Problemas com o tomcat no WTP

Olá Pessoal!

Estou com a seguinte dúvida:

No Eclipse Web Tools quando tento subir uma aplicação no tomcat 6 recebo a seguinte a mensagem:

17/10/2010 19:28:05 org.apache.catalina.core.AprLifecycleListener lifecycleEvent
INFO: The Apache Tomcat Native library which allows optimal performance in production environments was not found on the java.library.path: C:\Program Files\Java\jre6\bin;.;C:\Windows\Sun\Java\bin;C:\Windows\system32;C:\Windows;C:/Program Files/Java/jre6/bin/client;C:/Program Files/Java/jre6/bin;C:\Program Files\Common Files\Microsoft Shared\Windows Live;C:\Windows\system32;C:\Windows;C:\Windows\System32\Wbem;c:\Program Files\Microsoft SQL Server\90\Tools\binn;C:\Program Files\MySQL\MySQL Server 5.1\bin;C:\Program Files\Common Files\Microsoft Shared\Windows Live
17/10/2010 19:28:05 org.apache.coyote.http11.Http11Protocol init
INFO: Initializing Coyote HTTP/1.1 on http-8080
17/10/2010 19:28:05 org.apache.catalina.startup.Catalina load
INFO: Initialization processed in 480 ms
17/10/2010 19:28:05 org.apache.catalina.core.StandardService start
INFO: Starting service Catalina
17/10/2010 19:28:05 org.apache.catalina.core.StandardEngine start
INFO: Starting Servlet Engine: Apache Tomcat/6.0.0
17/10/2010 19:28:05 org.apache.catalina.core.StandardHost start
INFO: XML validation disabled
17/10/2010 19:28:05 org.apache.catalina.core.StandardContext listenerStart
SEVERE: Error configuring application listener of class org.apache.myfaces.webapp.StartupServletContextListener
java.lang.ClassNotFoundException: org.apache.myfaces.webapp.StartupServletContextListener
at org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1354)
at org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1200)
at org.apache.catalina.core.StandardContext.listenerStart(StandardContext.java:3769)
at org.apache.catalina.core.StandardContext.start(StandardContext.java:4335)
at org.apache.catalina.core.ContainerBase.start(ContainerBase.java:1013)
at org.apache.catalina.core.StandardHost.start(StandardHost.java:718)
at org.apache.catalina.core.ContainerBase.start(ContainerBase.java:1013)
at org.apache.catalina.core.StandardEngine.start(StandardEngine.java:442)
at org.apache.catalina.core.StandardService.start(StandardService.java:450)
at org.apache.catalina.core.StandardServer.start(StandardServer.java:709)
at org.apache.catalina.startup.Catalina.start(Catalina.java:551)
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:287)
at org.apache.catalina.startup.Bootstrap.main(Bootstrap.java:412)
17/10/2010 19:28:05 org.apache.catalina.core.StandardContext listenerStart
SEVERE: Skipped installing application listeners due to previous error(s)
17/10/2010 19:28:05 org.apache.catalina.core.StandardContext start
SEVERE: Error listenerStart
17/10/2010 19:28:05 org.apache.catalina.core.StandardContext start
SEVERE: Context [/saf] startup failed due to previous errors
17/10/2010 19:28:05 org.apache.coyote.http11.Http11Protocol start
INFO: Starting Coyote HTTP/1.1 on http-8080
17/10/2010 19:28:05 org.apache.jk.common.ChannelSocket init
INFO: JK: ajp13 listening on /0.0.0.0:8009
17/10/2010 19:28:05 org.apache.jk.server.JkMain start
INFO: Jk running ID=0 time=0/33 config=null
17/10/2010 19:28:05 org.apache.catalina.startup.Catalina start
INFO: Server startup in 435 ms

O problema é que as vezes quando fecho o tomcat e abro novamente a aplicação sobe sem problemas!!! Alguém poderia me ajudar? Já procurei no Google mas não consegui resolver ainda.

Obrigado!

Vc está usando qual sistema operacional?
Isso pode ser permissão de acesso aos arquivos.

Tive problema semelhante quando fui configurar o TomCat em um Windows Server 2008, pois no 2008, tudo é barrado e vc tm q liberar, conforme necessidade.

Obrigado por responder!!

To usando o vista! Estranho eu apenas fechei o projeto e abri de novo no eclipse e funcionou. Vai entender!!!

obrigado!