The Application Server supports iterative development. Whenever you make a change to a Java EE application, you must redeploy the application.
Modifying a Class File
To modify a class file in an enterprise bean, you change the source code, recompile it, and redeploy the application. For example, if you want to change the exchange rate in the dollarToYen business method of the ConverterBean class, you would follow these steps.
To modify the contents of a WAR file, or to modify the application client, follow the preceding steps.