If you use 'exploded' mode it should be picked up directly (any file change in the directory force a redeploy)
Add attribute 'auto-deploy-exploded=true' to the deployment-scanner or add a (empty) file <yourAppName>.dodeploy in parallel to the directory of you app in deployments.
But be aware this in ONLY for developer because it can not ensured that the scanner deploy the directory in the middle of changing content.