In This ChapterApplications typically divide their functionality across multiple tiers, each of which has a specific purpose. This division makes it easier to understand and maintain an architecture that allows existing and future integration of different systems. The J2EE environment divides these tiers into the Client tier, Web tier, the Enterprise JavaBeans tier , and the Enterprise Information Systems tier (EIS). The Client tier is where the user interacts with the J2EE application. The Web tier makes an application available on the World Wide Web. The Enterprise JavaBeans tier provides portable, available, scalable access to data and business rules. EJB components reside in an EJB container that manages security, transactions, and concurrent data access. The Enterprise Information Systems tier allows the J2EE application to integrate with other enterprise information systems such as databases, enterprise resource planning systems, and legacy systems. A discussion of the EIS tier is beyond the scope of this book. This chapter addresses database security, however, because it is an integral security need of an enterprise solution.
Java Security Solutions ISBN: 0764549286
EAN: 2147483647 Year: 2001
Pages: 222 Authors: Rich Helton, Johennie Helton
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