I want to deploy the same application many times, in the same tomcat. But I need to always edit application.properties to change application name so that the grails.project.key is changed in web.xml. I have done this with little changes to Package.groovy, so I could something like: grails -Dgrails.env=malabaris -Dapp.name=malabaris -Dproject.key=malabaris my-war MyWar is the following script: ---------------------------------------------------------------------------------------------------- import org.codehaus.groovy.grails.commons.GrailsClassUtils as GCU grailsHome = Ant.project.properties."environment.GRAILS_HOME" includeTargets << new File ( "${grailsHome}/scripts/Init.groovy" ) includeTargets << new File ( "${grailsHome}/scripts/War.groovy" ) target('default': "The description of the script goes here!") { if(System.getProperty("app.name")) grailsAppName = System.getProperty("app.name") def tmpWebXml = "${userHome}/.grails/${grailsVersion}/projects/${baseName}/web.xml.tmp" Ant.delete(file:tmpWebXml, failonerror:false) war() } ---------------------------------------------------------------------------------------------------- The thig here is that tmpWebXml must be deleted so it is generated again and grails.project.key is replaced with the correct value. Changes to Package.groovy were in generateWebXml target: ---------------------------------------------------------------------------------------------------- def grailsProjKey = Ant.antProject.properties.'grails.project.key' if(System.getProperty("project.key")){ grailsProjKey = System.getProperty("project.key") } Ant.replace(file:tmpWebXml, token:"@grails.project.key@", value:"${grailsProjKey}") ---------------------------------------------------------------------------------------------------- With these minor enhancements, I dont need anymore to edit application.properties, and I could create a bat file to each instance of the application. Felipe