[débutant] EntityManager : null pointer exception

Bonjour,
je suis novice en en JEE. Je travaille donc sous glassfish téléchargé dans le bundle netbeans
J'ai un entity Personne, et un session bean stateless qui accede à cet entity.
Dans ce bean j'ai un entityManager injecté avec @PersistenceContext(unitName="App1PU"), dans mon fichier persistence.xml j'ai bien <persistence-unit name="App1PU" >
Lors de l'appel de ma page jsp j'ai donc un null pointer exception sur mon entitymanager lors de la methode createQuery().

Je ne sais vraiment pas d'où ça vient mon pool de connection est OK le ping réussi.

J'ai parcouru de nombreux forum mais je n'ai pas trouvé la solution à mon problème, mon code semble exact, je ne sais pas d'où ça peut venir, un problème dans la configuration de glassfish peut être ??

Je vous colle le code :
l'entity

Code:

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/*
 * To change this template, choose Tools | Templates
 * and open the template in the editor.
 */
 
package entity;
 
import java.io.Serializable;
import javax.persistence.Basic;
import javax.persistence.Column;
import javax.persistence.Entity;
import javax.persistence.Id;
import javax.persistence.NamedQueries;
import javax.persistence.NamedQuery;
import javax.persistence.Table;
 
/**
 *
 * @author Mathieu
 */
@Entity
@Table(name = "PERSONNE")
@NamedQueries({@NamedQuery(name = "Personne.findAll", query = "SELECT p FROM Personne p"), @NamedQuery(name = "Personne.findByNom", query = "SELECT p FROM Personne p WHERE p.nom = :nom"), @NamedQuery(name = "Personne.findByPrenom", query = "SELECT p FROM Personne p WHERE p.prenom = :prenom")})
public class Personne implements Serializable {
    private static final long serialVersionUID = 1L;
    @Id
    @Basic(optional = false)
    @Column(name = "NOM")
    private String nom;
    @Basic(optional = false)
    @Column(name = "PRENOM")
    private String prenom;
 
    public Personne() {
    }
 
    public Personne(String nom) {
        this.nom = nom;
    }
 
    public Personne(String nom, String prenom) {
        this.nom = nom;
        this.prenom = prenom;
    }
 
    public String getNom() {
        return nom;
    }
 
    public void setNom(String nom) {
        this.nom = nom;
    }
 
    public String getPrenom() {
        return prenom;
    }
 
    public void setPrenom(String prenom) {
        this.prenom = prenom;
    }
 
    @Override
    public int hashCode() {
        int hash = 0;
        hash += (nom != null ? nom.hashCode() : 0);
        return hash;
    }
 
    @Override
    public boolean equals(Object object) {
        // TODO: Warning - this method won't work in the case the id fields are not set
        if (!(object instanceof Personne)) {
            return false;
        }
        Personne other = (Personne) object;
        if ((this.nom == null && other.nom != null) || (this.nom != null && !this.nom.equals(other.nom))) {
            return false;
        }
        return true;
    }
 
    @Override
    public String toString() {
        return "entity.Personne[nom=" + nom + "]";
    }
 
}

persistence.xml

Code:

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<?xml version="1.0" encoding="UTF-8"?>
<persistence>
  <persistence-unit name="App1PU" >
    <jta-data-source>jdbc/App1</jta-data-source>
    <properties/>
 
  </persistence-unit>
</persistence>

l'interface du session bean

Code:

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package bean;
 
import javax.ejb.Local;
 
/**
 *
 * @author Mathieu
 */
@Local
public interface AccesPersonneLocal {
   public String getPrenom(String nom);
 
}

le session bean

Code:

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package bean;
 
import javax.ejb.Stateless;
import javax.persistence.EntityManager;
import javax.persistence.PersistenceContext;
 
/**
 *
 * @author Mathieu
 */
@Stateless
public class AccesPersonneBean implements AccesPersonneLocal {
 
 
    @PersistenceContext(unitName="App1PU")
    EntityManager em;
 
    public AccesPersonneBean(){
    }
 
    public String getPrenom(String nom) {
       return (String) em.createQuery("SELECT prenom FROM Personne p where nom="+nom).getSingleResult();
    }
 
}

server.log

Code:

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12 févr. 2009 01:06:07 com.sun.enterprise.admin.servermgmt.launch.ASLauncher buildCommand
INFO: 
C:/Program Files/Java/jdk1.6.0_02\bin\java
-Dcom.sun.aas.instanceRoot=C:/Program Files/glassfish-v2ur2/domains/domain1
-Dcom.sun.aas.ClassPathPrefix=
-Dcom.sun.aas.ClassPathSuffix=
-Dcom.sun.aas.ServerClassPath=
-Dcom.sun.aas.classloader.appserverChainJars.ee=
-Dcom.sun.aas.classloader.appserverChainJars=admin-cli.jar,admin-cli-ee.jar,j2ee-svc.jar
-Dcom.sun.aas.classloader.excludesList=admin-cli.jar,appserv-upgrade.jar,sun-appserv-ant.jar
-Dcom.sun.aas.classloader.optionalOverrideableChain.ee=
-Dcom.sun.aas.classloader.optionalOverrideableChain=webservices-rt.jar,webservices-tools.jar
-Dcom.sun.aas.classloader.serverClassPath.ee=/lib/hadbjdbc4.jar,C:/Program Files/glassfish-v2ur2/lib/SUNWjdmk/5.1/lib/jdmkrt.jar,/lib/dbstate.jar,/lib/hadbm.jar,/lib/hadbmgt.jar,C:/Program Files/glassfish-v2ur2/lib/SUNWmfwk/lib/mfwk_instrum_tk.jar
-Dcom.sun.aas.classloader.serverClassPath=C:/Program Files/glassfish-v2ur2/lib/install/applications/jmsra/imqjmsra.jar,C:/Program Files/glassfish-v2ur2/imq/lib/jaxm-api.jar,C:/Program Files/glassfish-v2ur2/imq/lib/fscontext.jar,C:/Program Files/glassfish-v2ur2/imq/lib/imqbroker.jar,C:/Program Files/glassfish-v2ur2/imq/lib/imqjmx.jar,C:/Program Files/glassfish-v2ur2/lib/ant/lib/ant.jar,C:/Program Files/glassfish-v2ur2/lib/SUNWjdmk/5.1/lib/jdmkrt.jar
-Dcom.sun.aas.classloader.sharedChainJars.ee=appserv-se.jar,appserv-ee.jar,jesmf-plugin.jar,/lib/dbstate.jar,/lib/hadbjdbc4.jar,jgroups-all.jar,C:/Program Files/glassfish-v2ur2/lib/SUNWmfwk/lib/mfwk_instrum_tk.jar
-Dcom.sun.aas.classloader.sharedChainJars=javaee.jar,C:/Program Files/Java/jdk1.6.0_02/lib/tools.jar,install/applications/jmsra/imqjmsra.jar,com-sun-commons-launcher.jar,com-sun-commons-logging.jar,C:/Program Files/glassfish-v2ur2/imq/lib/jaxm-api.jar,C:/Program Files/glassfish-v2ur2/imq/lib/fscontext.jar,C:/Program Files/glassfish-v2ur2/imq/lib/imqbroker.jar,C:/Program Files/glassfish-v2ur2/imq/lib/imqjmx.jar,C:/Program Files/glassfish-v2ur2/imq/lib/imqxm.jar,webservices-rt.jar,webservices-tools.jar,mail.jar,appserv-jstl.jar,jmxremote_optional.jar,C:/Program Files/glassfish-v2ur2/lib/SUNWjdmk/5.1/lib/jdmkrt.jar,activation.jar,appserv-rt.jar,appserv-admin.jar,appserv-cmp.jar,C:/Program Files/glassfish-v2ur2/updatecenter/lib/updatecenter.jar,C:/Program Files/glassfish-v2ur2/jbi/lib/jbi.jar,C:/Program Files/glassfish-v2ur2/imq/lib/imqjmx.jar,C:/Program Files/glassfish-v2ur2/lib/ant/lib/ant.jar,dbschema.jar
-Dcom.sun.aas.configName=server-config
-Dcom.sun.aas.configRoot=C:/Program Files/glassfish-v2ur2/config
-Dcom.sun.aas.defaultLogFile=C:/Program Files/glassfish-v2ur2/domains/domain1/logs/server.log
-Dcom.sun.aas.domainName=domain1
-Dcom.sun.aas.installRoot=C:/Program Files/glassfish-v2ur2
-Dcom.sun.aas.instanceName=server
-Dcom.sun.aas.processLauncher=SE
-Dcom.sun.aas.promptForIdentity=true
-Dcom.sun.enterprise.config.config_environment_factory_class=com.sun.enterprise.config.serverbeans.AppserverConfigEnvironmentFactory
-Dcom.sun.enterprise.overrideablejavaxpackages=javax.help,javax.portlet
-Dcom.sun.enterprise.taglibs=appserv-jstl.jar,jsf-impl.jar
-Dcom.sun.enterprise.taglisteners=jsf-impl.jar
-Dcom.sun.updatecenter.home=C:/Program Files/glassfish-v2ur2/updatecenter
-Ddomain.name=domain1
-Djava.endorsed.dirs=C:/Program Files/glassfish-v2ur2/lib/endorsed
-Djava.ext.dirs=C:/Program Files/Java/jdk1.6.0_02/lib/ext;C:/Program Files/Java/jdk1.6.0_02/jre/lib/ext;C:/Program Files/glassfish-v2ur2/domains/domain1/lib/ext;C:/Program Files/glassfish-v2ur2/javadb/lib
-Djava.library.path=C:\Program Files\glassfish-v2ur2\lib;C:\Program Files\glassfish-v2ur2\lib;C:\Program Files\glassfish-v2ur2\bin;C:\Program Files\glassfish-v2ur2\lib
-Djava.security.auth.login.config=C:/Program Files/glassfish-v2ur2/domains/domain1/config/login.conf
-Djava.security.policy=C:/Program Files/glassfish-v2ur2/domains/domain1/config/server.policy
-Djava.util.logging.manager=com.sun.enterprise.server.logging.ServerLogManager
-Djavax.management.builder.initial=com.sun.enterprise.admin.server.core.jmx.AppServerMBeanServerBuilder
-Djavax.net.ssl.keyStore=C:/Program Files/glassfish-v2ur2/domains/domain1/config/keystore.jks
-Djavax.net.ssl.trustStore=C:/Program Files/glassfish-v2ur2/domains/domain1/config/cacerts.jks
-Djdbc.drivers=org.apache.derby.jdbc.ClientDriver
-Djmx.invoke.getters=true
-Dsun.rmi.dgc.client.gcInterval=3600000
-Dsun.rmi.dgc.server.gcInterval=3600000
-client
-XX:+UnlockDiagnosticVMOptions
-XX:MaxPermSize=192m
-Xmx512m
-XX:NewRatio=2
-XX:+LogVMOutput
-XX:LogFile=C:/Program Files/glassfish-v2ur2/domains/domain1/logs/jvm.log
-cp
C:/Program Files/glassfish-v2ur2/lib/jhall.jar;C:\Program Files\glassfish-v2ur2\lib\appserv-launch.jar
com.sun.enterprise.server.PELaunch
start
[#|2009-02-12T01:06:07.656+0100|INFO|sun-appserver9.1|javax.enterprise.system.core|_ThreadID=10;_ThreadName=main;|Démarrage de Sun Java System Application Server 9.1_02 (build b04-fcs)...|#]
 
[#|2009-02-12T01:06:07.828+0100|INFO|sun-appserver9.1|javax.enterprise.system.core|_ThreadID=11;_ThreadName=pool-1-thread-2;com.sun.enterprise.interceptor.DynamicInterceptor;|MBeanServer démarré : com.sun.enterprise.interceptor.DynamicInterceptor|#]
 
[#|2009-02-12T01:06:08.656+0100|INFO|sun-appserver9.1|javax.enterprise.system.core|_ThreadID=10;_ThreadName=main;|CORE5098 : L'initialisation du service AS Socket est terminée.|#]
 
[#|2009-02-12T01:06:08.687+0100|INFO|sun-appserver9.1|javax.enterprise.system.core|_ThreadID=10;_ThreadName=main;Java HotSpot(TM) Client VM;1.6.0_02;Sun Microsystems Inc.;|CORE5076 : Utilisation de [Java HotSpot(TM) Client VM, version 1.6.0_02] de [Sun Microsystems Inc.]|#]
 
[#|2009-02-12T01:06:08.718+0100|INFO|sun-appserver9.1|javax.enterprise.system.core.security|_ThreadID=10;_ThreadName=main;|SEC1002 : Le Gestionnaire de sécurité est DÉSACTIVÉ.|#]
 
[#|2009-02-12T01:06:09.546+0100|INFO|sun-appserver9.1|javax.enterprise.system.stream.out|_ThreadID=10;_ThreadName=main;|C:/Program Files/glassfish-v2ur2/domains/domain1/config/.__com_sun_appserv_pid|#]
 
[#|2009-02-12T01:06:09.765+0100|INFO|sun-appserver9.1|javax.enterprise.system.tools.admin|_ThreadID=10;_ThreadName=main;|ADM0001 : SunoneInterceptor est à présent activé|#]
 
[#|2009-02-12T01:06:09.921+0100|INFO|sun-appserver9.1|javax.enterprise.system.core.security|_ThreadID=10;_ThreadName=main;com.sun.enterprise.security.provider.PolicyWrapper;|SEC1143 : Chargement du fournisseur de la stratégie com.sun.enterprise.security.provider.PolicyWrapper.|#]
 
[#|2009-02-12T01:06:10.515+0100|INFO|sun-appserver9.1|javax.enterprise.system.container.web|_ThreadID=10;_ThreadName=main;server;|WEB0114 : SSO est désactivé sur le serveur virtuel [server]|#]
 
[#|2009-02-12T01:06:10.531+0100|INFO|sun-appserver9.1|javax.enterprise.system.container.web|_ThreadID=10;_ThreadName=main;__asadmin;|WEB0114 : SSO est désactivé sur le serveur virtuel [__asadmin]|#]
 
[#|2009-02-12T01:06:11.140+0100|INFO|sun-appserver9.1|javax.enterprise.system.tools.admin|_ThreadID=10;_ThreadName=main;|ADM1079 : Initialisation de MBeans AMX démarrée|#]
 
[#|2009-02-12T01:06:11.578+0100|INFO|sun-appserver9.1|javax.enterprise.system.tools.admin|_ThreadID=12;_ThreadName=Thread-16;service:jmx:rmi:///jndi/rmi://Port_Mathieu:8686/jmxrmi;|ADM1504 : JMXServiceURL pour le serveur JMXConnectorServer standard : [service:jmx:rmi:///jndi/rmi://Port_Mathieu:8686/jmxrmi]. Il s'agit de l'URL que les clients administrateurs distants doivent utiliser pour se connecter à l'aide des connecteurs JMX standard.|#]
 
[#|2009-02-12T01:06:11.578+0100|INFO|sun-appserver9.1|javax.enterprise.system.tools.admin|_ThreadID=12;_ThreadName=Thread-16;true;|ADM1506 : État du connecteur JMX standard : Actif = [true]|#]
 
[#|2009-02-12T01:06:12.750+0100|INFO|sun-appserver9.1|com.sun.jbi.framework|_ThreadID=13;_ThreadName=pool-1-thread-3;|JBIFW0010: JBI framework ready to accept requests.|#]
 
[#|2009-02-12T01:06:13.468+0100|INFO|sun-appserver9.1|javax.enterprise.system.container.ejb|_ThreadID=10;_ThreadName=main;|EJBSCLookup:: sc.getEjbContainerAvailabilityEnabledFromConfig() ==> false|#]
 
[#|2009-02-12T01:06:14.406+0100|INFO|sun-appserver9.1|javax.enterprise.system.core.transaction|_ThreadID=10;_ThreadName=main;3700;|JTS5014 : Instance JTS récupérable, serverId = [3700]|#]
 
[#|2009-02-12T01:06:14.453+0100|INFO|sun-appserver9.1|javax.enterprise.system.core|_ThreadID=10;_ThreadName=main;|About to load the system app: MEjbApp|#]
 
[#|2009-02-12T01:06:14.671+0100|INFO|sun-appserver9.1|javax.enterprise.resource.corba|_ThreadID=10;_ThreadName=main;|POARemoteRefFactory checking if SFSBVersionPolicy need to be added|#]
 
[#|2009-02-12T01:06:14.671+0100|INFO|sun-appserver9.1|javax.enterprise.system.container.ejb|_ThreadID=10;_ThreadName=main;|EJBSCLookup:: sc.getEjbContainerAvailabilityEnabledFromConfig() ==> false|#]
 
[#|2009-02-12T01:06:14.671+0100|INFO|sun-appserver9.1|javax.enterprise.resource.corba|_ThreadID=10;_ThreadName=main;|POARemoteRefFactory addSFSBVersionPolicy? false|#]
 
[#|2009-02-12T01:06:14.671+0100|INFO|sun-appserver9.1|javax.enterprise.resource.corba|_ThreadID=10;_ThreadName=main;|POARemoteRefFactory checking if SFSBVersionPolicy need to be added|#]
 
[#|2009-02-12T01:06:14.671+0100|INFO|sun-appserver9.1|javax.enterprise.system.container.ejb|_ThreadID=10;_ThreadName=main;|EJBSCLookup:: sc.getEjbContainerAvailabilityEnabledFromConfig() ==> false|#]
 
[#|2009-02-12T01:06:14.671+0100|INFO|sun-appserver9.1|javax.enterprise.resource.corba|_ThreadID=10;_ThreadName=main;|POARemoteRefFactory addSFSBVersionPolicy? false|#]
 
[#|2009-02-12T01:06:14.812+0100|INFO|sun-appserver9.1|javax.enterprise.system.core.classloading|_ThreadID=10;_ThreadName=main;MEjbApp;|LDR5010 : Tous les ejb de [MEjbApp] chargés avec succès !|#]
 
[#|2009-02-12T01:06:14.828+0100|INFO|sun-appserver9.1|javax.enterprise.system.core|_ThreadID=10;_ThreadName=main;|About to load the system app: __ejb_container_timer_app|#]
 
[#|2009-02-12T01:06:15.328+0100|INFO|sun-appserver9.1|javax.enterprise.system.container.ejb|_ThreadID=10;_ThreadName=main;jdbc/__TimerPool;|EJB5109 : Le démarrage du service d'horloge EJB a été correctement effectué pour la source de données [jdbc/__TimerPool].|#]
 
[#|2009-02-12T01:06:15.328+0100|INFO|sun-appserver9.1|javax.enterprise.system.core.classloading|_ThreadID=10;_ThreadName=main;__ejb_container_timer_app;|LDR5010 : Tous les ejb de [__ejb_container_timer_app] chargés avec succès !|#]
 
[#|2009-02-12T01:06:16.046+0100|INFO|sun-appserver9.1|javax.enterprise.system.core.naming|_ThreadID=10;_ThreadName=main;java:comp/env/bean.AccesPersonneBean/em;|naming.bind|#]
 
[#|2009-02-12T01:06:16.062+0100|INFO|sun-appserver9.1|javax.enterprise.system.core.classloading|_ThreadID=10;_ThreadName=main;App1;|LDR5010 : Tous les ejb de [App1] chargés avec succès !|#]
 
[#|2009-02-12T01:06:16.078+0100|INFO|sun-appserver9.1|javax.enterprise.system.container.web|_ThreadID=10;_ThreadName=main;|WEB0302 : Démarrage de Sun Java System/Application Server|#]
 
[#|2009-02-12T01:06:16.640+0100|INFO|sun-appserver9.1|javax.enterprise.system.container.web|_ThreadID=10;_ThreadName=main;8080;|WEB0712 : Démarrage de Sun-Java-System/Application-Server HTTP/1.1 sur 8080|#]
 
[#|2009-02-12T01:06:16.718+0100|INFO|sun-appserver9.1|javax.enterprise.system.container.web|_ThreadID=10;_ThreadName=main;8181;|WEB0712 : Démarrage de Sun-Java-System/Application-Server HTTP/1.1 sur 8181|#]
 
[#|2009-02-12T01:06:16.750+0100|INFO|sun-appserver9.1|javax.enterprise.system.container.web|_ThreadID=10;_ThreadName=main;4848;|WEB0712 : Démarrage de Sun-Java-System/Application-Server HTTP/1.1 sur 4848|#]
 
[#|2009-02-12T01:06:17.687+0100|INFO|sun-appserver9.1|javax.enterprise.system.core.selfmanagement|_ThreadID=10;_ThreadName=main;|SMGT0007 : Le service de règles de gestion automatique est activé|#]
 
[#|2009-02-12T01:06:17.718+0100|INFO|sun-appserver9.1|javax.enterprise.system.core|_ThreadID=10;_ThreadName=main;|Démarrage du serveur d'applications terminé.|#]
 
[#|2009-02-12T01:06:28.671+0100|SEVERE|sun-appserver9.1|javax.enterprise.system.container.web|_ThreadID=14;_ThreadName=httpSSLWorkerThread-8080-1;_RequestID=0db76b47-5af3-4373-89e3-09141114dcb2;|StandardWrapperValve[jsp]: PWC1406 : servlet.service() pour le servlet jsp a émis une exception.
java.lang.NullPointerException
	at bean.AccesPersonneBean.getPrenom(AccesPersonneBean.java:27)
	at org.apache.jsp.traitement_jsp._jspService(traitement_jsp.java from :73)
	at org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:93)
	at javax.servlet.http.HttpServlet.service(HttpServlet.java:831)
	at org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:373)
	at org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:470)
	at org.apache.jasper.servlet.JspServlet.service(JspServlet.java:364)
	at javax.servlet.http.HttpServlet.service(HttpServlet.java:831)
	at org.apache.catalina.core.ApplicationFilterChain.servletService(ApplicationFilterChain.java:411)
	at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:290)
	at org.apache.catalina.core.StandardContextValve.invokeInternal(StandardContextValve.java:271)
	at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:202)
	at org.apache.catalina.core.StandardPipeline.doInvoke(StandardPipeline.java:632)
	at org.apache.catalina.core.StandardPipeline.doInvoke(StandardPipeline.java:577)
	at com.sun.enterprise.web.WebPipeline.invoke(WebPipeline.java:94)
	at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:206)
	at org.apache.catalina.core.StandardPipeline.doInvoke(StandardPipeline.java:632)
	at org.apache.catalina.core.StandardPipeline.doInvoke(StandardPipeline.java:577)
	at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:571)
	at org.apache.catalina.core.ContainerBase.invoke(ContainerBase.java:1080)
	at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:150)
	at org.apache.catalina.core.StandardPipeline.doInvoke(StandardPipeline.java:632)
	at org.apache.catalina.core.StandardPipeline.doInvoke(StandardPipeline.java:577)
	at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:571)
	at org.apache.catalina.core.ContainerBase.invoke(ContainerBase.java:1080)
	at org.apache.coyote.tomcat5.CoyoteAdapter.service(CoyoteAdapter.java:272)
	at com.sun.enterprise.web.connector.grizzly.DefaultProcessorTask.invokeAdapter(DefaultProcessorTask.java:637)
	at com.sun.enterprise.web.connector.grizzly.DefaultProcessorTask.doProcess(DefaultProcessorTask.java:568)
	at com.sun.enterprise.web.connector.grizzly.DefaultProcessorTask.process(DefaultProcessorTask.java:813)
	at com.sun.enterprise.web.connector.grizzly.DefaultReadTask.executeProcessorTask(DefaultReadTask.java:341)
	at com.sun.enterprise.web.connector.grizzly.DefaultReadTask.doTask(DefaultReadTask.java:263)
	at com.sun.enterprise.web.connector.grizzly.DefaultReadTask.doTask(DefaultReadTask.java:214)
	at com.sun.enterprise.web.connector.grizzly.TaskBase.run(TaskBase.java:265)
	at com.sun.enterprise.web.connector.grizzly.ssl.SSLWorkerThread.run(SSLWorkerThread.java:106)
|#]

Si vous pouviez m'aider.
Merci
Mathieu