Create war file in grails

The war command will create a Web Application Archive (WAR) file which can be deployed on any Java EE compliant application server

grails war
grails test war
grails -Dgrails.env=foo war

Usage: 

grails [environment]* war [arguments]*

Arguments:

• nojars - Packages the WAR with no jar files. Used for shared deployment

Fired Events:

• StatusFinal - When the WAR file has been created

The war command will create a web application archive (WAR) file using the application name and version number. By default a war file deployable to the production environment will be created, but the environment can be specified using Grails standard convention

grails test war
grails dev war
grails prod war
grails war /foo/bar/mywar.war
grails war --nojars

Always better to call

grails clean

The clean command will delete all compiled resources from the current Grails application. Since Groovy is a compiled language, as with Java, this is sometimes useful to clear old instances of classes out and ensure correct compilation

Refer war