Nella lib di tomcat ci sono tutti i .jar che si trovano nel file di installazione. Non ho aggiunto nulla di nuovo nè eliminato qualcosa.

Credo di non aver fatto nessuna modifica al classpath di java. Come posso ricavare cosa contiene il classpath al momento dell'avvio di tomcat?

Ti posto il contenuto del file di log catalina.out tagliato in un punto perchè troppo lungo per il forum. Posso inviartelo in qualche altro modo se ti interessa.
codice:
7-mag-2011 19.10.58 org.apache.catalina.core.AprLifecycleListener init
INFO: The APR based Apache Tomcat Native library which allows optimal performance in production environments was not found on the java.library.path: .:/Library/Java/Extensions:/System/Library/Java/Extensions:/usr/lib/java
7-mag-2011 19.10.59 org.apache.coyote.AbstractProtocolHandler init
INFO: Initializing ProtocolHandler ["http-bio-8080"]
7-mag-2011 19.10.59 org.apache.coyote.AbstractProtocolHandler init
INFO: Initializing ProtocolHandler ["ajp-bio-8009"]
7-mag-2011 19.10.59 org.apache.catalina.startup.Catalina load
INFO: Initialization processed in 1434 ms
7-mag-2011 19.10.59 org.apache.catalina.core.StandardService startInternal
INFO: Starting service Catalina
7-mag-2011 19.10.59 org.apache.catalina.core.StandardEngine startInternal
INFO: Starting Servlet Engine: Apache Tomcat/7.0.12
7-mag-2011 19.10.59 org.apache.catalina.startup.HostConfig deployDirectory
INFO: Deploying web application directory docs
7-mag-2011 19.11.00 org.apache.catalina.startup.HostConfig deployDirectory
GRAVE: Error deploying web application directory docs
java.lang.NoSuchMethodError: javax.servlet.ServletContext.getResourcePaths(Ljava/lang/String;)Ljava/util/Set;
	at org.apache.tomcat.util.scan.StandardJarScanner.scan(StandardJarScanner.java:144)
	at org.apache.catalina.startup.ContextConfig.processJarsForWebFragments(ContextConfig.java:1738)
	at org.apache.catalina.startup.ContextConfig.webConfig(ContextConfig.java:1223)
	at org.apache.catalina.startup.ContextConfig.configureStart(ContextConfig.java:882)
	at org.apache.catalina.startup.ContextConfig.lifecycleEvent(ContextConfig.java:317)
	at 
		
CUT
	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
	at java.lang.reflect.Method.invoke(Method.java:597)
	at org.apache.catalina.startup.Bootstrap.start(Bootstrap.java:303)
	at org.apache.catalina.startup.Bootstrap.main(Bootstrap.java:431)
7-mag-2011 19.11.00 org.apache.catalina.startup.HostConfig deployDirectory
INFO: Deploying web application directory examples
7-mag-2011 19.11.00 org.apache.catalina.startup.HostConfig deployDirectory
GRAVE: Error deploying web application directory examples
java.lang.NoSuchMethodError: javax.servlet.ServletContext.getResourcePaths(Ljava/lang/String;)Ljava/util/Set;
	at org.apache.tomcat.util.scan.StandardJarScanner.scan(StandardJarScanner.java:144)
	at org.apache.catalina.startup.ContextConfig.processJarsForWebFragments(ContextConfig.java:1738)
	at org.apache.catalina.startup.ContextConfig.webConfig(ContextConfig.java:1223)
	at org.apache.catalina.startup.ContextConfig.configureStart(ContextConfig.java:882)
	at org.apache.catalina.startup.ContextConfig.lifecycleEvent(ContextConfig.java:317)
	at org.apache.catalina.util.LifecycleSupport.fireLifecycleEvent(LifecycleSupport.java:119)
	at org.apache.catalina.util.LifecycleBase.fireLifecycleEvent(LifecycleBase.java:89)
	at org.apache.catalina.core.StandardContext.startInternal(StandardContext.java:5081)
	at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:145)
	at org.apache.catalina.core.ContainerBase.addChildInternal(ContainerBase.java:812)
	at org.apache.catalina.core.ContainerBase.addChild(ContainerBase.java:787)
	at org.apache.catalina.core.StandardHost.addChild(StandardHost.java:607)
	at org.apache.catalina.startup.HostConfig.deployDirectory(HostConfig.java:1055)
	at org.apache.catalina.startup.HostConfig.deployDirectories(HostConfig.java:978)
	at org.apache.catalina.startup.HostConfig.deployApps(HostConfig.java:472)
	at org.apache.catalina.startup.HostConfig.start(HostConfig.java:1322)
	at org.apache.catalina.startup.HostConfig.lifecycleEvent(HostConfig.java:311)
	at org.apache.catalina.util.LifecycleSupport.fireLifecycleEvent(LifecycleSupport.java:119)
	at org.apache.catalina.util.LifecycleBase.fireLifecycleEvent(LifecycleBase.java:89)
	at org.apache.catalina.util.LifecycleBase.setStateInternal(LifecycleBase.java:379)
	at org.apache.catalina.util.LifecycleBase.setState(LifecycleBase.java:324)
	at org.apache.catalina.core.ContainerBase.startInternal(ContainerBase.java:1041)
	at org.apache.catalina.core.StandardHost.startInternal(StandardHost.java:774)
	at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:145)
	at org.apache.catalina.core.ContainerBase.startInternal(ContainerBase.java:1033)
	at org.apache.catalina.core.StandardEngine.startInternal(StandardEngine.java:291)
	at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:145)
	at org.apache.catalina.core.StandardService.startInternal(StandardService.java:443)
	at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:145)
	at org.apache.catalina.core.StandardServer.startInternal(StandardServer.java:727)
	at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:145)
	at org.apache.catalina.startup.Catalina.start(Catalina.java:620)
	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.start(Bootstrap.java:303)
	at org.apache.catalina.startup.Bootstrap.main(Bootstrap.java:431)
7-mag-2011 19.11.00 org.apache.catalina.startup.HostConfig deployDirectory
INFO: Deploying web application directory host-manager
7-mag-2011 19.11.00 org.apache.catalina.startup.HostConfig deployDirectory
GRAVE: Error deploying web application directory host-manager
java.lang.NoSuchMethodError: javax.servlet.ServletContext.getResourcePaths(Ljava/lang/String;)Ljava/util/Set;
	at org.apache.tomcat.util.scan.StandardJarScanner.scan(StandardJarScanner.java:144)
	at org.apache.catalina.startup.ContextConfig.processJarsForWebFragments(ContextConfig.java:1738)
	at org.apache.catalina.startup.ContextConfig.webConfig(ContextConfig.java:1223)
	at org.apache.catalina.startup.ContextConfig.configureStart(ContextConfig.java:882)
	at org.apache.catalina.startup.ContextConfig.lifecycleEvent(ContextConfig.java:317)
	at org.apache.catalina.util.LifecycleSupport.fireLifecycleEvent(LifecycleSupport.java:119)
	at org.apache.catalina.util.LifecycleBase.fireLifecycleEvent(LifecycleBase.java:89)
	at org.apache.catalina.core.StandardContext.startInternal(StandardContext.java:5081)
	at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:145)
	at org.apache.catalina.core.ContainerBase.addChildInternal(ContainerBase.java:812)
	at org.apache.catalina.core.ContainerBase.addChild(ContainerBase.java:787)
	at org.apache.catalina.core.StandardHost.addChild(StandardHost.java:607)
	at org.apache.catalina.startup.HostConfig.deployDirectory(HostConfig.java:1055)
	at org.apache.catalina.startup.HostConfig.deployDirectories(HostConfig.java:978)
	at org.apache.catalina.startup.HostConfig.deployApps(HostConfig.java:472)
	at org.apache.catalina.startup.HostConfig.start(HostConfig.java:1322)
	at org.apache.catalina.startup.HostConfig.lifecycleEvent(HostConfig.java:311)
	at org.apache.catalina.util.LifecycleSupport.fireLifecycleEvent(LifecycleSupport.java:119)
	at org.apache.catalina.util.LifecycleBase.fireLifecycleEvent(LifecycleBase.java:89)
	at org.apache.catalina.util.LifecycleBase.setStateInternal(LifecycleBase.java:379)
	at org.apache.catalina.util.LifecycleBase.setState(LifecycleBase.java:324)
	at org.apache.catalina.core.ContainerBase.startInternal(ContainerBase.java:1041)
	at org.apache.catalina.core.StandardHost.startInternal(StandardHost.java:774)
	at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:145)
	at org.apache.catalina.core.ContainerBase.startInternal(ContainerBase.java:1033)
	at org.apache.catalina.core.StandardEngine.startInternal(StandardEngine.java:291)
	at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:145)
	at org.apache.catalina.core.StandardService.startInternal(StandardService.java:443)
	at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:145)
	at org.apache.catalina.core.StandardServer.startInternal(StandardServer.java:727)
	at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:145)
	at org.apache.catalina.startup.Catalina.start(Catalina.java:620)
	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.start(Bootstrap.java:303)
	at org.apache.catalina.startup.Bootstrap.main(Bootstrap.java:431)
7-mag-2011 19.11.00 org.apache.catalina.startup.HostConfig deployDirectory
INFO: Deploying web application directory manager
7-mag-2011 19.11.00 org.apache.catalina.startup.HostConfig deployDirectory
GRAVE: Error deploying web application directory manager
java.lang.NoSuchMethodError: javax.servlet.ServletContext.getResourcePaths(Ljava/lang/String;)Ljava/util/Set;
	at org.apache.tomcat.util.scan.StandardJarScanner.scan(StandardJarScanner.java:144)
	at org.apache.catalina.startup.ContextConfig.processJarsForWebFragments(ContextConfig.java:1738)
	at org.apache.catalina.startup.ContextConfig.webConfig(ContextConfig.java:1223)
	at org.apache.catalina.startup.ContextConfig.configureStart(ContextConfig.java:882)
	at org.apache.catalina.startup.ContextConfig.lifecycleEvent(ContextConfig.java:317)
	at org.apache.catalina.util.LifecycleSupport.fireLifecycleEvent(LifecycleSupport.java:119)
	at org.apache.catalina.util.LifecycleBase.fireLifecycleEvent(LifecycleBase.java:89)
	at org.apache.catalina.core.StandardContext.startInternal(StandardContext.java:5081)
	at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:145)
	at org.apache.catalina.core.ContainerBase.addChildInternal(ContainerBase.java:812)
	at org.apache.catalina.core.ContainerBase.addChild(ContainerBase.java:787)
	at org.apache.catalina.core.StandardHost.addChild(StandardHost.java:607)
	at org.apache.catalina.startup.HostConfig.deployDirectory(HostConfig.java:1055)
	at org.apache.catalina.startup.HostConfig.deployDirectories(HostConfig.java:978)
	at org.apache.catalina.startup.HostConfig.deployApps(HostConfig.java:472)
	at org.apache.catalina.startup.HostConfig.start(HostConfig.java:1322)
	at org.apache.catalina.startup.HostConfig.lifecycleEvent(HostConfig.java:311)
	at org.apache.catalina.util.LifecycleSupport.fireLifecycleEvent(LifecycleSupport.java:119)
	at org.apache.catalina.util.LifecycleBase.fireLifecycleEvent(LifecycleBase.java:89)
	at org.apache.catalina.util.LifecycleBase.setStateInternal(LifecycleBase.java:379)
	at org.apache.catalina.util.LifecycleBase.setState(LifecycleBase.java:324)
	at org.apache.catalina.core.ContainerBase.startInternal(ContainerBase.java:1041)
	at org.apache.catalina.core.StandardHost.startInternal(StandardHost.java:774)
	at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:145)
	at org.apache.catalina.core.ContainerBase.startInternal(ContainerBase.java:1033)
	at org.apache.catalina.core.StandardEngine.startInternal(StandardEngine.java:291)
	at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:145)
	at org.apache.catalina.core.StandardService.startInternal(StandardService.java:443)
	at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:145)
	at org.apache.catalina.core.StandardServer.startInternal(StandardServer.java:727)
	at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:145)
	at org.apache.catalina.startup.Catalina.start(Catalina.java:620)
	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.start(Bootstrap.java:303)
	at org.apache.catalina.startup.Bootstrap.main(Bootstrap.java:431)
7-mag-2011 19.11.00 org.apache.catalina.startup.HostConfig deployDirectory
INFO: Deploying web application directory ROOT
Intanto grazie per l'interessamento e il prezioso aiuto.
Ciao,
Luigi