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Jsf 如何使用自定义facelets taglib将事件对象作为参数传递给动态侦听器？

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Jsf 如何使用自定义facelets taglib将事件对象作为参数传递给动态侦听器？,jsf,primefaces,facelets,taglib,Jsf,Primefaces,Facelets,Taglib,我正在重构我的代码，以使用自定义facelets标记库来“干燥”我的代码 一切正常，但当我需要参数化ajax侦听器操作时，出现了一个异常： Target Unreachable, identifier 'backingBean' resolved to null: javax.el.PropertyNotFoundException: Target Unreachable, identifier 'backingBean' resolved to null 这是我的密码： index.xht

我正在重构我的代码，以使用自定义facelets标记库来“干燥”我的代码

一切正常，但当我需要参数化ajax侦听器操作时，出现了一个异常：

 Target Unreachable, identifier 'backingBean' resolved to null: javax.el.PropertyNotFoundException: Target Unreachable, identifier 'backingBean' resolved to null
这是我的密码：

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://java.sun.com/jsf/html"
    xmlns:f="http://java.sun.com/jsf/core"
    xmlns:p="http://primefaces.org/ui"
    xmlns:ui="http://java.sun.com/jsf/facelets"
    xmlns:test="http://ericsantanna.com/faceletsTest/jsf/facelets"
>
<h:head>
    <h:outputStylesheet name="tema.css" library="css" />
</h:head>
<h:body>
    <h:form id="testForm">
        <test:faceletsTest
        id="testPickList"
        values="#{controller.pickListData}"
        backingBean="${controller}"
        transferHandle="handleTranferEvent"
        />
    </h:form>

</h:body>
</html>

<ui:composition
    xmlns:c="http://java.sun.com/jsp/jstl/core"
    xmlns:f="http://java.sun.com/jsf/core"
    xmlns:h="http://java.sun.com/jsf/html"
    xmlns:ui="http://java.sun.com/jsf/facelets"
    xmlns:p="http://primefaces.org/ui">

    <p:pickList
        id="#{id}"
        value="#{values}" 
        var="s"
        itemValue="#{s}"
        itemLabel="#{s}">

        <p:ajax event="transfer" listener="#{backingBean[transferHandle]}" />
    </p:pickList>

</ui:composition>

package com.ericsantanna.faceletEventTest;

import java.util.Arrays;
import java.util.List;

import javax.annotation.PostConstruct;
import javax.faces.bean.ManagedBean;
import javax.faces.bean.RequestScoped;

import org.jboss.logging.Logger;
import org.primefaces.event.TransferEvent;
import org.primefaces.model.DualListModel;

/**
 * @author Eric Sant'Anna
 *
 */
@RequestScoped
@ManagedBean
public class Controller {

    private DualListModel<String> pickListData = new DualListModel<String>();

    @PostConstruct
    public void init() {
        pickListData.getSource().addAll(Arrays.asList("A", "B", "C"));
    }
//  Show message if uncommented:
//  public void handleTranferEvent() {
//      Logger.getLogger(getClass()).info("Sem argumentos...");
//  }

    public void handleTranferEvent(TransferEvent event) {
        Logger.getLogger(getClass()).info("Você escolheu: " + formatItems(event.getItems()));
    }

    public String formatItems(List<?> list) {
        String result = "";
        for(Object s : list) result += s;
        return result;
    }

    public DualListModel<String> getPickListData() {
        return pickListData;
    }

    public void setPickListData(DualListModel<String> pickListData) {
        this.pickListData = pickListData;
    }
}

<?xml version="1.0" encoding="UTF-8"?>
<facelet-taglib 
    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-facelettaglibrary_2_0.xsd"
    version="2.0">
    <namespace>http://ericsantanna.com/faceletsTest/jsf/facelets</namespace>
    <tag>
        <tag-name>faceletsTest</tag-name>
        <source>tags/test/faceletsTest.xhtml</source>
    </tag>
</facelet-taglib>
faceletsTest.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://java.sun.com/jsf/html"
    xmlns:f="http://java.sun.com/jsf/core"
    xmlns:p="http://primefaces.org/ui"
    xmlns:ui="http://java.sun.com/jsf/facelets"
    xmlns:test="http://ericsantanna.com/faceletsTest/jsf/facelets"
>
<h:head>
    <h:outputStylesheet name="tema.css" library="css" />
</h:head>
<h:body>
    <h:form id="testForm">
        <test:faceletsTest
        id="testPickList"
        values="#{controller.pickListData}"
        backingBean="${controller}"
        transferHandle="handleTranferEvent"
        />
    </h:form>

</h:body>
</html>

<ui:composition
    xmlns:c="http://java.sun.com/jsp/jstl/core"
    xmlns:f="http://java.sun.com/jsf/core"
    xmlns:h="http://java.sun.com/jsf/html"
    xmlns:ui="http://java.sun.com/jsf/facelets"
    xmlns:p="http://primefaces.org/ui">

    <p:pickList
        id="#{id}"
        value="#{values}" 
        var="s"
        itemValue="#{s}"
        itemLabel="#{s}">

        <p:ajax event="transfer" listener="#{backingBean[transferHandle]}" />
    </p:pickList>

</ui:composition>

package com.ericsantanna.faceletEventTest;

import java.util.Arrays;
import java.util.List;

import javax.annotation.PostConstruct;
import javax.faces.bean.ManagedBean;
import javax.faces.bean.RequestScoped;

import org.jboss.logging.Logger;
import org.primefaces.event.TransferEvent;
import org.primefaces.model.DualListModel;

/**
 * @author Eric Sant'Anna
 *
 */
@RequestScoped
@ManagedBean
public class Controller {

    private DualListModel<String> pickListData = new DualListModel<String>();

    @PostConstruct
    public void init() {
        pickListData.getSource().addAll(Arrays.asList("A", "B", "C"));
    }
//  Show message if uncommented:
//  public void handleTranferEvent() {
//      Logger.getLogger(getClass()).info("Sem argumentos...");
//  }

    public void handleTranferEvent(TransferEvent event) {
        Logger.getLogger(getClass()).info("Você escolheu: " + formatItems(event.getItems()));
    }

    public String formatItems(List<?> list) {
        String result = "";
        for(Object s : list) result += s;
        return result;
    }

    public DualListModel<String> getPickListData() {
        return pickListData;
    }

    public void setPickListData(DualListModel<String> pickListData) {
        this.pickListData = pickListData;
    }
}

<?xml version="1.0" encoding="UTF-8"?>
<facelet-taglib 
    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-facelettaglibrary_2_0.xsd"
    version="2.0">
    <namespace>http://ericsantanna.com/faceletsTest/jsf/facelets</namespace>
    <tag>
        <tag-name>faceletsTest</tag-name>
        <source>tags/test/faceletsTest.xhtml</source>
    </tag>
</facelet-taglib>
Controller.java：

<?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://java.sun.com/jsf/html"
    xmlns:f="http://java.sun.com/jsf/core"
    xmlns:p="http://primefaces.org/ui"
    xmlns:ui="http://java.sun.com/jsf/facelets"
    xmlns:test="http://ericsantanna.com/faceletsTest/jsf/facelets"
>
<h:head>
    <h:outputStylesheet name="tema.css" library="css" />
</h:head>
<h:body>
    <h:form id="testForm">
        <test:faceletsTest
        id="testPickList"
        values="#{controller.pickListData}"
        backingBean="${controller}"
        transferHandle="handleTranferEvent"
        />
    </h:form>

</h:body>
</html>

<ui:composition
    xmlns:c="http://java.sun.com/jsp/jstl/core"
    xmlns:f="http://java.sun.com/jsf/core"
    xmlns:h="http://java.sun.com/jsf/html"
    xmlns:ui="http://java.sun.com/jsf/facelets"
    xmlns:p="http://primefaces.org/ui">

    <p:pickList
        id="#{id}"
        value="#{values}" 
        var="s"
        itemValue="#{s}"
        itemLabel="#{s}">

        <p:ajax event="transfer" listener="#{backingBean[transferHandle]}" />
    </p:pickList>

</ui:composition>

package com.ericsantanna.faceletEventTest;

import java.util.Arrays;
import java.util.List;

import javax.annotation.PostConstruct;
import javax.faces.bean.ManagedBean;
import javax.faces.bean.RequestScoped;

import org.jboss.logging.Logger;
import org.primefaces.event.TransferEvent;
import org.primefaces.model.DualListModel;

/**
 * @author Eric Sant'Anna
 *
 */
@RequestScoped
@ManagedBean
public class Controller {

    private DualListModel<String> pickListData = new DualListModel<String>();

    @PostConstruct
    public void init() {
        pickListData.getSource().addAll(Arrays.asList("A", "B", "C"));
    }
//  Show message if uncommented:
//  public void handleTranferEvent() {
//      Logger.getLogger(getClass()).info("Sem argumentos...");
//  }

    public void handleTranferEvent(TransferEvent event) {
        Logger.getLogger(getClass()).info("Você escolheu: " + formatItems(event.getItems()));
    }

    public String formatItems(List<?> list) {
        String result = "";
        for(Object s : list) result += s;
        return result;
    }

    public DualListModel<String> getPickListData() {
        return pickListData;
    }

    public void setPickListData(DualListModel<String> pickListData) {
        this.pickListData = pickListData;
    }
}

<?xml version="1.0" encoding="UTF-8"?>
<facelet-taglib 
    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-facelettaglibrary_2_0.xsd"
    version="2.0">
    <namespace>http://ericsantanna.com/faceletsTest/jsf/facelets</namespace>
    <tag>
        <tag-name>faceletsTest</tag-name>
        <source>tags/test/faceletsTest.xhtml</source>
    </tag>
</facelet-taglib>

package com.ericsantana.faceleteventest；
导入java.util.array；
导入java.util.List；
导入javax.annotation.PostConstruct；
导入javax.faces.bean.ManagedBean；
导入javax.faces.bean.RequestScope；
导入org.jboss.logging.Logger；
导入org.primefaces.event.transfervent；
导入org.primefaces.model.DualListModel；
/**
*@作者埃里克·桑塔纳
*
*/
@请求范围
@ManagedBean
公共类控制器{
私有DualListModel pickListData=新的DualListModel（）；
@施工后
公共void init（）{
pickListData.getSource（）.addAll（Arrays.asList（“A”、“B”、“C”））；
}
//如果未注释，则显示消息：
//公共无效handleTranferEvent（）{
//getLogger.getLogger（getClass（））.info（“Sem arguments…”）；
//  }
公共无效handleTranferEvent（TransferEvent事件）{
getLogger.getLogger（getClass（））.info（“Vocêescolheu:+formatItems（event.getItems（）））；
}
公共字符串格式项（列表）{
字符串结果=”；
对于（对象s：列表）结果+=s；
返回结果；
}
public DualListModel getPickListData（）{
返回pickListData；
}
public void setPickListData（DualListModel pickListData）{
this.pickListData=pickListData；
}
}
faceletsTest.taglib.xml：

<?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://java.sun.com/jsf/html"
    xmlns:f="http://java.sun.com/jsf/core"
    xmlns:p="http://primefaces.org/ui"
    xmlns:ui="http://java.sun.com/jsf/facelets"
    xmlns:test="http://ericsantanna.com/faceletsTest/jsf/facelets"
>
<h:head>
    <h:outputStylesheet name="tema.css" library="css" />
</h:head>
<h:body>
    <h:form id="testForm">
        <test:faceletsTest
        id="testPickList"
        values="#{controller.pickListData}"
        backingBean="${controller}"
        transferHandle="handleTranferEvent"
        />
    </h:form>

</h:body>
</html>

<ui:composition
    xmlns:c="http://java.sun.com/jsp/jstl/core"
    xmlns:f="http://java.sun.com/jsf/core"
    xmlns:h="http://java.sun.com/jsf/html"
    xmlns:ui="http://java.sun.com/jsf/facelets"
    xmlns:p="http://primefaces.org/ui">

    <p:pickList
        id="#{id}"
        value="#{values}" 
        var="s"
        itemValue="#{s}"
        itemLabel="#{s}">

        <p:ajax event="transfer" listener="#{backingBean[transferHandle]}" />
    </p:pickList>

</ui:composition>

package com.ericsantanna.faceletEventTest;

import java.util.Arrays;
import java.util.List;

import javax.annotation.PostConstruct;
import javax.faces.bean.ManagedBean;
import javax.faces.bean.RequestScoped;

import org.jboss.logging.Logger;
import org.primefaces.event.TransferEvent;
import org.primefaces.model.DualListModel;

/**
 * @author Eric Sant'Anna
 *
 */
@RequestScoped
@ManagedBean
public class Controller {

    private DualListModel<String> pickListData = new DualListModel<String>();

    @PostConstruct
    public void init() {
        pickListData.getSource().addAll(Arrays.asList("A", "B", "C"));
    }
//  Show message if uncommented:
//  public void handleTranferEvent() {
//      Logger.getLogger(getClass()).info("Sem argumentos...");
//  }

    public void handleTranferEvent(TransferEvent event) {
        Logger.getLogger(getClass()).info("Você escolheu: " + formatItems(event.getItems()));
    }

    public String formatItems(List<?> list) {
        String result = "";
        for(Object s : list) result += s;
        return result;
    }

    public DualListModel<String> getPickListData() {
        return pickListData;
    }

    public void setPickListData(DualListModel<String> pickListData) {
        this.pickListData = pickListData;
    }
}

<?xml version="1.0" encoding="UTF-8"?>
<facelet-taglib 
    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-facelettaglibrary_2_0.xsd"
    version="2.0">
    <namespace>http://ericsantanna.com/faceletsTest/jsf/facelets</namespace>
    <tag>
        <tag-name>faceletsTest</tag-name>
        <source>tags/test/faceletsTest.xhtml</source>
    </tag>
</facelet-taglib>


http://ericsantanna.com/faceletsTest/jsf/facelets
Facelestest
tags/test/faceletsTest.xhtml
为什么p:ajax没有将transfervent添加到操作中？
如何解决这个问题？

这个问题的原因与这里已经回答的相同@BalusC谢谢，这解决了我的问题。Omnifaces真的很方便！