
UnregisteredUserPost
CDIBean应该被实例化。但是，我得到了以下例外情况：

javax.servlet.ServletException: /guestbook.xhtml @11,57 value="#{unregisteredUserPost.name}": Target Unreachable, identifier 'unregisteredUserPost' resolved to null
如果你能帮我找到问题的根本原因，我会通知你的

guestbook.xhtml

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE html>
<html xmlns="http://www.w3.org/1999/xhtml" xmlns:h="http://xmlns.jcp.org/jsf/html">
  <h:head>
    <title>#{msg.page_title}</title>
    <link rel="stylesheet" type="text/css" href="css.css"/>
  </h:head>
  <h:body>
    <h:form>
        <h:outputText value="#{msg.your_name}&#160;"/>
        <h:inputText value="#{unregisteredUserPost.name}"/>
        <br/><br/>
        <h:outputText value="#{msg.your_msg}"/>
        <br/>
        <h:inputTextarea 
            rows="5" cols="100" value="#{unregisteredUserPost.content}"/>
        <br/><br/>
        <h:commandButton 
            value="#{msg.submit}" action="#{unregisteredUserPost}"/>
    </h:form>
  </h:body>
</html>

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://java.sun.com/xml/ns/javaee"
       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/beans_1_0.xsd">
</beans>

<?xml version="1.0" encoding="UTF-8"?>
<web-app    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" 
            xmlns="http://xmlns.jcp.org/xml/ns/javaee" 
            xsi:schemaLocation="http://xmlns.jcp.org/xml/ns/javaee 
                http://xmlns.jcp.org/xml/ns/javaee/web-app_3_1.xsd" 
            id="WebApp_ID" 
            version="3.1">
    <display-name>guestbook1</display-name>
    <welcome-file-list>
        <welcome-file>guestbook.xhtml</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>*.xhtml</url-pattern>
    </servlet-mapping>
</web-app>

<?xml version="1.0" encoding="UTF-8"?>
<faces-config   xmlns="http://xmlns.jcp.org/xml/ns/javaee"
                xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
                xsi:schemaLocation="http://xmlns.jcp.org/xml/ns/javaee
                    http://xmlns.jcp.org/xml/ns/javaee/web-facesconfig_2_2.xsd"
                    version="2.2">
    <application>
        <locale-config>
            <default-locale>en</default-locale>
        </locale-config>
        <resource-bundle>
            <base-name>MessagesBundle</base-name>
            <var>msg</var>
        </resource-bundle>
    </application>
</faces-config>
AbstractPost.java

package learning.javaee.guestbook;

import java.time.OffsetDateTime;
import javax.enterprise.context.SessionScoped;
import javax.inject.Named;

@Named
@SessionScoped
public class UnregisteredUserPost extends AbstractPost {
    private String name;
    private OffsetDateTime dateTime;

    public UnregisteredUserPost() {}

    public String getName() {
        return name;
    }
    public void setName(String name) {
        this.name = name;
    }
    public OffsetDateTime getDateTime() {
        return dateTime;
    }
    public void setDateTime(OffsetDateTime dateTime) {
        this.dateTime = dateTime;
    }
}

package learning.javaee.guestbook;

import java.io.Serializable;
import java.util.logging.Logger;

import javax.inject.Inject;
import javax.inject.Named;
import javax.interceptor.AroundConstruct;
import javax.interceptor.InvocationContext;

@Named
public abstract class AbstractPost implements Serializable {
    private String content;

    @Inject
    private static Logger log;

    @AroundConstruct
    private void logConstruction(InvocationContext ic) {
        try {
            ic.proceed();
            log.fine("Created " + getClass().getName());
        } catch (Exception e) {
            log.severe(e.toString());
        }
    }

    public String getContent() {
        return content;
    }
    public void setContent(String content) {
        this.content = content;
    }
}
beans.xml

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE html>
<html xmlns="http://www.w3.org/1999/xhtml" xmlns:h="http://xmlns.jcp.org/jsf/html">
  <h:head>
    <title>#{msg.page_title}</title>
    <link rel="stylesheet" type="text/css" href="css.css"/>
  </h:head>
  <h:body>
    <h:form>
        <h:outputText value="#{msg.your_name}&#160;"/>
        <h:inputText value="#{unregisteredUserPost.name}"/>
        <br/><br/>
        <h:outputText value="#{msg.your_msg}"/>
        <br/>
        <h:inputTextarea 
            rows="5" cols="100" value="#{unregisteredUserPost.content}"/>
        <br/><br/>
        <h:commandButton 
            value="#{msg.submit}" action="#{unregisteredUserPost}"/>
    </h:form>
  </h:body>
</html>

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://java.sun.com/xml/ns/javaee"
       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/beans_1_0.xsd">
</beans>

<?xml version="1.0" encoding="UTF-8"?>
<web-app    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" 
            xmlns="http://xmlns.jcp.org/xml/ns/javaee" 
            xsi:schemaLocation="http://xmlns.jcp.org/xml/ns/javaee 
                http://xmlns.jcp.org/xml/ns/javaee/web-app_3_1.xsd" 
            id="WebApp_ID" 
            version="3.1">
    <display-name>guestbook1</display-name>
    <welcome-file-list>
        <welcome-file>guestbook.xhtml</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>*.xhtml</url-pattern>
    </servlet-mapping>
</web-app>

<?xml version="1.0" encoding="UTF-8"?>
<faces-config   xmlns="http://xmlns.jcp.org/xml/ns/javaee"
                xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
                xsi:schemaLocation="http://xmlns.jcp.org/xml/ns/javaee
                    http://xmlns.jcp.org/xml/ns/javaee/web-facesconfig_2_2.xsd"
                    version="2.2">
    <application>
        <locale-config>
            <default-locale>en</default-locale>
        </locale-config>
        <resource-bundle>
            <base-name>MessagesBundle</base-name>
            <var>msg</var>
        </resource-bundle>
    </application>
</faces-config>
web.xml

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE html>
<html xmlns="http://www.w3.org/1999/xhtml" xmlns:h="http://xmlns.jcp.org/jsf/html">
  <h:head>
    <title>#{msg.page_title}</title>
    <link rel="stylesheet" type="text/css" href="css.css"/>
  </h:head>
  <h:body>
    <h:form>
        <h:outputText value="#{msg.your_name}&#160;"/>
        <h:inputText value="#{unregisteredUserPost.name}"/>
        <br/><br/>
        <h:outputText value="#{msg.your_msg}"/>
        <br/>
        <h:inputTextarea 
            rows="5" cols="100" value="#{unregisteredUserPost.content}"/>
        <br/><br/>
        <h:commandButton 
            value="#{msg.submit}" action="#{unregisteredUserPost}"/>
    </h:form>
  </h:body>
</html>

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://java.sun.com/xml/ns/javaee"
       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/beans_1_0.xsd">
</beans>

<?xml version="1.0" encoding="UTF-8"?>
<web-app    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" 
            xmlns="http://xmlns.jcp.org/xml/ns/javaee" 
            xsi:schemaLocation="http://xmlns.jcp.org/xml/ns/javaee 
                http://xmlns.jcp.org/xml/ns/javaee/web-app_3_1.xsd" 
            id="WebApp_ID" 
            version="3.1">
    <display-name>guestbook1</display-name>
    <welcome-file-list>
        <welcome-file>guestbook.xhtml</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>*.xhtml</url-pattern>
    </servlet-mapping>
</web-app>

<?xml version="1.0" encoding="UTF-8"?>
<faces-config   xmlns="http://xmlns.jcp.org/xml/ns/javaee"
                xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
                xsi:schemaLocation="http://xmlns.jcp.org/xml/ns/javaee
                    http://xmlns.jcp.org/xml/ns/javaee/web-facesconfig_2_2.xsd"
                    version="2.2">
    <application>
        <locale-config>
            <default-locale>en</default-locale>
        </locale-config>
        <resource-bundle>
            <base-name>MessagesBundle</base-name>
            <var>msg</var>
        </resource-bundle>
    </application>
</faces-config>


客房1
guestbook.xhtml
Facesservlet
javax.faces.webapp.FacesServlet
1.
Facesservlet
*.xhtml
faces config.xml

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE html>
<html xmlns="http://www.w3.org/1999/xhtml" xmlns:h="http://xmlns.jcp.org/jsf/html">
  <h:head>
    <title>#{msg.page_title}</title>
    <link rel="stylesheet" type="text/css" href="css.css"/>
  </h:head>
  <h:body>
    <h:form>
        <h:outputText value="#{msg.your_name}&#160;"/>
        <h:inputText value="#{unregisteredUserPost.name}"/>
        <br/><br/>
        <h:outputText value="#{msg.your_msg}"/>
        <br/>
        <h:inputTextarea 
            rows="5" cols="100" value="#{unregisteredUserPost.content}"/>
        <br/><br/>
        <h:commandButton 
            value="#{msg.submit}" action="#{unregisteredUserPost}"/>
    </h:form>
  </h:body>
</html>

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://java.sun.com/xml/ns/javaee"
       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/beans_1_0.xsd">
</beans>

<?xml version="1.0" encoding="UTF-8"?>
<web-app    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" 
            xmlns="http://xmlns.jcp.org/xml/ns/javaee" 
            xsi:schemaLocation="http://xmlns.jcp.org/xml/ns/javaee 
                http://xmlns.jcp.org/xml/ns/javaee/web-app_3_1.xsd" 
            id="WebApp_ID" 
            version="3.1">
    <display-name>guestbook1</display-name>
    <welcome-file-list>
        <welcome-file>guestbook.xhtml</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>*.xhtml</url-pattern>
    </servlet-mapping>
</web-app>

<?xml version="1.0" encoding="UTF-8"?>
<faces-config   xmlns="http://xmlns.jcp.org/xml/ns/javaee"
                xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
                xsi:schemaLocation="http://xmlns.jcp.org/xml/ns/javaee
                    http://xmlns.jcp.org/xml/ns/javaee/web-facesconfig_2_2.xsd"
                    version="2.2">
    <application>
        <locale-config>
            <default-locale>en</default-locale>
        </locale-config>
        <resource-bundle>
            <base-name>MessagesBundle</base-name>
            <var>msg</var>
        </resource-bundle>
    </application>
</faces-config>


EN
消息绑定
味精
看起来您的beans.xml中缺少了
bean discovery mode=“all”
。CDI需要这个指令从显式归档注入bean

相关的

看起来还不错。我看到两件事。1.为什么你的bean会话被处理？您想自己处理实例状态吗？将其设置为事件或视图范围就足够了。因为您需要空表单的新实例。2.按钮上的action=“unregisteredUserPost”会发生什么情况？您需要向action属性传递一个方法，可以是一个可以保存帖子的bean；）剩下的没问题，您有一个beans.xml来激活CDI，您可以定义webprofile 3.1和jsf 2.2，这一切都很好。