This week's book giveaway is in the OCAJP 8 forum. We're giving away four copies of OCA Java SE 8 Programmer I Study Guide and have Edward Finegan & Robert Liguori on-line! See this thread for details.
The EJBContext is the interface specifying the container-provided runtime context available to all types of enterprise Java beans.
The sub-interfaces, EntityContext, MessageDrivenContext and SessionContext, specify additional runtime context available only to particular EJB types.