Packaging Utility Classes or Library JAR Files in a Portable J2EE Application Article
The J2EE platform supports the common use case of an application using a library that is provided to the application code. Learn the mechanisms available in the J2EE platform for including libraries in a portable application. Review the tools that are available for helping the developer determine if the mechanism is used correctly. This article also describes several use case scenarios showing different types of application uses of library files and which mechanisms should be used for each scenario.