This week's book giveaways are in the Refactoring and Agile forums. We're giving away four copies each of Re-engineering Legacy Software and Docker in Action and have the authors on-line! See this thread and this one 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.