migrer myfaces 1.2.2 to JSF RI 1.2

bonjour,

je souhaiterais tester le comportement d'une application (myfaces 1.2.2,facelets 1.1.14,Richfaces 3.2,tomcat 5.5) avec l'implementation de JSF RI, version 1.2_07.

jutilise quelques composants tomahawk, j'ai lu que c'est possible d'utiliser tomahawk avec JSF RI.
mais, tomcat ne deploit l'aplication à cause de l'erreur:

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- Error reading tld listeners java.lang.NullPointerException
java.lang.NullPointerException
	at org.apache.log4j.Category.isEnabledFor(Category.java:746)
	at org.apache.commons.logging.impl.Log4JLogger.isTraceEnabled(Log4JLogger.java:327)
	at org.apache.catalina.startup.TldConfig.tldScanResourcePaths(TldConfig.java:582)
	at org.apache.catalina.startup.TldConfig.execute(TldConfig.java:283)
	at org.apache.catalina.core.StandardContext.processTlds(StandardContext.java:4307)
	at org.apache.catalina.core.StandardContext.start(StandardContext.java:4144)
	at org.apache.catalina.core.ContainerBase.addChildInternal(ContainerBase.java:760)
	at org.apache.catalina.core.ContainerBase.addChild(ContainerBase.java:740)
	at org.apache.catalina.core.StandardHost.addChild(StandardHost.java:544)
	at org.apache.catalina.startup.HostConfig.deployDirectory(HostConfig.java:920)
	at org.apache.catalina.startup.HostConfig.deployDirectories(HostConfig.java:883)
	at org.apache.catalina.startup.HostConfig.deployApps(HostConfig.java:492)
	at org.apache.catalina.startup.HostConfig.start(HostConfig.java:1138)
	at org.apache.catalina.startup.HostConfig.lifecycleEvent(HostConfig.java:311)
	at org.apache.catalina.util.LifecycleSupport.fireLifecycleEvent(LifecycleSupport.java:120)
	at org.apache.catalina.core.ContainerBase.start(ContainerBase.java:1022)
	at org.apache.catalina.core.StandardHost.start(StandardHost.java:736)
	at org.apache.catalina.core.ContainerBase.start(ContainerBase.java:1014)
	at org.apache.catalina.core.StandardEngine.start(StandardEngine.java:443)
	at org.apache.catalina.core.StandardService.start(StandardService.java:448)
	at org.apache.catalina.core.StandardServer.start(StandardServer.java:700)
	at org.apache.catalina.startup.Catalina.start(Catalina.java:552)
	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:295)
	at org.apache.catalina.startup.Bootstrap.main(Bootstrap.java:433)

qulequ'un connait ce probleme.?

merci