By Eric Jendrock
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Additional info for The The Java EE 6 Tutorial Basic Concepts. Volume 1
Example text
The JAX-RS API is new to the Java EE 6 platform. Managed Beans Managed Beans, lightweight container-managed objects (POJOs) with minimal requirements, support a small set of basic services, such as resource injection, lifecycle callbacks, and interceptors. Managed Beans represent a generalization of the managed beans specified by JavaServer Faces technology and can be used anywhere in a Java EE application, not just in web modules. The Managed Beans specification is part of the Java EE 6 platform specification (JSR 316).
The component-based and platform-independent Java EE architecture makes Java EE applications easy to write because business logic is organized into reusable components. In addition, the Java EE server provides underlying services in the form of a container for every component type. Because you do not have to develop these services yourself, you are free to concentrate on solving the business problem at hand. Container Services Containers are the interface between a component and the low-level platform-specific functionality that supports the component.
For example, the GlassFish Server runtime deployment descriptor contains such information as the context root of a web application, as well as GlassFish Server implementation-specific parameters, such as caching directives. xml and are located in the same META-INF directory as the Java EE deployment descriptor. A Java EE module consists of one or more Java EE components for the same container type and, optionally, one component deployment descriptor of that type. An enterprise bean module deployment descriptor, for example, declares transaction attributes and security authorizations for an enterprise bean.