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> ## Security

> The J2EE application programming model insulates developers from mechanism-specific implementation details of application security. The J2EE platform provides this insulation in a way that enhances the portability of applications, allowing them to be deployed in diverse security environments.

> Some of the material in this chapter assumes that you understand basic security concepts. To learn more about these concepts, we recommend that you explore `http://java.sun.com/j2se/1.4.2/docs/guide/security/index.html` before you begin this chapter.

> If you need to make changes to the Sun Java System Application Server 8, and have administrator privileges, read the Application Server's Administration Guide.

> If you are a developer who wants to add security to existing J2EE and Web services applications, you are in the right place.

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All of the material in The J2EE(TM) 1.4 Tutorial is copyright-protected and may not be published in other works without express written permission from Sun Microsystems.