Cannot find /Library/Tomcat/Home/bin/setclasspath.sh

When starting Tomcat on Lion:

$ /Library/Tomcat/bin/startup.sh 

And you encountered this error:

Cannot find /Library/Tomcat/Home/bin/setclasspath.sh This file is needed to run this program

just unset the CATALINA_HOME variable:

$ unset CATALINA_HOME

Then run this again:

/Library/Tomcat/bin/startup.sh 

Then visit http://127.0.0.1:8080

Troubleshooting idea got from this: http://www.malisphoto.com/tips/tomcatonosx.html

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Another approach is to use sudo:

sudo /Library/Tomcat/bin/startup.sh 

Then visit http://127.0.0.1:8080