Getting system startup date and build version in Grails

get-startup-and-build-version-metadata-in-grails.groovy

/** 
 * Simple build metadata from system.
 * 
 * To populate application version, just give following parameter while generation WAR package on grails CLI.
 * 
 * $ grails "set-version 1.4" "clean" "war myproject.war"
 * 
 * '1.4' is just an example for build version. If you want to auto generate it by your CI such as Jenkins, then
 * create an environment variable and pass it to CLI command.
 * 
 * $ grails "set-version ${BUILD_VERSION}" "clean" "war myproject.war"
 * 
 * Here is the image that shows you how BUILD_VERSION variable can be generated from date formatter in Jenkins:
 * https://drive.google.com/file/d/0BxiyyXf6pIAmMnlxTXdXMWoyVUk/view?pref=2&pli=1
*/
def renderStatistics() {
  render "System Startup Date: ${new Date(grailsApplication.mainContext.getStartupDate())}\n" +
          "Build Version: ${grailsApplication.metadata.getApplicationVersion()}"
}