JSR 220: Enterprise JavaBeansTM,Version 3.0, Final Release, 4.5 Stateless Session Beans, 2nd paragraph:
The term ?stateless? signifies that an instance has no state for a specific client. However, the instance
variables of the instance can contain the state across client-invoked method calls. Examples of such
state include an open database connection and an object reference to an enterprise bean object.