I have problem starting tomcat now that I have installed macos lion.
I get the following error in catalina.out :

Aug 7, 2011 4:12:01 AM org.apache.catalina.core.AprLifecycleListener init
INFO: Loaded APR based Apache Tomcat Native library 1.1.20.
Aug 7, 2011 4:12:01 AM org.apache.catalina.core.AprLifecycleListener init
INFO: APR capabilities: IPv6 [true], sendfile [true], accept filters [false], random [true].
java.lang.NoClassDefFoundError: javax/servlet/SessionTrackingMode
	at org.apache.catalina.connector.Connector.initInternal(Connector.java:902)
	at org.apache.catalina.util.LifecycleBase.init(LifecycleBase.java:101)
	at org.apache.catalina.core.StandardService.initInternal(StandardService.java:559)
	at org.apache.catalina.util.LifecycleBase.init(LifecycleBase.java:101)
	at org.apache.catalina.core.StandardServer.initInternal(StandardServer.java:780)
	at org.apache.catalina.util.LifecycleBase.init(LifecycleBase.java:101)
	at org.apache.catalina.startup.Catalina.load(Catalina.java:572)
	at org.apache.catalina.startup.Catalina.load(Catalina.java:595)
	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:597)
	at org.apache.catalina.startup.Bootstrap.load(Bootstrap.java:262)
	at org.apache.catalina.startup.Bootstrap.main(Bootstrap.java:430)
Caused by: java.lang.ClassNotFoundException: javax.servlet.SessionTrackingMode
	at java.net.URLClassLoader$1.run(URLClassLoader.java:202)
	at java.security.AccessController.doPrivileged(Native Method)
	at java.net.URLClassLoader.findClass(URLClassLoader.java:190)
	at java.lang.ClassLoader.loadClass(ClassLoader.java:306)
	at java.lang.ClassLoader.loadClass(ClassLoader.java:247)
	... 14 more

Any ideas?
Thank you.

I just reinstalled latest version of Tomcat and now it works!

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