Exception "java.lang.NullPointerException"

**lamia89** · 09/05/2012, 17h20

Bonjour,

Je suis entrain de développez une application en JEE sous Hibernate , Spring , JSF primefaces mais lors de l’exécution j'obtient l’exception suivante:

Code :

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GRAVE: "Servlet.service()" pour la servlet jsp a lancé une exception
java.lang.NullPointerException
	at ma.it.bean.NewsBean.init(NewsBean.java:25)
	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 org.springframework.beans.factory.annotation.InitDestroyAnnotationBeanPostProcessor$LifecycleElement.invoke(InitDestroyAnnotationBeanPostProcessor.java:297)
	at org.springframework.beans.factory.annotation.InitDestroyAnnotationBeanPostProcessor$LifecycleMetadata.invokeInitMethods(InitDestroyAnnotationBeanPostProcessor.java:250)
	at org.springframework.beans.factory.annotation.InitDestroyAnnotationBeanPostProcessor.postProcessBeforeInitialization(InitDestroyAnnotationBeanPostProcessor.java:144)
	at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.applyBeanPostProcessorsBeforeInitialization(AbstractAutowireCapableBeanFactory.java:350)
	at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.initializeBean(AbstractAutowireCapableBeanFactory.java:1329)
	at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:471)
	at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory$1.run(AbstractAutowireCapableBeanFactory.java:409)
	at java.security.AccessController.doPrivileged(Native Method)
	at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:380)
	at org.springframework.beans.factory.support.AbstractBeanFactory$2.getObject(AbstractBeanFactory.java:302)
	at org.springframework.web.context.request.AbstractRequestAttributesScope.get(AbstractRequestAttributesScope.java:43)
	at org.springframework.web.context.request.SessionScope.get(SessionScope.java:90)
	at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:298)
	at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:185)
	at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:164)
	at org.springframework.context.support.AbstractApplicationContext.getBean(AbstractApplicationContext.java:881)
	at org.springframework.beans.factory.access.el.SpringBeanELResolver.getValue(SpringBeanELResolver.java:58)
	at javax.el.CompositeELResolver.getValue(CompositeELResolver.java:54)
	at com.sun.faces.el.FacesCompositeELResolver.getValue(FacesCompositeELResolver.java:58)
	at org.apache.el.parser.AstIdentifier.getValue(AstIdentifier.java:69)
	at org.apache.el.parser.AstValue.getValue(AstValue.java:112)
	at org.apache.el.ValueExpressionImpl.getValue(ValueExpressionImpl.java:186)
	at org.apache.jasper.el.JspValueExpression.getValue(JspValueExpression.java:101)
	at com.sun.faces.application.ApplicationImpl.createComponent(ApplicationImpl.java:198)
	at javax.faces.webapp.UIComponentELTag.createComponent(UIComponentELTag.java:215)
	at javax.faces.webapp.UIComponentClassicTagBase.createChild(UIComponentClassicTagBase.java:454)
	at javax.faces.webapp.UIComponentClassicTagBase.findComponent(UIComponentClassicTagBase.java:635)
	at javax.faces.webapp.UIComponentClassicTagBase.doStartTag(UIComponentClassicTagBase.java:1033)
	at org.apache.jsp.Views.News_jsp._jspx_meth_p_005fdataTable_005f0(News_jsp.java:210)
	at org.apache.jsp.Views.News_jsp._jspx_meth_h_005fform_005f0(News_jsp.java:170)
	at org.apache.jsp.Views.News_jsp._jspx_meth_f_005fview_005f0(News_jsp.java:125)
	at org.apache.jsp.Views.News_jsp._jspService(News_jsp.java:88)
	at org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:70)
	at javax.servlet.http.HttpServlet.service(HttpServlet.java:717)
	at org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:388)
	at org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:313)
	at org.apache.jasper.servlet.JspServlet.service(JspServlet.java:260)
	at javax.servlet.http.HttpServlet.service(HttpServlet.java:717)
	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:290)
	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
	at org.apache.catalina.core.ApplicationDispatcher.invoke(ApplicationDispatcher.java:646)
	at org.apache.catalina.core.ApplicationDispatcher.processRequest(ApplicationDispatcher.java:436)
	at org.apache.catalina.core.ApplicationDispatcher.doForward(ApplicationDispatcher.java:374)
	at org.apache.catalina.core.ApplicationDispatcher.forward(ApplicationDispatcher.java:302)
	at com.sun.faces.context.ExternalContextImpl.dispatch(ExternalContextImpl.java:414)
	at com.sun.faces.application.ViewHandlerImpl.executePageToBuildView(ViewHandlerImpl.java:455)
	at com.sun.faces.application.ViewHandlerImpl.renderView(ViewHandlerImpl.java:139)
	at com.sun.faces.lifecycle.RenderResponsePhase.execute(RenderResponsePhase.java:108)
	at com.sun.faces.lifecycle.LifecycleImpl.phase(LifecycleImpl.java:266)
	at com.sun.faces.lifecycle.LifecycleImpl.render(LifecycleImpl.java:159)
	at javax.faces.webapp.FacesServlet.service(FacesServlet.java:245)
	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:290)
	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
	at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:233)
	at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:191)
	at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:127)
	at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:102)
	at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:109)
	at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:293)
	at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:859)
	at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(Http11Protocol.java:602)
	at org.apache.tomcat.util.net.JIoEndpoint$Worker.run(JIoEndpoint.java:489)
	at java.lang.Thread.run(Unknown Source)
9 mai 2012 16:17:00 com.sun.faces.lifecycle.LifecycleImpl phase
ATTENTION: executePhase(RENDER_RESPONSE 6,com.sun.faces.context.FacesContextImpl@1bef4c6) threw exception
javax.faces.FacesException: org.apache.jasper.JasperException: An exception occurred processing JSP page /Views/News.jsp at line 15
 
12: <body>
13: 	<f:view>
14: 		<h:form prependId="false">
15: 			<p:dataTable id="basic" var="News" binding="#{NewsBean.newsTable}"
16: 				value="#{NewsBean.newsList}">
17: 				<p:column id="modelHeader">
18: 					<f:facet name="idNews">  
 
 
Stacktrace:
	at com.sun.faces.context.ExternalContextImpl.dispatch(ExternalContextImpl.java:419)
	at com.sun.faces.application.ViewHandlerImpl.executePageToBuildView(ViewHandlerImpl.java:455)
	at com.sun.faces.application.ViewHandlerImpl.renderView(ViewHandlerImpl.java:139)
	at com.sun.faces.lifecycle.RenderResponsePhase.execute(RenderResponsePhase.java:108)
	at com.sun.faces.lifecycle.LifecycleImpl.phase(LifecycleImpl.java:266)
	at com.sun.faces.lifecycle.LifecycleImpl.render(LifecycleImpl.java:159)
	at javax.faces.webapp.FacesServlet.service(FacesServlet.java:245)
	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:290)
	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
	at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:233)
	at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:191)
	at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:127)
	at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:102)
	at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:109)
	at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:293)
	at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:859)
	at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(Http11Protocol.java:602)
	at org.apache.tomcat.util.net.JIoEndpoint$Worker.run(JIoEndpoint.java:489)
	at java.lang.Thread.run(Unknown Source)
Caused by: org.apache.jasper.JasperException: An exception occurred processing JSP page /Views/News.jsp at line 15
 
12: <body>
13: 	<f:view>
14: 		<h:form prependId="false">
15: 			<p:dataTable id="basic" var="News" binding="#{NewsBean.newsTable}"
16: 				value="#{NewsBean.newsList}">
17: 				<p:column id="modelHeader">
18: 					<f:facet name="idNews">  
 
 
Stacktrace:
	at org.apache.jasper.servlet.JspServletWrapper.handleJspException(JspServletWrapper.java:521)
	at org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:430)
	at org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:313)
	at org.apache.jasper.servlet.JspServlet.service(JspServlet.java:260)
	at javax.servlet.http.HttpServlet.service(HttpServlet.java:717)
	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:290)
	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
	at org.apache.catalina.core.ApplicationDispatcher.invoke(ApplicationDispatcher.java:646)
	at org.apache.catalina.core.ApplicationDispatcher.processRequest(ApplicationDispatcher.java:436)
	at org.apache.catalina.core.ApplicationDispatcher.doForward(ApplicationDispatcher.java:374)
	at org.apache.catalina.core.ApplicationDispatcher.forward(ApplicationDispatcher.java:302)
	at com.sun.faces.context.ExternalContextImpl.dispatch(ExternalContextImpl.java:414)
	... 18 more
Caused by: javax.faces.FacesException: org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'NewsBean': Invocation of init method failed; nested exception is java.lang.NullPointerException
	at com.sun.faces.application.ApplicationImpl.createComponent(ApplicationImpl.java:209)
	at javax.faces.webapp.UIComponentELTag.createComponent(UIComponentELTag.java:215)
	at javax.faces.webapp.UIComponentClassicTagBase.createChild(UIComponentClassicTagBase.java:454)
	at javax.faces.webapp.UIComponentClassicTagBase.findComponent(UIComponentClassicTagBase.java:635)
	at javax.faces.webapp.UIComponentClassicTagBase.doStartTag(UIComponentClassicTagBase.java:1033)
	at org.apache.jsp.Views.News_jsp._jspx_meth_p_005fdataTable_005f0(News_jsp.java:210)
	at org.apache.jsp.Views.News_jsp._jspx_meth_h_005fform_005f0(News_jsp.java:170)
	at org.apache.jsp.Views.News_jsp._jspx_meth_f_005fview_005f0(News_jsp.java:125)
	at org.apache.jsp.Views.News_jsp._jspService(News_jsp.java:88)
	at org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:70)
	at javax.servlet.http.HttpServlet.service(HttpServlet.java:717)
	at org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:388)
	... 28 more
Caused by: org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'NewsBean': Invocation of init method failed; nested exception is java.lang.NullPointerException
	at org.springframework.beans.factory.annotation.InitDestroyAnnotationBeanPostProcessor.postProcessBeforeInitialization(InitDestroyAnnotationBeanPostProcessor.java:147)
	at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.applyBeanPostProcessorsBeforeInitialization(AbstractAutowireCapableBeanFactory.java:350)
	at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.initializeBean(AbstractAutowireCapableBeanFactory.java:1329)
	at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:471)
	at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory$1.run(AbstractAutowireCapableBeanFactory.java:409)
	at java.security.AccessController.doPrivileged(Native Method)
	at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:380)
	at org.springframework.beans.factory.support.AbstractBeanFactory$2.getObject(AbstractBeanFactory.java:302)
	at org.springframework.web.context.request.AbstractRequestAttributesScope.get(AbstractRequestAttributesScope.java:43)
	at org.springframework.web.context.request.SessionScope.get(SessionScope.java:90)
	at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:298)
	at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:185)
	at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:164)
	at org.springframework.context.support.AbstractApplicationContext.getBean(AbstractApplicationContext.java:881)
	at org.springframework.beans.factory.access.el.SpringBeanELResolver.getValue(SpringBeanELResolver.java:58)
	at javax.el.CompositeELResolver.getValue(CompositeELResolver.java:54)
	at com.sun.faces.el.FacesCompositeELResolver.getValue(FacesCompositeELResolver.java:58)
	at org.apache.el.parser.AstIdentifier.getValue(AstIdentifier.java:69)
	at org.apache.el.parser.AstValue.getValue(AstValue.java:112)
	at org.apache.el.ValueExpressionImpl.getValue(ValueExpressionImpl.java:186)
	at org.apache.jasper.el.JspValueExpression.getValue(JspValueExpression.java:101)
	at com.sun.faces.application.ApplicationImpl.createComponent(ApplicationImpl.java:198)
	... 39 more
Caused by: java.lang.NullPointerException
	at ma.it.bean.NewsBean.init(NewsBean.java:25)
	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
	at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
	at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
	at java.lang.reflect.Method.invoke(Unknown Source)
	at org.springframework.beans.factory.annotation.InitDestroyAnnotationBeanPostProcessor$LifecycleElement.invoke(InitDestroyAnnotationBeanPostProcessor.java:297)
	at org.springframework.beans.factory.annotation.InitDestroyAnnotationBeanPostProcessor$LifecycleMetadata.invokeInitMethods(InitDestroyAnnotationBeanPostProcessor.java:250)
	at org.springframework.beans.factory.annotation.InitDestroyAnnotationBeanPostProcessor.postProcessBeforeInitialization(InitDestroyAnnotationBeanPostProcessor.java:144)
	... 60 more
9 mai 2012 16:17:00 org.apache.catalina.core.StandardWrapperValve invoke
GRAVE: "Servlet.service()" pour la servlet Faces Servlet a généré une exception
java.lang.NullPointerException
	at ma.it.bean.NewsBean.init(NewsBean.java:25)
	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
	at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
	at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
	at java.lang.reflect.Method.invoke(Unknown Source)
	at org.springframework.beans.factory.annotation.InitDestroyAnnotationBeanPostProcessor$LifecycleElement.invoke(InitDestroyAnnotationBeanPostProcessor.java:297)
	at org.springframework.beans.factory.annotation.InitDestroyAnnotationBeanPostProcessor$LifecycleMetadata.invokeInitMethods(InitDestroyAnnotationBeanPostProcessor.java:250)
	at org.springframework.beans.factory.annotation.InitDestroyAnnotationBeanPostProcessor.postProcessBeforeInitialization(InitDestroyAnnotationBeanPostProcessor.java:144)
	at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.applyBeanPostProcessorsBeforeInitialization(AbstractAutowireCapableBeanFactory.java:350)
	at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.initializeBean(AbstractAutowireCapableBeanFactory.java:1329)
	at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:471)
	at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory$1.run(AbstractAutowireCapableBeanFactory.java:409)
	at java.security.AccessController.doPrivileged(Native Method)
	at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:380)
	at org.springframework.beans.factory.support.AbstractBeanFactory$2.getObject(AbstractBeanFactory.java:302)
	at org.springframework.web.context.request.AbstractRequestAttributesScope.get(AbstractRequestAttributesScope.java:43)
	at org.springframework.web.context.request.SessionScope.get(SessionScope.java:90)
	at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:298)
	at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:185)
	at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:164)
	at org.springframework.context.support.AbstractApplicationContext.getBean(AbstractApplicationContext.java:881)
	at org.springframework.beans.factory.access.el.SpringBeanELResolver.getValue(SpringBeanELResolver.java:58)
	at javax.el.CompositeELResolver.getValue(CompositeELResolver.java:54)
	at com.sun.faces.el.FacesCompositeELResolver.getValue(FacesCompositeELResolver.java:58)
	at org.apache.el.parser.AstIdentifier.getValue(AstIdentifier.java:69)
	at org.apache.el.parser.AstValue.getValue(AstValue.java:112)
	at org.apache.el.ValueExpressionImpl.getValue(ValueExpressionImpl.java:186)
	at org.apache.jasper.el.JspValueExpression.getValue(JspValueExpression.java:101)
	at com.sun.faces.application.ApplicationImpl.createComponent(ApplicationImpl.java:198)
	at javax.faces.webapp.UIComponentELTag.createComponent(UIComponentELTag.java:215)
	at javax.faces.webapp.UIComponentClassicTagBase.createChild(UIComponentClassicTagBase.java:454)
	at javax.faces.webapp.UIComponentClassicTagBase.findComponent(UIComponentClassicTagBase.java:635)
	at javax.faces.webapp.UIComponentClassicTagBase.doStartTag(UIComponentClassicTagBase.java:1033)
	at org.apache.jsp.Views.News_jsp._jspx_meth_p_005fdataTable_005f0(News_jsp.java:210)
	at org.apache.jsp.Views.News_jsp._jspx_meth_h_005fform_005f0(News_jsp.java:170)
	at org.apache.jsp.Views.News_jsp._jspx_meth_f_005fview_005f0(News_jsp.java:125)
	at org.apache.jsp.Views.News_jsp._jspService(News_jsp.java:88)
	at org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:70)
	at javax.servlet.http.HttpServlet.service(HttpServlet.java:717)
	at org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:388)
	at org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:313)
	at org.apache.jasper.servlet.JspServlet.service(JspServlet.java:260)
	at javax.servlet.http.HttpServlet.service(HttpServlet.java:717)
	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:290)
	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
	at org.apache.catalina.core.ApplicationDispatcher.invoke(ApplicationDispatcher.java:646)
	at org.apache.catalina.core.ApplicationDispatcher.processRequest(ApplicationDispatcher.java:436)
	at org.apache.catalina.core.ApplicationDispatcher.doForward(ApplicationDispatcher.java:374)
	at org.apache.catalina.core.ApplicationDispatcher.forward(ApplicationDispatcher.java:302)
	at com.sun.faces.context.ExternalContextImpl.dispatch(ExternalContextImpl.java:414)
	at com.sun.faces.application.ViewHandlerImpl.executePageToBuildView(ViewHandlerImpl.java:455)
	at com.sun.faces.application.ViewHandlerImpl.renderView(ViewHandlerImpl.java:139)
	at com.sun.faces.lifecycle.RenderResponsePhase.execute(RenderResponsePhase.java:108)
	at com.sun.faces.lifecycle.LifecycleImpl.phase(LifecycleImpl.java:266)
	at com.sun.faces.lifecycle.LifecycleImpl.render(LifecycleImpl.java:159)
	at javax.faces.webapp.FacesServlet.service(FacesServlet.java:245)
	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:290)
	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
	at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:233)
	at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:191)
	at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:127)
	at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:102)
	at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:109)
	at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:293)
	at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:859)
	at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(Http11Protocol.java:602)
	at org.apache.tomcat.util.net.JIoEndpoint$Worker.run(JIoEndpoint.java:489)
	at java.lang.Thread.run(Unknown Source)

Voici le code de ma classe News.java

Code :

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package ma.it.model;
 
// Generated 7 mai 2012 12:58:17 by Hibernate Tools 3.4.0.CR1
 
import javax.persistence.Column;
import javax.persistence.Entity;
import javax.persistence.GeneratedValue;
import static javax.persistence.GenerationType.IDENTITY;
import javax.persistence.Id;
import javax.persistence.Table;
/**
 * News generated by hbm2java
 */
@Entity
@Table(name = "news", catalog = "bdd_itrekrute")
public class News implements java.io.Serializable {
 
	private Integer idNews;
	private String titre;
	private String description;
 
	public News() {
	}
 
	public News(String titre, String description) {
		this.titre = titre;
		this.description = description;
	}
 
	@Id
	@GeneratedValue(strategy = IDENTITY)
	@Column(name = "idNews", unique = true, nullable = false)
	public Integer getIdNews() {
		return this.idNews;
	}
 
	public void setIdNews(Integer idNews) {
		this.idNews = idNews;
	}
 
	@Column(name = "titre")
	public String getTitre() {
		return this.titre;
	}
 
	public void setTitre(String titre) {
		this.titre = titre;
	}
 
	@Column(name = "description")
	public String getDescription() {
		return this.description;
	}
 
	public void setDescription(String description) {
		this.description = description;
	}
	@Override
	public String toString() 
	{
		return "id "+ this.idNews +" titre : "+this.titre+" description "+this.description;
	}
 
}

ci-dessous le code de la page NewsBean.java :

Code :

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package ma.it.bean;
 
import java.io.*;
import java.util.List;
 
import javax.annotation.PostConstruct;
 
import ma.it.service.NewsService;
import ma.it.model.News;
 
import org.primefaces.component.datatable.DataTable;
import org.springframework.context.annotation.Scope;
import org.springframework.stereotype.Component;
 
 
@Component("NewsBean")
@Scope("session")
public class NewsBean implements Serializable{
	private transient NewsService newsService;
	private transient DataTable NewsTable;
	private List<News> NewsList;
 
	@PostConstruct
	public void init() {
		this.NewsList=this.newsService.findAll();
	}
	public DataTable getNewsTable() {
		return NewsTable;
	}
 
	public void setNewsTable(DataTable newsTable) {
		this.NewsTable = newsTable;
	}
	public List<News> getNewsList() {
		return NewsList;
	}
	public void setNewsList(List<News> newsList) {
		this.NewsList = newsList;
	}
 
	}

Et finalement , voici le code de la page News.jsp :

Code :

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<%@ page contentType="text/html" pageEncoding="UTF-8"%>
<%@ taglib uri="http://java.sun.com/jsf/core" prefix="f"%>
<%@ taglib uri="http://java.sun.com/jsf/html" prefix="h"%>
<%@ taglib uri="http://primefaces.prime.com.tr/ui" prefix="p"%>
 
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1">
<title>Insert title here</title>
</head>
<body>
	<f:view>
		<h:form prependId="false">
			<p:dataTable id="basic" var="News" binding="#{NewsBean.newsTable}"
				value="#{NewsBean.newsList}">
				<p:column id="modelHeader">
					<f:facet name="idNews">  
                    idNews 
            </f:facet>
					<h:outputText value="#{News.idNews}" />
				</p:column>
 
				<p:column>
					<f:facet name="titre">  
                    Titre  
            </f:facet>
					<h:outputText value="#{News.titre}" />
				</p:column>
 
			</p:dataTable>
		</h:form>
 
	</f:view>
</body>
</html>

Est ce quelqu'un a une idée sur la solution de cet erreur ????

**Mathieu.J** · 09/05/2012, 17h37

Ta variable this.newsService n'est pas initialisée.

Code :

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public class NewsBean implements Serializable{
	private transient NewsService newsService;
	private transient DataTable NewsTable;
	private List<News> NewsList;
 
	@PostConstruct
	public void init() {
		this.NewsList=this.newsService.findAll(); // newsService non initialisé
	}

Au passage, en général en java, on ne commence pas le nom d'une variable par une majuscule : NewsTable => newsTable

**lamia89** · 09/05/2012, 21h28

Merci de votre réponse , mais ça ne marche toujours pas , j'ai toujours la même exception que ce soit avec ou sans instanciation de l'objet newsListe sinon est ce que vous pouvez me valider la requête HQL de sélection parce que je débute avec hibernate :

Code :

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return sessionFactory.getCurrentSession().createQuery(" from  News news").list();

**Mathieu.J** · 10/05/2012, 10h22

Envoyé par lamia89

ça ne marche toujours pas , j'ai toujours la même exception que ce soit avec ou sans instanciation de l'objet newsListe

Normal vu que c'est newsService et non newsListequi n'est pas instancié.

**lamia89** · 10/05/2012, 10h28

Envoyé par Mathieu.J

Normal vu que c'est newsService et non newsListequi n'est pas instancié.

même si j'anstancie NewsService l'exception est levée , sachant que j'ai effectué un test sur la fonction findAll() en utilisant JUnit et la requête HQL est juste il me retourne tous les objets News.

**Mathieu.J** · 10/05/2012, 11h06

Es-tu certain que la stacktrace est identique après avoir instancié ton service ?
Même type d'exception ne signifie pas même exception

Exception "java.lang.NullPointerException"

Java EE

Vue hybride

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