JSF页面 - javax.el.PropertyNotFoundException：目标不可达，标识符 '索引' 解析为空

问题描述：

我想要实现在此基础上tutorial与JSF 2.2JSF页面 - javax.el.PropertyNotFoundException：目标不可达，标识符 '索引' 解析为空

faces-config.xml中

简单的JSF页面

<?xml version="1.0"?> 
<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> 
      <supported-locale>es</supported-locale> 
     </locale-config> 
     <resource-bundle> 
      <base-name>com.web.common.internationalization.text</base-name> 
      <var>text</var> 
     </resource-bundle> 
    </application> 
</faces-config>

的index.xhtml

<?xml version='1.0' encoding='UTF-8' ?> 
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd"> 
<html lang="#{index.language}" 
     xmlns="http://www.w3.org/1999/xhtml" xml:lang="en" 
     xmlns:h="http://java.sun.com/jsf/html" 
     xmlns:f="http://java.sun.com/jsf/core" 
     xmlns:ui="http://java.sun.com/jsf/facelets"> 
    <f:view locale="#{index.locale}"> 
     <h:head> 

     </h:head> 
     <h:body> 

      <h:form> 
       <h:selectOneMenu value="#{index.language}" onchange="submit()"> 
        <f:selectItem itemValue="en" itemLabel="English" /> 
        <f:selectItem itemValue="es" itemLabel="Spanish" /> 
       </h:selectOneMenu> 
      </h:form> 

      <address class="top-address"> 
       <span><h:outputText value="#{text['customer.support']}" /></span>&nbsp; 
      </address> 

     </h:body> 
    </f:view> 
</html>

CDI豆

import java.io.Serializable; 
import java.util.Locale; 
import javax.faces.bean.SessionScoped; 
import javax.faces.context.FacesContext; 
import javax.inject.Named; 

@Named 
@SessionScoped 
public class Index implements Serializable 
{ 
    private Locale locale = FacesContext.getCurrentInstance().getViewRoot().getLocale(); 

    public Locale getLocale() 
    { 
     return locale; 
    } 

    public String getLanguage() 
    { 
     return locale.getLanguage(); 
    } 

    public void setLanguage(String language) 
    { 
     this.locale = new Locale(language); 
    } 
}

我在这里添加文字的Java类从教程和属性文件。

但由于某些原因，当我打开网页，我得到错误代码500。你有地方我错了什么想法？

错误堆栈：

javax.el.PropertyNotFoundException: /index.xhtml @15,80 value="#{index.language}": Target Unreachable, identifier 'index' resolved to null 
    at com.sun.faces.facelets.el.TagValueExpression.getType(TagValueExpression.java:100) 
    at com.sun.faces.renderkit.html_basic.HtmlBasicInputRenderer.getConvertedValue(HtmlBasicInputRenderer.java:95) 
    at com.sun.faces.renderkit.html_basic.MenuRenderer.convertSelectOneValue(MenuRenderer.java:201) 
    at com.sun.faces.renderkit.html_basic.MenuRenderer.getConvertedValue(MenuRenderer.java:318) 
    at javax.faces.component.UIInput.getConvertedValue(UIInput.java:1046) 
    at javax.faces.component.UIInput.validate(UIInput.java:976) 
    at javax.faces.component.UIInput.executeValidate(UIInput.java:1249) 
    at javax.faces.component.UIInput.processValidators(UIInput.java:712) 
    at javax.faces.component.UIForm.processValidators(UIForm.java:253) 
    at javax.faces.component.UIComponentBase.processValidators(UIComponentBase.java:1261) 
    at javax.faces.component.UIComponentBase.processValidators(UIComponentBase.java:1261) 
    at javax.faces.component.UIViewRoot.processValidators(UIViewRoot.java:1195) 
    at com.sun.faces.lifecycle.ProcessValidationsPhase.execute(ProcessValidationsPhase.java:76) 
    at com.sun.faces.lifecycle.Phase.doPhase(Phase.java:101) 
    at com.sun.faces.lifecycle.LifecycleImpl.execute(LifecycleImpl.java:198) 
    at javax.faces.webapp.FacesServlet.service(FacesServlet.java:646) 
    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:291) 
    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206) 
    at org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52) 
    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:239) 
    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206) 
    at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:217) 
    at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:106) 
    at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:502) 
    at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:142) 
    at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:79) 
    at org.apache.catalina.valves.AbstractAccessLogValve.invoke(AbstractAccessLogValve.java:616) 
    at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:88) 
    at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:518) 
    at org.apache.coyote.http11.AbstractHttp11Processor.process(AbstractHttp11Processor.java:1091) 
    at org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:673) 
    at org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.doRun(NioEndpoint.java:1500) 
    at org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.run(NioEndpoint.java:1456) 
    at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142) 
    at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617) 
    at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61) 
    at java.lang.Thread.run(Thread.java:745) 
Caused by: javax.el.PropertyNotFoundException: Target Unreachable, identifier 'index' resolved to null

您应该发布与错误相关的服务器日志500 –

发布更新 –

@perissf：关于错误是，关于'解决方案'不是。 – Kukeltje

答

你认错进口 - 的@SessionScoped是从脸包，它应该是从javax.enterprise.context包一个。

或者您可以将@Named切换为@javax.faces.bean.ManagedBean，然后@SessionScoped将匹配（但它不再是CDI bean）。

引用'重复'是一个选项;-)：http://stackoverflow.com/questions/11986847/java-ee-6-javax-annotation-managedbean-vs-javax-inject -named-vs-javax-faces – Kukeltje

现在我在这一行获得NPE'private Locale locale = FacesContext.getCurrentInstance（）。getViewRoot（）。getLocale（）;' –

@Kukeltje：如果每个人都这样做了，那么就不会有StackOverflow我们知道它:-) – fdreger

JSF页面 - javax.el.PropertyNotFoundException：目标不可达，标识符 '索引' 解析为空

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