An error occurred while performing resource injection in the managed parent bean

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Attempting to start a system page shows this error.

I'll put the codes:

DAO 

package br.com.netsoft.desif.dao.endereco;

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

import javax.persistence.EntityManager;
import javax.persistence.Query;

import br.com.netsoft.desif.model.endereco.PaisEntity;

public class PaisDao implements Serializable {

    private static final long serialVersionUID = 1402488530698938353L;

    final private String hql = " p FROM PaisEntity p ";

    EntityManager em;

    public List<PaisEntity> listarPaises() {

        StringBuilder hqlSelect = new StringBuilder(hql);

        final String query = "SELECT " + hqlSelect;

        Query querySelect = em.createQuery(query);

        @SuppressWarnings("unchecked")
        List<PaisEntity> resultList = querySelect.getResultList();

        return resultList;

    }

}

ENTITY 

package br.com.netsoft.desif.model.endereco;

import java.io.Serializable;

import javax.persistence.Column;
import javax.persistence.GeneratedValue;
import javax.persistence.GenerationType;
import javax.persistence.Id;
import javax.persistence.SequenceGenerator;

public class PaisEntity implements Serializable {

    private static final long serialVersionUID = 7784827196506672790L;
    private Long id;
    private String descricao;

    @Id
    @Column(name = "pai_id")
    @SequenceGenerator(name = "enderecos.end_pais_pai_id_seq", sequenceName = "enderecos.end_pais_pai_id_seq", allocationSize = 1)
    @GeneratedValue(generator = "enderecos.end_pais_pai_id_seq", strategy = GenerationType.SEQUENCE)
    public Long getId() {
        return id;
    }

    public void setId(Long id) {
        this.id = id;
    }

    @Column(name = "pai_descricao")
    public String getDescricao() {
        return descricao;
    }

    public void setDescricao(String descricao) {
        this.descricao = descricao;
    }

}

CONTROLLER 

package br.com.netsoft.desif.controler.endereco;

import java.util.ArrayList;
import java.util.Iterator;
import java.util.List;

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

import br.com.netsoft.desif.dao.endereco.PaisDao;
import br.com.netsoft.desif.model.endereco.PaisEntity;

@ManagedBean(name = "paisControler")
@RequestScoped
public class PaisControler extends PaisEntity {

    private static final long serialVersionUID = -8396738159447021720L;

    private List<PaisEntity> paises;

    private PaisDao paisDao;

    public List<PaisEntity> getPaises() {
        if (paises == null) {
            return new ArrayList<PaisEntity>();
        }
        return paises;
    }

    public void setPaises(List<PaisEntity> paises) {
        this.paises = paises;
    }

    @PostConstruct
    public void init() {
        System.out.println("Página inicial de países.");
        @SuppressWarnings("unused")
        List<PaisEntity> paisesBusca = paisDao.listarPaises();

        ArrayList<PaisEntity> paises = (ArrayList<PaisEntity>) paisDao.listarPaises();

        for (Iterator<?> iterator = paises.iterator(); iterator.hasNext();) {
            PaisEntity pais = (PaisEntity) iterator.next();
            pais.setId(pais.getId());
            pais.setDescricao(pais.getDescricao());
            paises.add(pais);
        }

        this.setPaises(paises);
    }

    public String getMensagem() {
        return "Teste";
    }

}

VISION 

 <!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:ui="http://java.sun.com/jsf/facelets"
        xmlns:f="http://java.sun.com/jsf/core"
        xmlns:h="http://java.sun.com/jsf/html">

    <h:head>
        <title>Hello JSF!</title>
    </h:head>
    <h:body>
          #{paisControler.mensagem}

        <h:dataTable var="pais" value="#{paisControler.paises}">

            <h:column headerText="Id">
                <h:outputText value="#{pais.id}" />
            </h:column>

            <h:column headerText="Year">
                <h:outputText value="#{pais.descricao}" />
            </h:column>

        </h:dataTable>

    </h:body>

    </html>

Error: 

mar 21, 2017 8:08:40 AM com.sun.faces.application.view.FaceletViewHandlingStrategy handleRenderException
GRAVE: Error Rendering View[/public/index.xhtml]
javax.el.ELException: /public/index.xhtml: Um erro ocorreu ao realizar a injeção de recurso no bean gerenciado paisControler
    at com.sun.faces.facelets.compiler.TextInstruction.write(TextInstruction.java:90)
    at com.sun.faces.facelets.compiler.UIInstructions.encodeBegin(UIInstructions.java:82)
    at com.sun.faces.facelets.compiler.UILeaf.encodeAll(UILeaf.java:183)
    at javax.faces.component.UIComponent.encodeAll(UIComponent.java:1859)
    at javax.faces.component.UIComponent.encodeAll(UIComponent.java:1859)
    at com.sun.faces.application.view.FaceletViewHandlingStrategy.renderView(FaceletViewHandlingStrategy.java:443)
    at com.sun.faces.application.view.MultiViewHandler.renderView(MultiViewHandler.java:131)
    at javax.faces.application.ViewHandlerWrapper.renderView(ViewHandlerWrapper.java:337)
    at com.sun.faces.lifecycle.RenderResponsePhase.execute(RenderResponsePhase.java:120)
    at com.sun.faces.lifecycle.Phase.doPhase(Phase.java:101)
    at com.sun.faces.lifecycle.LifecycleImpl.render(LifecycleImpl.java:219)
    at javax.faces.webapp.FacesServlet.service(FacesServlet.java:647)
    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:230)
    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:165)
    at org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52)
    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:192)
    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:165)
    at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:198)
    at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:96)
    at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:478)
    at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:140)
    at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:80)
    at org.apache.catalina.valves.AbstractAccessLogValve.invoke(AbstractAccessLogValve.java:624)
    at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:87)
    at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:341)
    at org.apache.coyote.http11.Http11Processor.service(Http11Processor.java:783)
    at org.apache.coyote.AbstractProcessorLight.process(AbstractProcessorLight.java:66)
    at org.apache.coyote.AbstractProtocol$ConnectionHandler.process(AbstractProtocol.java:798)
    at org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.doRun(NioEndpoint.java:1441)
    at org.apache.tomcat.util.net.SocketProcessorBase.run(SocketProcessorBase.java:49)
    at java.util.concurrent.ThreadPoolExecutor.runWorker(Unknown Source)
    at java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source)
    at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61)
    at java.lang.Thread.run(Unknown Source)
Caused by: com.sun.faces.mgbean.ManagedBeanCreationException: Um erro ocorreu ao realizar a injeção de recurso no bean gerenciado paisControler
    at com.sun.faces.mgbean.BeanBuilder.invokePostConstruct(BeanBuilder.java:227)
    at com.sun.faces.mgbean.BeanBuilder.build(BeanBuilder.java:103)
    at com.sun.faces.mgbean.BeanManager.createAndPush(BeanManager.java:409)
    at com.sun.faces.mgbean.BeanManager.create(BeanManager.java:269)
    at com.sun.faces.el.ManagedBeanELResolver.resolveBean(ManagedBeanELResolver.java:244)
    at com.sun.faces.el.ManagedBeanELResolver.getValue(ManagedBeanELResolver.java:116)
    at com.sun.faces.el.DemuxCompositeELResolver._getValue(DemuxCompositeELResolver.java:176)
    at com.sun.faces.el.DemuxCompositeELResolver.getValue(DemuxCompositeELResolver.java:203)
    at org.apache.el.parser.AstIdentifier.getValue(AstIdentifier.java:94)
    at org.apache.el.parser.AstValue.getValue(AstValue.java:137)
    at org.apache.el.ValueExpressionImpl.getValue(ValueExpressionImpl.java:184)
    at org.jboss.weld.el.WeldValueExpression.getValue(WeldValueExpression.java:50)
    at com.sun.faces.facelets.el.ELText$ELTextVariable.writeText(ELText.java:227)
    at com.sun.faces.facelets.el.ELText$ELTextComposite.writeText(ELText.java:150)
    at com.sun.faces.facelets.compiler.TextInstruction.write(TextInstruction.java:85)
    ... 33 more
Caused by: com.sun.faces.spi.InjectionProviderException
    at com.sun.faces.vendor.WebContainerInjectionProvider.invokeAnnotatedMethod(WebContainerInjectionProvider.java:115)
    at com.sun.faces.vendor.WebContainerInjectionProvider.invokePostConstruct(WebContainerInjectionProvider.java:95)
    at com.sun.faces.mgbean.BeanBuilder.invokePostConstruct(BeanBuilder.java:221)
    ... 47 more
Caused by: java.lang.reflect.InvocationTargetException
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
    at java.lang.reflect.Method.invoke(Unknown Source)
    at com.sun.faces.vendor.WebContainerInjectionProvider.invokeAnnotatedMethod(WebContainerInjectionProvider.java:113)
    ... 49 more
Caused by: java.lang.NullPointerException
    at br.com.netsoft.desif.controler.endereco.PaisControler.init(PaisControler.java:39)
    ... 54 more

mar 21, 2017 8:08:40 AM org.apache.catalina.core.StandardWrapperValve invoke
GRAVE: Servlet.service() for servlet [Faces Servlet] in context with path [/desif] threw exception [Um erro ocorreu ao realizar a injeção de recurso no bean gerenciado paisControler] with root cause
java.lang.NullPointerException
    at br.com.netsoft.desif.controler.endereco.PaisControler.init(PaisControler.java:39)
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
    at java.lang.reflect.Method.invoke(Unknown Source)
    at com.sun.faces.vendor.WebContainerInjectionProvider.invokeAnnotatedMethod(WebContainerInjectionProvider.java:113)
    at com.sun.faces.vendor.WebContainerInjectionProvider.invokePostConstruct(WebContainerInjectionProvider.java:95)
    at com.sun.faces.mgbean.BeanBuilder.invokePostConstruct(BeanBuilder.java:221)
    at com.sun.faces.mgbean.BeanBuilder.build(BeanBuilder.java:103)
    at com.sun.faces.mgbean.BeanManager.createAndPush(BeanManager.java:409)
    at com.sun.faces.mgbean.BeanManager.create(BeanManager.java:269)
    at com.sun.faces.el.ManagedBeanELResolver.resolveBean(ManagedBeanELResolver.java:244)
    at com.sun.faces.el.ManagedBeanELResolver.getValue(ManagedBeanELResolver.java:116)
    at com.sun.faces.el.DemuxCompositeELResolver._getValue(DemuxCompositeELResolver.java:176)
    at com.sun.faces.el.DemuxCompositeELResolver.getValue(DemuxCompositeELResolver.java:203)
    at org.apache.el.parser.AstIdentifier.getValue(AstIdentifier.java:94)
    at org.apache.el.parser.AstValue.getValue(AstValue.java:137)
    at org.apache.el.ValueExpressionImpl.getValue(ValueExpressionImpl.java:184)
    at org.jboss.weld.el.WeldValueExpression.getValue(WeldValueExpression.java:50)
    at com.sun.faces.facelets.el.ELText$ELTextVariable.writeText(ELText.java:227)
    at com.sun.faces.facelets.el.ELText$ELTextComposite.writeText(ELText.java:150)
    at com.sun.faces.facelets.compiler.TextInstruction.write(TextInstruction.java:85)
    at com.sun.faces.facelets.compiler.UIInstructions.encodeBegin(UIInstructions.java:82)
    at com.sun.faces.facelets.compiler.UILeaf.encodeAll(UILeaf.java:183)
    at javax.faces.component.UIComponent.encodeAll(UIComponent.java:1859)
    at javax.faces.component.UIComponent.encodeAll(UIComponent.java:1859)
    at com.sun.faces.application.view.FaceletViewHandlingStrategy.renderView(FaceletViewHandlingStrategy.java:443)
    at com.sun.faces.application.view.MultiViewHandler.renderView(MultiViewHandler.java:131)
    at javax.faces.application.ViewHandlerWrapper.renderView(ViewHandlerWrapper.java:337)
    at com.sun.faces.lifecycle.RenderResponsePhase.execute(RenderResponsePhase.java:120)
    at com.sun.faces.lifecycle.Phase.doPhase(Phase.java:101)
    at com.sun.faces.lifecycle.LifecycleImpl.render(LifecycleImpl.java:219)
    at javax.faces.webapp.FacesServlet.service(FacesServlet.java:647)
    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:230)
    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:165)
    at org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52)
    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:192)
    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:165)
    at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:198)
    at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:96)
    at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:478)
    at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:140)
    at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:80)
    at org.apache.catalina.valves.AbstractAccessLogValve.invoke(AbstractAccessLogValve.java:624)
    at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:87)
    at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:341)
    at org.apache.coyote.http11.Http11Processor.service(Http11Processor.java:783)
    at org.apache.coyote.AbstractProcessorLight.process(AbstractProcessorLight.java:66)
    at org.apache.coyote.AbstractProtocol$ConnectionHandler.process(AbstractProtocol.java:798)
    at org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.doRun(NioEndpoint.java:1441)
    at org.apache.tomcat.util.net.SocketProcessorBase.run(SocketProcessorBase.java:49)
    at java.util.concurrent.ThreadPoolExecutor.runWorker(Unknown Source)
    at java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source)
    at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61)
    at java.lang.Thread.run(Unknown Source)
    
asked by anonymous 21.03.2017 / 12:09

1 answer

0

The log is already pointing to the error: 

java.lang.NullPointerException
 at br.com.netsoft.desif.controler.endereco.PaisControler.init(PaisControler.java:39)

This NPE occurs in the following code snippet: 

List<PaisEntity> paisesBusca = paisDao.listarPaises();

The problem is because you did not inject the paisDao, so it is null here and so the call of your listarPaises method causes NPE. Add the injection of this attribute in the MBean and the problem will be solved.

    
21.03.2017 / 14:21
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