CHAPTER 6Exploring CrosscuttingDesign Patterns
Most enterprise applications should be secured to prevent malicious access. They also require transaction support to maintain data consistency. The Java EE platform containers provide support for both security and transaction. However, these services can be applied in any of the application tiers. Security, for example, can be applied in the presentation tier to prevent unauthorized access of web resources such as Java Server Pages. The EJB business tier components also require protection because they can be accessed by different remote clients. The web services in the integration tier also need secured access. Similarly, transactional services may be used by the business tier or integration tier ...
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