This week's book giveaway is in the OCMJEA forum. We're giving away four copies of OCM Java EE 6 Enterprise Architect Exam Guide and have Paul Allen & Joseph Bambara on-line! See this thread for details.
I'm not sure why you'd want to set a system property in the catalina.bat file. If you want to set a variable for the web application to use you can set a ServletContext init-param up by putting the following in web.xml
Then when you want to reference the parameter you can get it from within a servlet like this: