Discussion :

[tomy29]

Bonjour,

J'ai un soucis de communication entre mon Projet Web(JSF) et mon Projet EJB. Lors de l'appel , coté web, d'une méthode coté EJB, l'objet passé en paramètre est apparemment "null".

Du côté EJB :

Code :

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package com.ejb.IEJBSession;
 
import java.util.List;
import javax.ejb.Local;
import javax.ejb.Remote;
import com.ejb.entities.Wine;
 
@Local
public interface IWineSession {
	public void add(Wine wine);
	public void delete(Wine wine);
	public List<Wine> showListOfWines();
}

Code :

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package com.ejb.EJBSession;
 
import java.util.List;
import javax.ejb.Stateless;
import javax.persistence.EntityManager;
import javax.persistence.PersistenceContext;
import javax.persistence.Query;
import com.ejb.IEJBSession.IWineSession;
import com.ejb.entities.Wine;
 
 
@Stateless
 
public class WineSession implements IWineSession {
	@PersistenceContext(unitName="WineCaveEJB")
 
	private EntityManager em;
 
	public void add(Wine wine) {
		// TODO Auto-generated method stub
			em.persist(wine);		
	}
 
	public void delete(Wine wine){
		wine = em.merge(wine);
		em.remove(wine);
	}
 
 
	public List<Wine> showListOfWines() {
		// TODO Auto-generated method stub
		Query query = em.createNamedQuery("wineList");
		List<Wine> wineList = query.getResultList();
 
 
		return wineList;
	}
 
}

Code :

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package com.ejb.entities;
 
import java.io.Serializable;
import javax.persistence.Entity;
import javax.persistence.Id;
import javax.persistence.NamedQueries;
import javax.persistence.NamedQuery;
 
@Entity
@NamedQueries({
	@NamedQuery(name ="wineList", query = "SELECT w from Wine w")
				})
 
	public class Wine implements Serializable{
 
		private static final long serialVersionUID = -4335426208843293310L;
 
 
			@Id
			private Integer id;
 
			private String name;
 
			public Wine(){};
			public Wine(Integer id, String name){
				this.id=id;
				this.name=name;
			}
 
			public Integer getId() {
				return id;
			}
			public void setId(Integer id) {
				this.id = id;
			}
			public String getName() {
				return name;
			}
			public void setName(String name) {
				this.name = name;
			}
}

Coté client j'ai mon managed bean que je souhaite tester :

Code :

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package com.bean;
 
import javax.ejb.EJB;
 
import com.ejb.EJBSession.WineSession;
import com.ejb.IEJBSession.IWineSession;
import com.ejb.entities.Wine;
 
public class WineBean {
 
	@EJB
	private IWineSession wineSession;
 
	Wine currentWine;
 
	public WineBean(){setCurrentWine(new Wine());}
 
	public String addWine(){
		Wine wine = new Wine(1,"Bordeaux");
		wineSession.add(wine);
		System.out.println("Vin ajouté");
		return "addedWine";
	}
 
	public Wine getCurrentWine(){
		return currentWine;
	}
 
	public void setCurrentWine(Wine wine){
		this.currentWine=wine;
	}
}

Quand j'exécute le projet, j'ai une erreur quand il appelle la methode wineSession.addWine(wine)

Voici l'erreur :

java.lang.NullPointerException
at com.bean.WineBean.addWine(WineBean.java:40)
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.apache.el.parser.AstValue.invoke(AstValue.java:170)
at org.apache.el.MethodExpressionImpl.invoke(MethodExpressionImpl.java:276)
at org.apache.jasper.el.JspMethodExpression.invoke(JspMethodExpression.java:68)
at javax.faces.component.MethodBindingMethodExpressionAdapter.invoke(MethodBindingMethodExpressionAdapter.java:88)
at com.sun.faces.application.ActionListenerImpl.processAction(ActionListenerImpl.java:102)
at javax.faces.component.UICommand.broadcast(UICommand.java:387)
at javax.faces.component.UIViewRoot.broadcastEvents(UIViewRoot.java:475)
at javax.faces.component.UIViewRoot.processApplication(UIViewRoot.java:756)
at com.sun.faces.lifecycle.InvokeApplicationPhase.execute(InvokeApplicationPhase.java:82)
at com.sun.faces.lifecycle.Phase.doPhase(Phase.java:100)
at com.sun.faces.lifecycle.LifecycleImpl.execute(LifecycleImpl.java:118)
at javax.faces.webapp.FacesServlet.service(FacesServlet.java:265)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:290)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
at org.jboss.web.tomcat.filters.ReplyHeaderFilter.doFilter(ReplyHeaderFilter.java:96)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:235)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:235)
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:191)
at org.jboss.web.tomcat.security.SecurityAssociationValve.invoke(SecurityAssociationValve.java:190)
at org.jboss.web.tomcat.security.JaccContextValve.invoke(JaccContextValve.java:92)
at org.jboss.web.tomcat.security.SecurityContextEstablishmentValve.process(SecurityContextEstablishmentValve.java:126)
at org.jboss.web.tomcat.security.SecurityContextEstablishmentValve.invoke(SecurityContextEstablishmentValve.java:70)
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:127)
at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:102)
at org.jboss.web.tomcat.service.jca.CachedConnectionValve.invoke(CachedConnectionValve.java:158)
at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:109)
at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:330)
at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:829)
at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(Http11Protocol.java:598)
at org.apache.tomcat.util.net.JIoEndpoint$Worker.run(JIoEndpoint.java:447)
at java.lang.Thread.run(Unknown Source)

Apparemment l'objet Wine ne passe pas d'un projet à l'autre.

Merci d'avance pour votre aide.

[tomy29]

J'ai résolu le problème en remplaçant @EJB par @EJB(mappedName="WineSession/local")