title: Environment/system variables in server.xml
body: <p>How can I use environment/system variables in tomcat server.xml, context.xml, etc configuration files?</p>
  
  <p>I tried to use <code>${ENV_VAR_NAME}</code> (both for environment and system variable), <code>${env.ENV_VAR_NAME}</code> (for environment variables). And nothing seems to work. </p>