liste vide avec l'erreur java.lang.NullPointerException

Version imprimable

2 pièce(s) jointe(s)

Bonjour tout le monde,

je travaille avec spring, hibernate et jsf (primefaces) ainsi que tomcat 7 et mysql (xampp et mysql workbench)
ma première page sert à afficher une liste retournée par une méthode et stockée par la variable "listDerivations" (qui a le getter et le setter).
tout d'abord voici l'architecture du projet.
Pièce jointe 192717
et voici le code de mes différentes class et interface et fichiers de configuration

com.model.derivation

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package com.model;
import javax.persistence.Column;
import javax.persistence.Entity;
import javax.persistence.Id;
import javax.persistence.Table;
import javax.validation.constraints.NotNull;
 
@Entity
@Table(name="derivation") // nom de la table dans la base de données (sans majuscules)
public class Derivation {
	@Id
	@NotNull
	private int idderivation;
	@Column
	private int code_derivation;
	@Column
	private String libelle_derivation;
	@Column
	private int etat_derivation;
	// Constructeurs avec et sans arguments
	// Getters and Setters
}

com.service.DerivationService

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package com.service;
import java.util.List;
import com.model.Derivation;
public interface DerivationService {
	public List<Derivation> findAll();
}

com.service.DerivationServiceImpl

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package com.service;
import java.util.List;
import org.hibernate.SessionFactory;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import org.springframework.transaction.annotation.Transactional;
import com.model.Derivation;
 
@Service("derivationService")
@Transactional
public class DerivationServiceImpl implements DerivationService {
	@Autowired
	private SessionFactory sessionFactory;
	@Override
	public List<Derivation> findAll() {
	return (List<Derivation>)this.sessionFactory.getCurrentSession().createQuery("from derivation").list();
	}
}

com.beans.DerivationBean

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package com.beans;
import java.util.ArrayList;
import java.util.List;
import javax.faces.bean.ManagedBean;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.context.annotation.Scope;
import com.model.Derivation;
import com.service.DerivationService;
 
@ManagedBean(name="derivationBean")
@Scope
public class DerivationBean {
	private List<Derivation> listDerivations = new ArrayList<Derivation>();
	@Autowired 
	private DerivationService derivationService;
 
	public List<Derivation> getListDerivations() {
		listDerivations = derivationService.findAll();
		//Derivation d = new Derivation();
		//d.setLibelle_derivation("test");
		//listDerivations.add(d);
		return listDerivations;
	}
	public void setListDerivations(List<Derivation> listDerivations) {
		this.listDerivations = listDerivations;
	}
}

application-context.xml

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<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
	xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
	xmlns:aop="http://www.springframework.org/schema/aop"
	xmlns:context="http://www.springframework.org/schema/context"
	xmlns:tx="http://www.springframework.org/schema/tx"
	xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd
		http://www.springframework.org/schema/aop http://www.springframework.org/schema/aop/spring-aop-3.2.xsd
		http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-3.2.xsd
		http://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx-3.2.xsd">
 
<bean id="dataSource" class="com.mchange.v2.c3p0.ComboPooledDataSource">
	<property name="driverClass" value="org.gjt.mm.mysql.Driver"></property>
	<property name="user" value="root"/>
	<property name="password" value=""/>
	<property name="jdbcUrl" value="jdbc:mysql://localhost:3306/atgdb"></property>
</bean>
 
<bean id="sessionFactory" class="org.springframework.orm.hibernate4.LocalSessionFactoryBean">
	<property name="dataSource" ref="dataSource"/>
	<property name="packagesToScan" value="com.model"/>
	<property name="hibernateProperties">
		<props>
			<prop key="hibernate.dialect">org.hibernate.dialect.MySQLDialect</prop>
			<prop key="hibernate.connection.provider_class">org.hibernate.connection.C3P0ConnectionProvider</prop>
		</props>
	</property>
</bean>
 
<bean id="transactionManager" class="org.springframework.orm.hibernate4.HibernateTransactionManager">
	<property name="sessionFactory" ref="sessionFactory"></property>
</bean>
 
<tx:annotation-driven transaction-manager="transactionManager"/>
<context:annotation-config/>
<context:component-scan base-package="com"></context:component-scan>
</beans>

web.xml

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<?xml version="1.0" encoding="ASCII"?>
<web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://java.sun.com/xml/ns/javaee" xmlns:web="http://java.sun.com/xml/ns/javaee" xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_3_0.xsd" version="3.0">
  <display-name></display-name>
 
  <context-param>
  	<param-name>contextConfigLocation</param-name>
  	<param-value>classpath:application-context.xml</param-value>
  </context-param>
 
  <listener>
  	<listener-class>org.springframework.web.context.ContextLoaderListener</listener-class>
  </listener>
  <listener>
  	<listener-class>org.springframework.web.context.request.RequestContextListener</listener-class>
  </listener>
 
  <servlet>
  	<servlet-name>Faces Servlet</servlet-name>
  	<servlet-class>javax.faces.webapp.FacesServlet</servlet-class>
  	<load-on-startup>1</load-on-startup>
  </servlet>
 
  <servlet-mapping>
  	<servlet-name>Faces Servlet</servlet-name>
  	<url-pattern>*.xhtml</url-pattern>
  </servlet-mapping>
 
  <welcome-file-list>
    <welcome-file>listderivations.xhtml</welcome-file>
  </welcome-file-list>
 
  </web-app>

faces-config.xml

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<?xml version="1.0" encoding="UTF-8"?>
<faces-config
    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-facesconfig_2_0.xsd"
    version="2.0">
 
    <application>
    	<el-resolver>org.springframework.web.jsf.el.SpringBeanFacesELResolver</el-resolver>
    </application>
</faces-config>

la page d'affichage listderivations.xhtml

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<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"
      >
<h:head>
 
</h:head>
<h:body>
<h:outputLabel value="testaffichage"></h:outputLabel>
		<p:dataTable value="#{derivationBean.listDerivations}" var="derivation">
			<p:column headerText="Id Derivation">
				<h:outputText value="#{derivation.idderivation}"/>
			</p:column>
			<p:column headerText="Code Derivation">
				<h:outputText value="#{derivation.code_derivation}"/>
			</p:column>
			<p:column headerText="Libelle Derivation">
				<h:outputText value="#{derivation.libelle_derivation}"/>
			</p:column>
			<p:column headerText="Etat Derivation">
				<h:outputText value="#{derivation.etat_derivation}"/>
			</p:column>
		</p:dataTable>
</h:body>
</html>

quand je lance l'application, j'ai l'erreur suivante :

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nov. 15, 2015 1:30:58 PM com.sun.faces.application.view.FaceletViewHandlingStrategy handleRenderException
GRAVE: Error Rendering View[/listderivations.xhtml]
javax.el.ELException: /listderivations.xhtml @15,75 value="#{derivationBean.listDerivations}": Error reading 'listDerivations' on type com.beans.DerivationBean
	at com.sun.faces.facelets.el.TagValueExpression.getValue(TagValueExpression.java:114)
	at javax.faces.component.ComponentStateHelper.eval(ComponentStateHelper.java:194)
	at javax.faces.component.ComponentStateHelper.eval(ComponentStateHelper.java:182)
	at javax.faces.component.UIData.getValue(UIData.java:732)
	at org.primefaces.component.api.UIData.getDataModel(UIData.java:759)
	at javax.faces.component.UIData.getRowCount(UIData.java:356)
	at org.primefaces.component.datatable.DataTableRenderer.encodeTbody(DataTableRenderer.java:806)
	at org.primefaces.component.datatable.DataTableRenderer.encodeTbody(DataTableRenderer.java:788)
	at org.primefaces.component.datatable.DataTableRenderer.encodeRegularTable(DataTableRenderer.java:281)
	at org.primefaces.component.datatable.DataTableRenderer.encodeMarkup(DataTableRenderer.java:243)
	at org.primefaces.component.datatable.DataTableRenderer.encodeEnd(DataTableRenderer.java:85)
	at javax.faces.component.UIComponentBase.encodeEnd(UIComponentBase.java:924)
	at javax.faces.component.UIComponent.encodeAll(UIComponent.java:1863)
	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 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:305)
	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:210)
	at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:222)
	at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:123)
	at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:502)
	at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:171)
	at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:99)
	at org.apache.catalina.valves.AccessLogValve.invoke(AccessLogValve.java:953)
	at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:118)
	at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:408)
	at org.apache.coyote.http11.AbstractHttp11Processor.process(AbstractHttp11Processor.java:1023)
	at org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:589)
	at org.apache.tomcat.util.net.JIoEndpoint$SocketProcessor.run(JIoEndpoint.java:310)
	at java.util.concurrent.ThreadPoolExecutor.runWorker(Unknown Source)
	at java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source)
	at java.lang.Thread.run(Unknown Source)
Caused by: javax.el.ELException: Error reading 'listDerivations' on type com.beans.DerivationBean
	at javax.el.BeanELResolver.getValue(BeanELResolver.java:98)
	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.AstValue.getValue(AstValue.java:183)
	at org.apache.el.ValueExpressionImpl.getValue(ValueExpressionImpl.java:185)
	at com.sun.faces.facelets.el.TagValueExpression.getValue(TagValueExpression.java:109)
	... 36 more
Caused by: java.lang.NullPointerException
	at com.beans.DerivationBean.getListDerivations(DerivationBean.java:30)
	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 javax.el.BeanELResolver.getValue(BeanELResolver.java:87)
	... 41 more
 
nov. 15, 2015 1:30:58 PM org.apache.catalina.core.StandardWrapperValve invoke
GRAVE: Servlet.service() for servlet [Faces Servlet] in context with path [/checkingatg] threw exception [null] with root cause
java.lang.NullPointerException
	at com.beans.DerivationBean.getListDerivations(DerivationBean.java:30)
	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 javax.el.BeanELResolver.getValue(BeanELResolver.java:87)
	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.AstValue.getValue(AstValue.java:183)
	at org.apache.el.ValueExpressionImpl.getValue(ValueExpressionImpl.java:185)
	at com.sun.faces.facelets.el.TagValueExpression.getValue(TagValueExpression.java:109)
	at javax.faces.component.ComponentStateHelper.eval(ComponentStateHelper.java:194)
	at javax.faces.component.ComponentStateHelper.eval(ComponentStateHelper.java:182)
	at javax.faces.component.UIData.getValue(UIData.java:732)
	at org.primefaces.component.api.UIData.getDataModel(UIData.java:759)
	at javax.faces.component.UIData.getRowCount(UIData.java:356)
	at org.primefaces.component.datatable.DataTableRenderer.encodeTbody(DataTableRenderer.java:806)
	at org.primefaces.component.datatable.DataTableRenderer.encodeTbody(DataTableRenderer.java:788)
	at org.primefaces.component.datatable.DataTableRenderer.encodeRegularTable(DataTableRenderer.java:281)
	at org.primefaces.component.datatable.DataTableRenderer.encodeMarkup(DataTableRenderer.java:243)
	at org.primefaces.component.datatable.DataTableRenderer.encodeEnd(DataTableRenderer.java:85)
	at javax.faces.component.UIComponentBase.encodeEnd(UIComponentBase.java:924)
	at javax.faces.component.UIComponent.encodeAll(UIComponent.java:1863)
	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 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:305)
	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:210)
	at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:222)
	at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:123)
	at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:502)
	at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:171)
	at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:99)
	at org.apache.catalina.valves.AccessLogValve.invoke(AccessLogValve.java:953)
	at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:118)
	at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:408)
	at org.apache.coyote.http11.AbstractHttp11Processor.process(AbstractHttp11Processor.java:1023)
	at org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:589)
	at org.apache.tomcat.util.net.JIoEndpoint$SocketProcessor.run(JIoEndpoint.java:310)
	at java.util.concurrent.ThreadPoolExecutor.runWorker(Unknown Source)
	at java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source)
	at java.lang.Thread.run(Unknown Source)

je ne vois pas pourquoi l'erreur retourne que la liste est vide alors que la table "derivation" dans la bd contient 2 lignes.
merci à vous.

16/11/2015, 09h01
jeffray03

salut,
ta variable

Code:

derivationService

doit etre null, essaies de l´afficher pour en etre sur.

Eric

Citation:

Envoyé par jeffray03

salut,
ta variable

Code:

derivationService

doit etre null, essaies de l´afficher pour en etre sur.

Eric

Bonjour Eric,
je pense que vous avez raison, en rectifiant l'instantiation de la variable

Code:

derivationService

dans le "DerivationBean" comme suit : (je pense que c'est faux ce que j'ai fait !! )
Code:

1 2 3 4 5 6 7 8 @Autowired private DerivationService derivationService = new DerivationService() { @Override public List<Derivation> findAll() { // TODO Auto-generated method stub return null; } };
la liste est affichée sans résultat, aucune ligne retournée.

16/11/2015, 10h58
Maine13

Bonjour,

Je ne sais pas si je me trompe mais je ne vois pas ou tu as chargé ton modèle "listDerivations" dans ton bean managé "DerivationBean" puisque tu le passe comme paramètre dans ton tableau.

Il y'a trois solutions possible:
1- Que tu charge ton modèle ("listDerivations" dans ton Bean managé) dans une méthode annotée par un @postContruct puisque tu travaille avec JSF(la manière la plus simple).
2- Que tu l'injecte comme une dépendance puisque tu travaille avec spring.
3- Que tu passe ta méthode getListDerivations() comme paramètre pour ton tableau dans page .xhtml.

Citation:

Envoyé par Maine13

Bonjour,

Je ne sais pas si je me trompe mais je ne vois pas ou tu as chargé ton modèle "listDerivations" dans ton bean managé "DerivationBean" puisque tu le passe comme paramètre dans ton tableau.

Il y'a trois solutions possible:
1- Que tu charge ton modèle ("listDerivations" dans ton Bean managé) dans une méthode annotée par un @postContruct puisque tu travaille avec JSF(la manière la plus simple).
2- Que tu l'injecte comme une dépendance puisque tu travaille avec spring.
3- Que tu passe ta méthode getListDerivations() comme paramètre pour ton tableau dans page .xhtml.

Bonjour,

Effectivement j'ai essayé les 3 solutions, voici le code du bean managé :
Code:

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 package com.beans; import java.util.ArrayList; import java.util.List; import javax.annotation.PostConstruct; import javax.faces.bean.ManagedBean; import org.springframework.beans.factory.annotation.Autowired; import org.springframework.context.annotation.Scope; import com.model.Derivation; import com.service.DerivationService; @ManagedBean(name="derivationBean") @Scope public class DerivationBean { private List<Derivation> listDerivations = new ArrayList<Derivation>(); @Autowired private DerivationService derivationService; public List<Derivation> getListDerivations() { listDerivations = derivationService.findAll(); return listDerivations; } public void setListDerivations(List<Derivation> listDerivations) { this.listDerivations = listDerivations; } @PostConstruct public List<Derivation> retournerListDerivations(){ return this.getListDerivations(); } }
dans la page, voilà

Code:

<p:dataTable value="#{derivationBean.retournerListDerivations()}" var="derivation">

Essai de modifier comme suit

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package com.beans;
import java.util.ArrayList;
import java.util.List;
import javax.annotation.PostConstruct;
import javax.faces.bean.ManagedBean;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.context.annotation.Scope;
import com.model.Derivation;
import com.service.DerivationService;
 
@ManagedBean(name="derivationBean")
@ViewScoped
public class DerivationBean {
	public List<Derivation> listDerivations;
	@Autowired
	private DerivationService derivationService;
 
	public List<Derivation> getListDerivations() {
		return listDerivations;
	}
	public void setListDerivations(List<Derivation> listDerivations) {
		this.listDerivations = listDerivations;
	}
	@PostConstruct
	public void init(){
		listDerivations = new ArrayList<Derivation>();
                listDerivations = derivationService.findAll();
	}
}

Code:

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<p:dataTable value="#{derivationBean.listDerivations}" var="derivation">

Citation:

Envoyé par Maine13

Essai de modifier comme suit

Code:

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package com.beans;
import java.util.ArrayList;
import java.util.List;
import javax.annotation.PostConstruct;
import javax.faces.bean.ManagedBean;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.context.annotation.Scope;
import com.model.Derivation;
import com.service.DerivationService;
 
@ManagedBean(name="derivationBean")
@ViewScoped
public class DerivationBean {
	public List<Derivation> listDerivations;
	@Autowired
	private DerivationService derivationService;
 
	public List<Derivation> getListDerivations() {
		return listDerivations;
	}
	public void setListDerivations(List<Derivation> listDerivations) {
		this.listDerivations = listDerivations;
	}
	@PostConstruct
	public void init(){
		listDerivations = new ArrayList<Derivation>();
                listDerivations = derivationService.findAll();
	}
}

Code:

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<p:dataTable value="#{derivationBean.listDerivations}" var="derivation">

j'ai essayé votre code mais j'ai eu l'erreur suivante avec toujours la liste (NullPointerException)

Code:

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GRAVE: Error Rendering View[/listderivations.xhtml]
com.sun.faces.mgbean.ManagedBeanCreationException: Erreur lors de l’injection de ressources dans le bean géré «derivationBean»
	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)

Code:

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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 com.beans.DerivationBean.init(DerivationBean.java:43)
	... 54 more

16/11/2015, 11h36
Maine13
Tu peux s'il te plait mettre lors de l'injection de ton service
Code:

1 2 3 @ManagedProperty("#{derivationService}") private DerivationService derivationService;

Citation:
Envoyé par Maine13
Tu peux s'il te plait mettre lors de l'injection de ton service
Code:

1 2 3 @ManagedProperty("#{derivationService}") private DerivationService derivationService;
j'ai essayé, voici ce que j'ai comme erreur :
Code:

1 2 com.sun.faces.mgbean.ManagedBeanCreationException: Impossible de créer le bean géré «derivationBean». Les problèmes suivants ont été détectés : - La propriété «derivationService» du bean géré «derivationBean» n’existe pas.
est-ce qu'il se peut que la méthode findAll() ne permet pas de récupérer les données de la base de données ?

16/11/2015, 12h59
jeffray03
salut,
essaies de mettre a la place de
Code:

1 2 @ViewScoped
ceci
Code:

1 2 @SessionScoped
Eric

Ton code semble correcte !!!!!
L'instruction <context:component-scan base-package="..."/> permet d'injecter tous les bean disponible dans ton package
Mais essai d'injecter ton bean dans ton application-context.xml comme suit
Code:

1 2 3 <bean id="derivationService" class="Path_de ton_service"> </bean>
dans ton managedBean
Code:

1 2 3 4 5 6 7 8 9 10 11 @managedBean @viewScoped// ou le scope dont tu as besoin public class... ..... @ManagedProperty("#{derivationService}") DerivationService derivationService; public void getTestMethod(){ derivationService.canDoAnyThingFromService(); }
Après tu peux soit chargé ton modèle depuis le postContruct ou de faire appel à n'importe quel méthode dans ta page.xhtml.