http://www.velocityreviews.com/forums/t130752-how-do-i-find-tomcat-version-thats-already-installed.html You should be able to find this in the log called ‘catalina.out’. Alternatively, you can go right to the source; open $TOMCAT_HOME/server/lib/catalina.jar in a tool capable of handling zip or jar files, and read the file called org/apache/catalina/util/ServerInfo.properties. That last bit is not guaranteed to work across multiple versions, though.
http://www.smartdraw.com/tutorials/software/uml/tutorial_01.htm e.g. Activity Diagram
"Installed extensions are JAR files in the lib/ext directory of the Java Runtime Environment (JRETM) software" http://java.sun.com/docs/books/tutorial/ext/basics/install.html