bonjour,
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21 mars 2011 12:58:25 org.apache.catalina.core.StandardWrapperValve invoke
GRAVE: "Servlet.service()" pour la servlet DefaultIndex a généré une exception
java.lang.NoClassDefFoundError: javax/persistence/EntityListeners
	at org.hibernate.cfg.annotations.reflection.JPAMetadataProvider.getDefaults(JPAMetadataProvider.java:96)
	at org.hibernate.annotations.common.reflection.java.JavaReflectionManager.getDefaults(JavaReflectionManager.java:226)
	at org.hibernate.cfg.Configuration.secondPassCompile(Configuration.java:1355)
	at org.hibernate.cfg.Configuration.buildSessionFactory(Configuration.java:1826)
	at org.openmeetings.app.hibernate.utils.HibernateUtil.getSessionFactory(HibernateUtil.java:77)
	at org.openmeetings.app.hibernate.utils.HibernateUtil.createSession(HibernateUtil.java:35)
	at org.openmeetings.app.data.basic.Configurationmanagement.getConfKey(Configurationmanagement.java:50)
	at org.openmeetings.servlet.outputhandler.DefaultIndex.handleRequest(DefaultIndex.java:35)
	at org.apache.velocity.tools.view.servlet.VelocityViewServlet.doRequest(VelocityViewServlet.java:541)
	at org.apache.velocity.tools.view.servlet.VelocityViewServlet.doGet(VelocityViewServlet.java:507)
	at javax.servlet.http.HttpServlet.service(HttpServlet.java:617)
	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.StandardWrapperValve.invoke(StandardWrapperValve.java:233)
	at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:191)
	at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:470)
	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:298)
	at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:857)
	at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(Http11Protocol.java:588)
	at org.apache.tomcat.util.net.JIoEndpoint$Worker.run(JIoEndpoint.java:489)
	at java.lang.Thread.run(Thread.java:636)


a noter que j'ai hibernate-jpa-2.0-api-1.0.0.Final.jar dans le claspath, je vois pas d'ou vient l'erreur
s'il vous plait aider moi!!!!!!!!!!!!