13.7.2 Web application auto reload
If you check the Reloading enabled option, the class path of the Web application is monitored and all components, JAR or class files, are reloaded whenever a component update is detected. The Web module's class loader is shut down and restarted. The reload interval is the interval between reloads of the Web application. It is set in seconds.
The auto reload feature plays a critical role in hot deployment and dynamic reload of your application.
Important: You must set the Reloading enabled option to true for JSP files to be reloaded when they are changed on the file system. Reloading a JSP does not trigger the reload of the Web module, because separate class loaders are used for servlets and JSP.
This option is set to true by default, with the reload interval set to three (3) seconds. In production mode, you might consider making the reload interval much higher.