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Weld is the reference implementation of JSR-299, and is used by JBoss AS and GlassFish to provide CDI services for Java Enterprise Edition (Java EE) applications. Weld also goes beyond the environments and APIs defined by the JSR-299 specification by providing support for a number of other environments (such as a servlet container such as Tomcat, or Java SE).
You might also want to check out the Weld Extensions project which provides portable extensions to CDI (such as log injection and additional annotations for creating beans), and Seam, which provides integrations with other view layers (such as GWT and Wicket), other frameworks (such as Drools) as well as extensions to the ecosystem (such as support for security).
If you want to get started quickly using Weld (and, in turn, CDI) with JBoss AS, GlassFish or Tomcat and experiment with one of the examples, take a look at Chapter 6, Getting started with Weld. Otherwise read on for a exhaustive discussion of using Weld in all the environments and application servers it supports and the Weld extensions.
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