This guide to Jruby, a Java implementation of the Ruby programming language, provides concise information for programmers experienced in either language, in the use of this efficient integration tool. Beginning with an overview of the Jruby core components, the volume covers such topics as deriving Java from Ruby code, embedding Jruby in Java, Rails, relational databases, code testing in Jruby and GUI building. The volume also includes a reference section containing chapters on Java and Ruby interoperability, configuration advice and calling external code. Code examples are provided throughout and access to additional online resources is included. The authors are key contributors to the Jruby project. Distributed by O'Reilly Media. Annotation ©2011 Book News, Inc., Portland, OR (booknews.com)