使用展示柜呈现Jboss错误选择列表 [英] Jboss Error picklist render using showcase

问题描述

相关链接: PrimeFaces PickList使用OmniFaces validateAll会导致NullPointerException

此问题与该链接相似，因为当我调试picklistRender时，我得到了以前在链接中显示的相同错误，具有相同的症状，但是我正在阅读所有问题

this problem is similar with this link becuase when I do the debug of the picklistRender I got the same error showed in the link before,the same syntoms, but I am reading all issue history related, Thomas Andraschko sugguest is a problem of mojarra but I tried to test with myfaces-version-22 and myfaces-version-23 and I face the same problem

我试图找出解决我的示例工作的方法，例如展示橱窗p:picklist，但文档说的却不尽如人意，我尝试了

Im trying to figure out to resolve my example works like showcase p:picklist but not worls as well said the docs, I tried several options like

 - don't use mojarra,use myfaces
 - change primefaces version 7.0 to 8.0.RC1
 - put a custom converter
 -jboss-deployment-structure.xml (disables packages from jboss)

何时发生错误? -载入页面 为什么要使用转换器? -是我尝试解决此问题的一种选择，但是，之前我们提出了使用建议，无论是否使用转换器，我都会进行测试，并且会发生相同的错误.

When does the error occur? - loading page why am I using a converter? - is an option I tried to fix the problem, but, the ussue raises before, I test with or withoutconverter and happens the same error.

环境

-Jboos EAP 7.2 
- repo https://github.com/Qleoz12/Primefaces-Mydemo

但是我总是遇到这个错误

but always I have this error

java.lang.NullPointerException

viewId=/components/usingCompositeComponent.xhtml
location=I:\developer\Fado\Servidores\jboss-eap-7.2\standalone\deployments\Primefaces-        
Mydemo.war\components\usingCompositeComponent.xhtml
phaseId=RENDER_RESPONSE(6)

Caused by:
java.lang.NullPointerException
at org.primefaces.component.picklist.PickListRenderer.encodeMarkup(PickListRenderer.java:103)

xhtml

<?xml version='1.0' encoding='UTF-8' ?>
<!DOCTYPE composition PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<ui:composition xmlns="http://www.w3.org/1999/xhtml"
    xmlns:ui="http://java.sun.com/jsf/facelets"
    xmlns:h="http://java.sun.com/jsf/html"
    xmlns:f="http://java.sun.com/jsf/core"
    xmlns:p="http://primefaces.org/ui"
    xmlns:c="http://java.sun.com/jsp/jstl/core"
    xmlns:ccp="http://java.sun.com/jsf/composite/cc"
    template="../template/ui.xhtml">
    <ui:define name="body">
        <p:pickList 
            id="FF"
            value="#{CompositeComponent.cities}" 
            var="cities"
            itemLabel="#{cities}"
            itemValue="#{cities}"
            converter="PickListConverter"
        >
        </p:pickList>
    </ui:define>
</ui:composition>

bean

package Beans;

import java.io.Serializable;
import java.util.ArrayList;
import java.util.List;

import javax.annotation.PostConstruct;
import javax.inject.Named;

import org.primefaces.model.DualListModel;

@Named
@javax.faces.view.ViewScoped
public class CompositeComponent implements Serializable {

    /**
     * 
     */
    private static final long serialVersionUID = 1L;
    private static final org.slf4j.Logger logger = org.slf4j.LoggerFactory.getLogger(CompositeComponent.class);
    private DualListModel<String> cities;
    List<String> citiesSource = new ArrayList<String>();
    List<String> citiesTarget = new ArrayList<String>();

    public CompositeComponent() {
        super();
    }

    @PostConstruct
    public void init() {
        // Cities
        citiesSource.add("San Francisco");
        citiesSource.add("London");
        citiesSource.add("Paris");
        citiesSource.add("Istanbul");
        citiesSource.add("Berlin");
        citiesSource.add("Barcelona");
        citiesSource.add("Rome");

        cities = new DualListModel<String>(citiesSource, citiesTarget);
    }

    public DualListModel<String> getCities() {
        return cities;
    }

    public void setCities(DualListModel<String> cities) {
        this.cities = cities;
    }

}

转换器

package converter;

import javax.faces.component.UIComponent;
import javax.faces.context.FacesContext;
import javax.faces.convert.Converter;
import javax.faces.convert.FacesConverter;

import org.primefaces.component.picklist.PickList;
import org.primefaces.model.DualListModel;


@SuppressWarnings({"unused", "rawtypes"})
@FacesConverter("PickListConverter")
public class PickListConverter implements Converter{

    public Object getAsObject(FacesContext facesContext, UIComponent component, String submittedValue) {
        PickList  p = (PickList) component;
        DualListModel dl = (DualListModel) p.getValue();
        return dl.getSource().get(Integer.valueOf(submittedValue));
    }

    public String getAsString(FacesContext facesContext, UIComponent component, Object value) {
        PickList  p = (PickList) component;
        DualListModel dl = (DualListModel) p.getValue();
        return  String.valueOf(dl.getSource().indexOf(value));
    }
}

---

1. 问题 对于PickListRenderer，NPE在第78行，然后在PickListRenderer内部为128:

1. question And for the PickListRenderer the NPE is in line 78 then 128 inside PickListRenderer:

encodeList(context, pickList, clientId + "_target", PickList.TARGET_CLASS, model.getTarget(),
        pickList.getFacet("targetCaption"), pickList.isShowTargetFilter(), false); 

primefaces

与模型相关的NPE变量在encodeMarkup中始终为null，之后使用该模型为null调用encodeList.

the NPE var is related with model always is null inside encodeMarkup that afterward call encodeList with this model null.

DualListModel model = getModelValueToRender(context, pickList);

stackTrace https://pastebin.com/wLKZWReg

stackTrace https://pastebin.com/wLKZWReg

1. 这两个问题是相关的，因为在另一个问题上，他们可以解决该问题，但是我跟踪他们提出的所有内容，但是我无法弄清楚，是的，两个问题都是相似的，它们之间的差异很小，但对于我是同一个场景

---

7:如果与mojarra不相关，请删除mojarra标签. 8:在JSF开发模式下运行jsf应用程序.

---

7: If it is not mojarra related, please remove the mojarra tag. 8: Run you jsf application in JSF development mode.

是的，我尝试通过mojarra解决此错误测试或测试myfaces，因为我没有删除mojarra的标签.

yes I trying to resolve this error testing with mojarra or testing myfaces for that I dont remove the tag of mojarra.

推荐答案

问题

-在xhtml上固定Bean的名称Bean的名称通常以小写字母开头(对于我来说，是

-Fix on the xhtml the name of the bean the name of the bean usually starts with lowercase for that I chabge

value="#{CompositeComponent.cities}"

对此

value="#{compositeComponent.cities}"

-对于字符串，删除转换器，但是对于自定义对象，您必须编写转换器的自己的实现，我在

-for Strings remove the converter , but for custom objects you must to write a own implemantation of the converter, I put an example into my repo in github.

我测试了两种处理JSF置换的方法，而另一种则填充了项目 您必须选择一个，不要同时使用两者，否则在部署阶段会出现一些错误.

I test two ways to handle JSF anottation and anothers stuff the project you must choose one, dont use both or you have some error on deploying stage.

        <!-- javax.* APIs -->
    <!-- old way -->
    <dependency>
    <groupId>javax</groupId>
    <artifactId>javaee-web-api</artifactId>
    <version>8.0</version>
    <scope>provided</scope>
    </dependency>
    <!-- end old way -->
    <!-- new way -->
    <dependency>
        <groupId>org.apache.geronimo.specs</groupId>
        <artifactId>geronimo-atinject_1.0_spec</artifactId>
        <version>1.0</version>
    </dependency>
    <dependency>
        <groupId>org.apache.geronimo.specs</groupId>
        <artifactId>geronimo-jcdi_2.0_spec</artifactId>
        <version>1.0.1</version>
    </dependency>
    <dependency>
        <groupId>org.apache.geronimo.specs</groupId>
        <artifactId>geronimo-interceptor_1.2_spec</artifactId>
        <version>1.0</version>
    </dependency>
    <dependency>
        <groupId>org.apache.geronimo.specs</groupId>
        <artifactId>geronimo-annotation_1.3_spec</artifactId>
        <version>1.0</version>
    </dependency>

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