What is the difference between a Server, a Container, and a Connector?

Shaun Childers

To keep things (very) simple:

An EJB server is an application, usually a product such as BEA WebLogic, that provides (or should provide) for concurrent client connections and manages system resources such as threads, processes, memory, database connections, network connections, etc.

An EJB container runs inside (or within) an EJB server, and provides deployed EJB beans with transaction and security management, etc. The EJB container insulates an EJB bean from the specifics of an underlying EJB server by providing a simple, standard API between the EJB bean and its container.

(Note: The EJB 1.1 specification makes it clear that it does not architect the interface between the EJB container and EJB server, which it says it left up to the vendor on how to split the implementation of the required functionality between the two. Thus there is no clear distinction between server and container.)

A Connector provides the ability for any Enterprise Information System (EIS) to plug into any EJB server which supports the Connector architecture. See http://java.sun.com/j2ee/connector/ for more indepth information on Connectors.

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