[HIBERNATE] Error getting Hibernate Session Factory

Bonjour à tous,

J'ai voulu tester une application web de messagerie écrite avec icefaces et hibernate. Au démarrage j'ai le msg d'erreur suivant:

Code:

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ERROR - Error getting Hibernate Session Factory  - com.icesoft.applications.faces.webmail.util.db.HibernateUtil  
java.lang.IllegalAccessError: tried to access field org.slf4j.impl.StaticLoggerBinder.SINGLETON from class org.slf4j.LoggerFactory
	at org.slf4j.LoggerFactory.<clinit>(LoggerFactory.java:60)
	at org.hibernate.cfg.Configuration.<clinit>(Configuration.java:151)
	at com.icesoft.applications.faces.webmail.util.db.HibernateUtil.<clinit>(HibernateUtil.java:60)
	at com.icesoft.applications.faces.webmail.WebmailMediator.<init>(WebmailMediator.java:80)
	at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
	at sun.reflect.NativeConstructorAccessorImpl.newInstance(Unknown Source)
	at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(Unknown Source)
	at java.lang.reflect.Constructor.newInstance(Unknown Source)
	at java.lang.Class.newInstance0(Unknown Source)
	at java.lang.Class.newInstance(Unknown Source)
	at org.apache.catalina.core.StandardContext.listenerStart(StandardContext.java:3787)
	at org.apache.catalina.core.StandardContext.start(StandardContext.java:4342)
	at org.apache.catalina.core.ContainerBase.addChildInternal(ContainerBase.java:791)
	at org.apache.catalina.core.ContainerBase.addChild(ContainerBase.java:771)
	at org.apache.catalina.core.StandardHost.addChild(StandardHost.java:525)
	at org.apache.catalina.startup.HostConfig.deployDirectory(HostConfig.java:926)
	at org.apache.catalina.startup.HostConfig.deployDirectories(HostConfig.java:889)
	at org.apache.catalina.startup.HostConfig.deployApps(HostConfig.java:492)
	at org.apache.catalina.startup.HostConfig.start(HostConfig.java:1149)
	at org.apache.catalina.startup.HostConfig.lifecycleEvent(HostConfig.java:311)
	at org.apache.catalina.util.LifecycleSupport.fireLifecycleEvent(LifecycleSupport.java:117)
	at org.apache.catalina.core.ContainerBase.start(ContainerBase.java:1053)
	at org.apache.catalina.core.StandardHost.start(StandardHost.java:719)
	at org.apache.catalina.core.ContainerBase.start(ContainerBase.java:1045)
	at org.apache.catalina.core.StandardEngine.start(StandardEngine.java:443)
	at org.apache.catalina.core.StandardService.start(StandardService.java:516)
	at org.apache.catalina.core.StandardServer.start(StandardServer.java:710)
	at org.apache.catalina.startup.Catalina.start(Catalina.java:578)
	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.catalina.startup.Bootstrap.start(Bootstrap.java:288)
	at org.apache.catalina.startup.Bootstrap.main(Bootstrap.java:413)

J'ai vérifié dans des forums et d'après certains il s'agit d'un problème de compatibilité entre certaines archives (jar)

voici la liste des jars installés au niveau de WEB-INF\lib de l'application.

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activation.jar
antlr-2.7.6.jar
asm-3.1.jar
backport-util-concurrent.jar
c3p0-0.9.1.jar
commons-beanutils.jar
commons-collections-3.1.jar
commons-collections.jar
commons-digester.jar
commons-discovery.jar
commons-el.jar
commons-fileupload.jar
commons-logging.jar
dom4j-1.6.1.jar
dsn.jar
ehcache-1.2.3.jar
hibernate-testing.jar
hibernate3.jar
icefaces-comps.jar
icefaces-facelets.jar
icefaces.jar
imap.jar
jasper-compiler.jar
javassist-3.4.GA.jar
jetty-util-6.0.1.jar
jms.jar
jsf-api-1.2.jar
jsf-impl-1.2.jar
jstl.jar
jta-1.1.jar
krysalis-jCharts-1.0.0-alpha-1.jar
log4j-1.2.15.jar
mailapi.jar
pop3.jar
servlet-api.jar
slf4j-api-1.5.2.jar
slf4j-simple-1.5.6.jar
smtp.jar

J'espère que quelqu'un puisse m'aider.