Why Spring Security?
Spring Security exists to fill a gap in the universe of Java third-party libraries, much as the Spring Framework originally did when it was first introduced. Standards such as Java Authentication and Authorization Service (JAAS) or Java EE Security do offer some ways of performing some of the same authentication and authorization functions, but Spring Security is a winner because it includes everything you need to implement a top-to-bottom application security solution in a concise and sensible way.
Additionally, Spring Security appeals to many, because it offers out-of-the-box integration with many common enterprise authentication systems; so it's adaptable to most situations with little effort (beyond configuration) ...
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