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one of the most important value propositions for frameworks like Spring has been the ability to easily extend the framework or integrate third-party solutions

SPI allows you to register your own beans, custom scopes, stereotypes, interceptors and decorators with CDI even if is it not included in the automatic scanning process (such as perhaps registering Spring beans as CDI beans), programmatically looking up CDI beans and injecting them into your own objects (such as injecting CDI beans into Spring beans) and adding/overriding annotation-metadata from other sources (such as from a database or property file)

SPI can be segmented into three parts. Interfaces like Bean, Interceptor and Decorator model container meta-data (there are a few other meta-data interfaces such as ObserverMethod, Producer, InjectionTarget, InjectionPoint, AnnotatedType, AnnotatedMethod, etc). Each meta-data object encapsulates everything that the CDI container needs to know about the meta-data type

Externalized Security Policy Management

Make Changes at Runtime

Flexible Security Model

Impersonalization

authenticates “as a user” or access application imitating his identity - without knowing his password

In fact people still love those books without realizing that the world has changed dramatically ever since

The reality check here is to wonder whether the rhetorics set forth by Rod Johnson in his 2003/2004 books are still actual today

So if you still care about those books, the best way to show your appreciation is probably to use them as your monitor stand