Jakarta Faces提交表单报错：messageView解析为null

环境配置 #

• Netbeans 14
• Glassfish 6
• Java EE 7
• Jakarta Faces 3
• Mojarra 3.0.1

错误现象 #

实现用户提交消息并查看总数的表单，点击提交按钮时出现错误，提示Target Unreachable, identifier 'messageView' resolved to null，错误截图如下：

日志信息 #

应用启动日志 #

WELD-000411: Observer method [BackedAnnotatedMethod] public
org.glassfish.jersey.ext.cdi1x.internal.ProcessAllAnnotatedTypes.processAnnotatedType(@Observes
ProcessAnnotatedType, BeanManager) receives events for all
annotated types. Consider restricting events using @WithAnnotations or
a generic type with bounds.|#] WELD-000411: Observer method
[BackedAnnotatedMethod] public
org.glassfish.jms.injection.JMSCDIExtension.processAnnotatedType(@Observes
ProcessAnnotatedType) receives events for all annotated types.
Consider restricting events using @WithAnnotations or a generic type
with bounds.|#] WELD-000411: Observer method [BackedAnnotatedMethod]
org.glassfish.sse.impl.ServerSentEventCdiExtension.processAnnotatedType(@Observes
ProcessAnnotatedType, BeanManager) receives events for all
annotated types. Consider restricting events using @WithAnnotations or
a generic type with bounds.|#] WELD-000146:
BeforeBeanDiscovery.addAnnotatedType(AnnotatedType) used for class
com.ibm.jbatch.container.cdi.BatchProducerBean is deprecated from CDI
1.1!|#] Initializing Soteria 2.0.1 for context '/mavenproject1'|#] Initializing Mojarra 3.0.1 for context '/mavenproject1'|#]

Monitoring jndi:/server/mavenproject1/WEB-INF/faces-config.xml for
modifications|#] Loading application [mavenproject1] at
[/mavenproject1]|#] mavenproject1 was successfully deployed in 4,055
milliseconds.|#]

提交时错误日志 #

/index.xhtml @15,103 value="#{messageView.message.message}": Target
Unreachable, identifier 'messageView' resolved to null
jakarta.el.PropertyNotFoundException: /index.xhtml @15,103
value="#{messageView.message.message}": Target Unreachable, identifier
'messageView' resolved to null at
com.sun.faces.facelets.el.TagValueExpression.getType(TagValueExpression.java:64)
at
com.sun.faces.renderkit.html_basic.HtmlBasicInputRenderer.getConvertedValue(HtmlBasicInputRenderer.java:69)
at
jakarta.faces.component.UIInput.getConvertedValue(UIInput.java:1040)
at jakarta.faces.component.UIInput.validate(UIInput.java:955) at
jakarta.faces.component.UIInput.executeValidate(UIInput.java:1232) at
jakarta.faces.component.UIInput.processValidators(UIInput.java:721)
at jakarta.faces.component.UIForm.processValidators(UIForm.java:217)
at
jakarta.faces.component.UIComponentBase.processValidators(UIComponentBase.java:901)
at
jakarta.faces.component.UIComponentBase.processValidators(UIComponentBase.java:901)
at
jakarta.faces.component.UIViewRoot.processValidators(UIViewRoot.java:1254)
at
com.sun.faces.lifecycle.ProcessValidationsPhase.execute(ProcessValidationsPhase.java:49)
at com.sun.faces.lifecycle.Phase.doPhase(Phase.java:72) at
com.sun.faces.lifecycle.LifecycleImpl.execute(LifecycleImpl.java:159)
at
jakarta.faces.webapp.FacesServlet.executeLifecyle(FacesServlet.java:681)
at jakarta.faces.webapp.FacesServlet.service(FacesServlet.java:437)
at
org.apache.catalina.core.StandardWrapper.service(StandardWrapper.java:1540)
at
org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:217)
at
org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:119)
at
org.apache.catalina.core.StandardPipeline.doInvoke(StandardPipeline.java:611)
at
org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:550)
at com.sun.enterprise.web.WebPipeline.invoke(WebPipeline.java:75) at
org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:114)
at
org.apache.catalina.connector.CoyoteAdapter.doService(CoyoteAdapter.java:332)
at
org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:199)
at
com.sun.enterprise.v3.services.impl.ContainerMapper$HttpHandlerCallable.call(ContainerMapper.java:440)
at
com.sun.enterprise.v3.services.impl.ContainerMapper.service(ContainerMapper.java:144)
at
org.glassfish.grizzly.http.server.HttpHandler.runService(HttpHandler.java:174)
at
org.glassfish.grizzly.http.server.HttpHandler.doHandle(HttpHandler.java:153)
at
org.glassfish.grizzly.http.server.HttpServerFilter.handleRead(HttpServerFilter.java:196)
at
org.glassfish.grizzly.filterchain.ExecutorResolver$9.execute(ExecutorResolver.java:88)
at
org.glassfish.grizzly.filterchain.DefaultFilterChain.executeFilter(DefaultFilterChain.java:246)
at
org.glassfish.grizzly.filterchain.DefaultFilterChain.executeChainPart(DefaultFilterChain.java:178)
at
org.glassfish.grizzly.filterchain.DefaultFilterChain.execute(DefaultFilterChain.java:118)
at
org.glassfish.grizzly.filterchain.DefaultFilterChain.process(DefaultFilterChain.java:96)
at
org.glassfish.grizzly.ProcessorExecutor.execute(ProcessorExecutor.java:51)
at
org.glassfish.grizzly.nio.transport.TCPNIOTransport.fireIOEvent(TCPNIOTransport.java:510)
at
org.glassfish.grizzly.strategies.AbstractIOStrategy.fireIOEvent(AbstractIOStrategy.java:82)
at
org.glassfish.grizzly.strategies.WorkerThreadIOStrategy.run0(WorkerThreadIOStrategy.java:83)
at
org.glassfish.grizzly.strategies.WorkerThreadIOStrategy.access$100(WorkerThreadIOStrategy.java:34)
at
org.glassfish.grizzly.strategies.WorkerThreadIOStrategy$WorkerThreadRunnable.run(WorkerThreadIOStrategy.java:101)
at
org.glassfish.grizzly.threadpool.AbstractThreadPool$Worker.doWork(AbstractThreadPool.java:535)
at
org.glassfish.grizzly.threadpool.AbstractThreadPool$Worker.run(AbstractThreadPool.java:515)
at java.base/java.lang.Thread.run(Thread.java:833) Caused by:
jakarta.el.PropertyNotFoundException: Target Unreachable, identifier
'messageView' resolved to null at
com.sun.el.parser.AstValue.getTarget(AstValue.java:148) at
com.sun.el.parser.AstValue.getType(AstValue.java:62) at
com.sun.el.ValueExpressionImpl.getType(ValueExpressionImpl.java:160)
at
org.jboss.weld.module.web.el.WeldValueExpression.getType(WeldValueExpression.java:93)
at
com.sun.faces.facelets.el.TagValueExpression.getType(TagValueExpression.java:62)
... 42 more

相关代码文件 #

index.xhtml #

<?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">
    <h:head>
    </h:head>
    <h:body>
        <f:view>
            <h:form>
                <h:outputLabel value="Message:"/><h:inputText value="#{messageView.message.message}"/>
                <h:commandButton action="#{messageView.postMessage}" value="Post Message"/>
            </h:form>
        </f:view>
    </h:body>
</html>

MessageView.java #

package my.presentation;

import boundary.MessageFacade;
import entities.Message;
import javax.ejb.EJB;
import javax.inject.Named;
import javax.enterprise.context.RequestScoped;


@Named(value = "messageView")
@RequestScoped
public class MessageView {

    @EJB
    private MessageFacade messageFacade;
    private Message message;

    public MessageView() {
        this.message = new Message();
    }
    
    public Message getMessage(){
        return message;
    }
    
    public int getMessagesCount(){
        return messageFacade.findAll().size();
    }
    
    public String postMessage(){
        this.messageFacade.create(message);
        return "theend";
    }
}

faces-config.xml #

<?xml version='1.0' encoding='UTF-8'?>
<faces-config xmlns="https://jakarta.ee/xml/ns/jakartaee" 
              xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
              xsi:schemaLocation="https://jakarta.ee/xml/ns/jakartaee https://jakarta.ee/xml/ns/jakartaee/web-facesconfig_3_0.xsd"
              version="3.0">

</faces-config>

beans.xml #

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="https://jakarta.ee/xml/ns/jakartaee"
         xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
         xsi:schemaLocation="https://jakarta.ee/xml/ns/jakartaee 
                             https://jakarta.ee/xml/ns/jakartaee/beans_3_0.xsd"
         version="3.0" bean-discovery-mode="annotated">
</beans>

pom.xml #

<dependencies>            
    <dependency>
        <groupId>jakarta.faces</groupId>
        <artifactId>jakarta.faces-api</artifactId>
        <version>3.0.0</version>
        <scope>provided</scope>
    </dependency>
    <dependency>
        <groupId>javax</groupId>
        <artifactId>javaee-web-api</artifactId>
        <version>7.0</version>
        <scope>provided</scope>
    </dependency>
    <dependency>
        <groupId>org.eclipse.persistence</groupId>
        <artifactId>eclipselink</artifactId>
        <version>2.5.1</version>
    </dependency>
</dependencies>

glassfish-web.xml #

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE glassfish-web-app PUBLIC "-//GlassFish.org//DTD GlassFish Application Server 3.1 Servlet 3.0//EN" "http://glassfish.org/dtds/glassfish-web-app_3_0-1.dtd">
<!--
    Copyright (c) 1997, 2018 Oracle and/or its affiliates. All rights reserved.
    
    This program and the accompanying materials are made available under the
    terms of the Eclipse Public License v. 2.0, which is available at
    http://www.eclipse.org/legal/epl-2.0.

    This Source Code may also be made available under the following Secondary
    Licenses when the conditions for such availability set forth in the
    Eclipse Public License v. 2.0 are satisfied: GNU General Public License,
    version 2 with the GNU Classpath Exception, which is available at
    https://www.gnu.org/software/classpath/license.html.

    SPDX-License-Identifier: EPL-2.0 OR GPL-2.0 WITH Classpath-exception-2.0
-->
<glassfish-web-app error-url="">
  <class-loader delegate="true"/>
  <jsp-config>
    <property name="keepgenerated" value="true">
      <description>Keep a copy of the generated servlet class' java code.</description>
    </property>
  </jsp-config>
</glassfish-web-app>

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内容的提问来源于stack exchange，提问作者pollirrata