The open source Eclipse has proven to be a best-of-class, extensible application development framework. Out of the zip file, Eclipse offers many tools for developing Java applications including wizards, unit testing, debuggers, and editors. However, these tools do not support the development of enterprise applications.
Up until this point, an enterprise developer using Eclipse had to spend a large amount of time locating and evaluating plug-ins to build a suite of enterprise tools. The Eclipse Web Tools project has changed that by providing a comprehensive tools kit for developing enterprise applications called the J2EE Standard Tools (JST). JST along with WST (Web Standard Tools) will make Eclipse a much more complete application development framework for Java developers.
Pro Eclipse JST covers these J2EE Standard Tools in detail. It's essentially a wide range of plug-ins for developing and integrating Servlets, JSPs, EJBs, and more that most other enterprise Java developers use on a daily basis into the Eclipse framework and IDE for use and professional practice.
For more information about the book, check out the authors' site, www.projst.com.