Since the J2EE SDK is intended for experimentation, it supports iterative development. Whenever you make a change to a J2EE application, you must redeploy the application.
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.
Recompile ConverterBean.java by typing ant converter.
In deploytool, select Tools→Update Files.
The Update Files dialog box appears. If the modified files are listed at the top of the dialog, click OK and go to step 6. ...