EJB3 Relation ManyToMany

Bonjour,

Je suis débutant en Java et je dois modéliser une relation entre deux objets User et Client. Le principe est simple, un utilisateur peut gérer plusieurs clients et un client peut être géré par plusieurs utilisateurs.

Est-ce que je dois créer une relation via l'annotation @ManyToMany ou utiliser deux relations @ManyToOne vers une classe intermédiaire CliUser par exemple.

J'ai essayé d'ajouter ces annotations dans ma classe User :

Code:

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@ManyToMany @JoinTable(name="cliuser", joinColumns = {@JoinColumn(name = "login", referencedColumnName="login")}, inverseJoinColumns = {@JoinColumn(name = "icli", referencedColumnName="icli")} ) private Collection<Client> clients;

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Mais lorsque je veux faire un merge sur le client dont la liste d'User a été modifiée, j'obtiens une EJBException caused by NullPointerException at registerObjectForMergeCloneIntoWorkingCopy.

J'ai réussi à créer mon association Many-To-Many et à en comprendre le fonctionnement et les annotations. Lorsque je sélectionne (via une interface flex) les User, je récupère bien la liste des Clients associés.

Par contre lorsque je veux faire un merge sur le User, que je l'aie modifié ou pas j'ai l'erreur suivante :

Citation:

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javax.ejb.EJBException
at com.sun.ejb.containers.BaseContainer.processSystemException(BaseContainer.java:3869)
at com.sun.ejb.containers.BaseContainer.completeNewTx(BaseContainer.java:3769)
at com.sun.ejb.containers.BaseContainer.postInvokeTx(BaseContainer.java:3571)
at com.sun.ejb.containers.BaseContainer.postInvoke(BaseContainer.java:1354)
at com.sun.ejb.containers.BaseContainer.postInvoke(BaseContainer.java:1316)
at com.sun.ejb.containers.EJBLocalObjectInvocationHandler.invoke(EJBLocalObjectInvocationHandler.java:205)
at com.sun.ejb.containers.EJBLocalObjectInvocationHandlerDelegate.invoke(EJBLocalObjectInvocationHandlerDelegate.java:127)
at $Proxy83.edit(Unknown Source)
at net.astek.astekcontacts.UserEJB.update(UserEJB.java:42)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
at java.lang.reflect.Method.invoke(Method.java:585)
at flex.messaging.services.remoting.adapters.JavaAdapter.invoke(JavaAdapter.java:406)
at flex.messaging.services.RemotingService.serviceMessage(RemotingService.java:183)
at flex.messaging.MessageBroker.routeMessageToService(MessageBroker.java:1417)
at flex.messaging.endpoints.AbstractEndpoint.serviceMessage(AbstractEndpoint.java:878)
at flex.messaging.endpoints.amf.MessageBrokerFilter.invoke(MessageBrokerFilter.java:121)
at flex.messaging.endpoints.amf.LegacyFilter.invoke(LegacyFilter.java:158)
at flex.messaging.endpoints.amf.SessionFilter.invoke(SessionFilter.java:49)
at flex.messaging.endpoints.amf.BatchProcessFilter.invoke(BatchProcessFilter.java:67)
at flex.messaging.endpoints.amf.SerializationFilter.invoke(SerializationFilter.java:146)
at flex.messaging.endpoints.BaseHTTPEndpoint.service(BaseHTTPEndpoint.java:274)
at flex.messaging.MessageBrokerServlet.service(MessageBrokerServlet.java:377)
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)
Caused by: java.lang.NullPointerException
at oracle.toplink.essentials.internal.sessions.MergeManager.registerObjectForMergeCloneIntoWorkingCopy(MergeManager.java:670)
at oracle.toplink.essentials.internal.sessions.MergeManager.mergeChangesOfCloneIntoWorkingCopy(MergeManager.java:411)
at oracle.toplink.essentials.internal.sessions.MergeManager.mergeChanges(MergeManager.java:264)
at oracle.toplink.essentials.mappings.CollectionMapping.mergeIntoObject(CollectionMapping.java:783)
at oracle.toplink.essentials.internal.descriptors.ObjectBuilder.mergeIntoObject(ObjectBuilder.java:2152)
at oracle.toplink.essentials.internal.sessions.MergeManager.mergeChangesOfCloneIntoWorkingCopy(MergeManager.java:442)
at oracle.toplink.essentials.internal.sessions.MergeManager.mergeChanges(MergeManager.java:264)
at oracle.toplink.essentials.internal.sessions.UnitOfWorkImpl.mergeCloneWithReferences(UnitOfWorkImpl.java:2723)
at oracle.toplink.essentials.internal.ejb.cmp3.base.RepeatableWriteUnitOfWork.mergeCloneWithReferences(RepeatableWriteUnitOfWork.java:219)
at oracle.toplink.essentials.internal.ejb.cmp3.base.EntityManagerImpl.mergeInternal(EntityManagerImpl.java:235)
at oracle.toplink.essentials.internal.ejb.cmp3.EntityManagerImpl.merge(EntityManagerImpl.java:128)
at com.sun.enterprise.util.EntityManagerWrapper.merge(EntityManagerWrapper.java:476)
at com.jyb.astekrefs.ejb.UserBean.edit(UserBean.java:40)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
at java.lang.reflect.Method.invoke(Method.java:585)
at com.sun.enterprise.security.application.EJBSecurityManager.runMethod(EJBSecurityManager.java:1067)
at com.sun.enterprise.security.SecurityUtil.invoke(SecurityUtil.java:176)
at com.sun.ejb.containers.BaseContainer.invokeTargetBeanMethod(BaseContainer.java:2895)
at com.sun.ejb.containers.BaseContainer.intercept(BaseContainer.java:3986)
at com.sun.ejb.containers.EJBLocalObjectInvocationHandler.invoke(EJBLocalObjectInvocationHandler.java:197)
... 45 more

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Je précise que je travaille avec :
- EJB : EJB 3
- Serveur : GlassFish V2
- BDD : MySql 5
- Interface : Flex 3