Jboss Error picklist render using showcase

问题

related links: PrimeFaces PickList with OmniFaces validateAll leads to NullPointerException

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

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)

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.

enviroment

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

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;
    }

}

converter

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));
    }
}

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);

issue of primefaces

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

the both question is related because in sme point in the other question they can achieve to resolve the problem but Im following all stuffs they made, but I cant figure out, yeah both questions are similar , them have somo little differets but for me is the same scenary

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

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

回答1:

problems

-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}"

to this

value="#{compositeComponent.cities}"

-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.

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>

来源：https://stackoverflow.com/questions/59526324/jboss-error-picklist-render-using-showcase

标签

jsf

primefaces

jboss-eap-7

picklist