read WAS docs about rapid deployment.
In few words, it creates a single monitored directory that listens for fully composed EAR files or application module such as WAR,
EJB JAR files, or standalone resource adapter archive (RAR) files.
If you place EAR files inside this monitored directory, the EAR file is automatically deployed to the server. If you delete the EAR file from the monitored directory, that application is uninstalled from the server. If you place WAR or EJB jar files in the monitored directory, the rapid deployment tool generates the necessary EAR wrapper and then publishes that EAR file on the server. For RAR files, a wrapper is not created; the standalone RAR files are published to the server.
