JSF 2.3第一次找不到viewScoped managedBean

时间：2018-04-18 10:23:34

标签： jsf cdi propertynotfoundexception

当我尝试点击“提交”按钮

时，我有这种错误 
An Error Occurred:
/mail.xhtml @14,72 value="#{emailBean.email}": Target Unreachable, identifier 'emailBean' resolved to null
- Stack Trace
javax.el.PropertyNotFoundException: /mail.xhtml @14,72 value="#{emailBean.email}": Target Unreachable, identifier 'emailBean' resolved to null
    at com.sun.faces.facelets.el.TagValueExpression.getType(TagValueExpression.java:106)
    at com.sun.faces.renderkit.html_basic.HtmlBasicInputRenderer.getConvertedValue(HtmlBasicInputRenderer.java:95)
    at javax.faces.component.UIInput.getConvertedValue(UIInput.java:1122)
    at javax.faces.component.UIInput.validate(UIInput.java:1030)
    at javax.faces.component.UIInput.executeValidate(UIInput.java:1334)
    at javax.faces.component.UIInput.processValidators(UIInput.java:757)
    at javax.faces.component.UIComponentBase.processValidators(UIComponentBase.java:1298)
    at javax.faces.component.UIForm.processValidators(UIForm.java:269)
    at javax.faces.component.UIComponentBase.processValidators(UIComponentBase.java:1298)
    at javax.faces.component.UIComponentBase.processValidators(UIComponentBase.java:1298)
    at javax.faces.component.UIViewRoot.processValidators(UIViewRoot.java:1332)
    at com.sun.faces.lifecycle.ProcessValidationsPhase.execute(ProcessValidationsPhase.java:77)
    at com.sun.faces.lifecycle.Phase.doPhase(Phase.java:100)
    at com.sun.faces.lifecycle.LifecycleImpl.execute(LifecycleImpl.java:201)
    at javax.faces.webapp.FacesServlet.service(FacesServlet.java:670)
    at io.undertow.servlet.handlers.ServletHandler.handleRequest(ServletHandler.java:85)
    at io.undertow.servlet.handlers.security.ServletSecurityRoleHandler.handleRequest(ServletSecurityRoleHandler.java:62)
    at io.undertow.servlet.handlers.ServletDispatchingHandler.handleRequest(ServletDispatchingHandler.java:36)
    at org.wildfly.extension.undertow.security.SecurityContextAssociationHandler.handleRequest(SecurityContextAssociationHandler.java:78)
    at io.undertow.server.handlers.PredicateHandler.handleRequest(PredicateHandler.java:43)
    at io.undertow.servlet.handlers.security.SSLInformationAssociationHandler.handleRequest(SSLInformationAssociationHandler.java:131)
    at io.undertow.servlet.handlers.security.ServletAuthenticationCallHandler.handleRequest(ServletAuthenticationCallHandler.java:57)
    at io.undertow.server.handlers.PredicateHandler.handleRequest(PredicateHandler.java:43)
    at io.undertow.security.handlers.AbstractConfidentialityHandler.handleRequest(AbstractConfidentialityHandler.java:46)
    at io.undertow.servlet.handlers.security.ServletConfidentialityConstraintHandler.handleRequest(ServletConfidentialityConstraintHandler.java:64)
    at io.undertow.security.handlers.AuthenticationMechanismsHandler.handleRequest(AuthenticationMechanismsHandler.java:60)
    at io.undertow.servlet.handlers.security.CachedAuthenticatedSessionHandler.handleRequest(CachedAuthenticatedSessionHandler.java:77)
    at io.undertow.security.handlers.NotificationReceiverHandler.handleRequest(NotificationReceiverHandler.java:50)
    at io.undertow.security.handlers.AbstractSecurityContextAssociationHandler.handleRequest(AbstractSecurityContextAssociationHandler.java:43)
    at io.undertow.server.handlers.PredicateHandler.handleRequest(PredicateHandler.java:43)
    at org.wildfly.extension.undertow.security.jacc.JACCContextIdHandler.handleRequest(JACCContextIdHandler.java:61)
    at io.undertow.server.handlers.PredicateHandler.handleRequest(PredicateHandler.java:43)
    at io.undertow.server.handlers.PredicateHandler.handleRequest(PredicateHandler.java:43)
    at io.undertow.servlet.handlers.ServletInitialHandler.handleFirstRequest(ServletInitialHandler.java:292)
    at io.undertow.servlet.handlers.ServletInitialHandler.access$100(ServletInitialHandler.java:81)
    at io.undertow.servlet.handlers.ServletInitialHandler$2.call(ServletInitialHandler.java:138)
    at io.undertow.servlet.handlers.ServletInitialHandler$2.call(ServletInitialHandler.java:135)
    at io.undertow.servlet.core.ServletRequestContextThreadSetupAction$1.call(ServletRequestContextThreadSetupAction.java:48)
    at io.undertow.servlet.core.ContextClassLoaderSetupAction$1.call(ContextClassLoaderSetupAction.java:43)
    at io.undertow.servlet.api.LegacyThreadSetupActionWrapper$1.call(LegacyThreadSetupActionWrapper.java:44)
    at io.undertow.servlet.api.LegacyThreadSetupActionWrapper$1.call(LegacyThreadSetupActionWrapper.java:44)
    at io.undertow.servlet.api.LegacyThreadSetupActionWrapper$1.call(LegacyThreadSetupActionWrapper.java:44)
    at io.undertow.servlet.api.LegacyThreadSetupActionWrapper$1.call(LegacyThreadSetupActionWrapper.java:44)
    at io.undertow.servlet.api.LegacyThreadSetupActionWrapper$1.call(LegacyThreadSetupActionWrapper.java:44)
    at io.undertow.servlet.handlers.ServletInitialHandler.dispatchRequest(ServletInitialHandler.java:272)
    at io.undertow.servlet.handlers.ServletInitialHandler.access$000(ServletInitialHandler.java:81)
    at io.undertow.servlet.handlers.ServletInitialHandler$1.handleRequest(ServletInitialHandler.java:104)
    at io.undertow.server.Connectors.executeRootHandler(Connectors.java:202)
    at io.undertow.server.HttpServerExchange$1.run(HttpServerExchange.java:805)
    at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
    at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
    at java.lang.Thread.run(Thread.java:745)
Caused by: javax.el.PropertyNotFoundException: Target Unreachable, identifier 'emailBean' resolved to null
    at com.sun.el.parser.AstValue.getTarget(AstValue.java:173)
    at com.sun.el.parser.AstValue.getType(AstValue.java:85)
    at com.sun.el.ValueExpressionImpl.getType(ValueExpressionImpl.java:201)
    at org.jboss.weld.el.WeldValueExpression.getType(WeldValueExpression.java:93)
    at org.jboss.weld.el.WeldValueExpression.getType(WeldValueExpression.java:93)
    at com.sun.faces.facelets.el.TagValueExpression.getType(TagValueExpression.java:104)
    ... 51 more

我使用JSF 2.3，使用@Named而不是@ManagedBean和CDI用于除ViewScope之外的所有范围：

import javax.faces.view.ViewScoped;
import javax.inject.Named;


mail.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:f="http://java.sun.com/jsf/core"
      xmlns:h="http://java.sun.com/jsf/html"
>
<h:head>
    <title>check mail validation</title>
</h:head>
<h:body>
    <h:form>
        <h:panelGrid columns="3">
            <h:outputLabel value="E-mail:" for="emailId"/>
            <h:inputText id="nameemailId" value="#{emailBean.email}" validator="emailValidator"/>
            <h:message for="emailId"/>
        </h:panelGrid>
        <h:commandButton value="Submit" action="#{emailBean.sendEmail()}"/>
    </h:form>
</h:body>
</html>

import javax.annotation.PostConstruct;
import javax.faces.view.ViewScoped;
import javax.inject.Named;
import java.io.Serializable;

@Named
@ViewScoped
public class EmailBean implements Serializable{


    private static final long serialVersionUID = 3247395658736113405L;

    private Email email;


    @PostConstruct
    public void initialize(){
        this.email = new Email("prova");
    }

    public EmailBean(Email email) {
        this.email = email;
    }

    public Email getEmail() {
        return email;
    }

    public void setEmail(Email email) {
        this.email = email;
    }

    public void sendEmail(){
        System.out.println("Email sended");
    }
}

beans.xml中：

 <?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_2_3.xsd"
           version="2.0" bean-discovery-mode="all">
    </beans>

的web.xml 

<?xml version="1.0" encoding="UTF-8"?>
<web-app version="3.0" 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/web-app_3_0.xsd">
    <context-param>
        <param-name>javax.faces.PROJECT_STAGE</param-name>
        <param-value>Development</param-value>
    </context-param>
    <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>/faces/*</url-pattern>
    </servlet-mapping>
    <session-config>
        <session-timeout>
            30
        </session-timeout>
    </session-config>
    <welcome-file-list>
        <welcome-file>faces/index.xhtml</welcome-file>
    </welcome-file-list>
</web-app>

的pom.xml：

<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
    <modelVersion>4.0.0</modelVersion>
    <groupId>com.bluelotussoftware</groupId>
    <artifactId>scope-examples-jsf-2-3</artifactId>
    <version>1.0-SNAPSHOT</version>
    <packaging>war</packaging>
    <name>scope-examples-jsf-2-3</name>
    <properties>
        <endorsed.dir>${project.build.directory}/endorsed</endorsed.dir>
        <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
        <version.wildfly.maven.plugin>1.0.2.Final</version.wildfly.maven.plugin>
        <maven.compiler.source>1.8</maven.compiler.source>
        <maven.compiler.target>1.8</maven.compiler.target>
    </properties>

    <dependencies>
        <dependency>
          <groupId>javax.faces</groupId>
          <artifactId>javax.faces-api</artifactId>
          <version>2.3</version>
          <scope>provided</scope>
        </dependency>
        <dependency>
          <groupId>org.glassfish</groupId>
          <artifactId>javax.faces</artifactId>
          <version>2.3.0</version>
          <scope>provided</scope>
        </dependency>
        <dependency>
            <groupId>javax.servlet</groupId>
            <artifactId>jstl</artifactId>
            <version>1.2</version>
        </dependency>
        <dependency>
            <groupId>taglibs</groupId>
            <artifactId>standard</artifactId>
            <version>1.1.2</version>
        </dependency>
        <dependency>
            <groupId>javax.enterprise</groupId>
            <artifactId>cdi-api</artifactId>
            <version>2.0</version>
            <scope>provided</scope>
        </dependency>
        <dependency>
            <groupId>javax</groupId>
            <artifactId>javaee-api</artifactId>
            <version>8.0</version>
            <scope>provided</scope>
        </dependency>
    </dependencies>

    <build>
        <finalName>${project.artifactId}</finalName>
        <plugins>
            <plugin>
                <groupId>org.apache.maven.plugins</groupId>
                <artifactId>maven-compiler-plugin</artifactId>
                <version>2.5.1</version>
                <configuration>
                    <source>1.6</source>
                    <target>1.6</target>
                    <compilerArguments>
                        <endorseddirs>${endorsed.dir}</endorseddirs>
                    </compilerArguments>
                </configuration>
            </plugin>
            <plugin>
                <groupId>org.apache.maven.plugins</groupId>
                <artifactId>maven-war-plugin</artifactId>
                <version>2.2</version>
                <configuration>
                    <failOnMissingWebXml>false</failOnMissingWebXml>
                </configuration>
            </plugin>
                    <plugin>
                        <groupId>org.wildfly.plugins</groupId>
                        <artifactId>wildfly-maven-plugin</artifactId>
                        <version>${version.wildfly.maven.plugin}</version>
                    </plugin>
                    <plugin>
                        <groupId>org.apache.maven.plugins</groupId>
                        <artifactId>maven-war-plugin</artifactId>
                        <configuration>
                            <failOnMissingWebXml>false</failOnMissingWebXml>
                            <attachClasses>true</attachClasses>
                        </configuration>
                    </plugin>
                </plugins>
            </build>

    <repositories>
        <repository>
            <id>java.net</id>
            <name>Java.net Repository</name>
            <url>http://download.java.net/maven/2/</url>
            <layout>default</layout>
        </repository>
    </repositories>
</project>

我在Wildfly 10上进行部署，并且我将读取此指南替换jsf-api和jsf-impl：

step 1 (how to packages jars):

How to install one jar variant of JSF (javax.faces.jar) on WildFly 

step 2 (how to install):

Upgrade JSF / Mojarra in JBoss AS / EAP / WildFly

谢谢你

罗伯特

1 个答案:

答案 0 :(得分：-2)

另一个问题是同样的错误 应该有一个bean.xml 和 faces应用程序的faces-config.xml（JSF） Changing faces-config.xml from 2.2 to 2.3 causes javax.el.PropertyNotFoundException: Target Unreachable, identifier 'bean' resolved to null

ALSO 错误和属性值为null。 检查bean“状态”配置会话或页面...（应该是会话） 如果它不是会话，则每次发出请求时都会丢弃它。 它是错误导致bean类出错的映射 javax.el.PropertyNotFoundException：/mail.xhtml @ 14,72 value =“＃{emailBean.email}”：目标无法访问，标识符'emailBean'已解析为null

====旧信息 - 我相信您面向页面的JSF配置的导航规则应该具有名称，并且应该在您的web.xml中明确说明

这是一个链接到“简单”的J2EE服务器教程页面供JSF解释。

http://tomee.apache.org/examples-trunk/jsf-managedBean-and-ejb/README.html

（注意代码中的调用语法也是如此）

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