The book is based on Oracle JDeveloper 11g Studio Edition for Windows and Oracle WebLogic Server 11g, Windows version, which are the two main components of Oracle Fusion Middleware 11g and may be downloaded from http://www.oracle.com/technology/software/products/middleware/index.html. If you have Linux installed, the book may still be used (though the source code and samples have not been tested with Linux); just download and install the Linux versions of Oracle JDeveloper 11g and Oracle WebLogic Server 11g. Slight modifications may be required with the Linux install; for example, the directory paths on Linux would be different than the Windows directory paths used in the book. For one of the chapters, you would need to download and install Oracle Enterprise pack for Eclipse from http://www.oracle.com/tools/enterprise-eclipse-pack.html. For database, you would need to download and install Oracle Database 10g/11g from http://www.oracle.com/technology/software/products/database/index.html. For another chapter, you would need to download and install the open source MySQL 5.x database from http://www.mysql.com/downloads/mysql/. The annotations used in EJB 3.0 are a J2SE 5.0 feature; therefore, you need to install J2SE 5.0 or later.