Richard Monson-Haefel is the author of Enterprise JavaBeans, 3rd Edition, Java Message Service and one of the world's leading experts on Enterprise Java. He is co-founder of OpenEJB, an open source ...

The idea of constrained properties in Java is not new. Since JDK 1.1, a legion of JavaBeans developers has used a powerful framework found in the java.beans package to enforce data-validation rules.

Enterprise JavaBeans (EJB) is a specification for developing large-scale, distributed business applications on the Java platform. EJB 1.0 was released in 1998. The most current release, EJB 3.2.3, has ...