Tomcat:Install Tomcat 4 as service on Windows NT/2000/XP
Tomcat:Install Tomcat 5 as service on Windows NT/2000/XP
If you are experiencing issues deploying WAR files, for instance WAR files with context.xml files in where the contents of context.xml appears to be being ignored and/or you are getting the following error:
org.apache.tomcat.dbcp.dbcp.SQLNestedException: Cannot create JDBC driver of class for connect URL 'null'
then check the $CATALINA_BASE/conf/[engine]/[host]/ folders are writable by the user Tomcat is running as.