Glossary

Activation

A contrary concept to inactivation (or passivation). Indicates that a bean instance is moved from the secondary storage to the runtime memory.

Active Management

Indicates that email is automatically transmitted in an abnormal situation in JEUS.

Bean Pool

A pool of EJB instances

Bean Type

Either of J2EE basic bean type (e.g. stateless, stateful, entity and message-driven bean) or a bean defined by a developer (a sub bean of the basic J2EE bean).

BMP

Bean-managed persistence entity bean.

CMP

Container-managed persistence entity bean.

Connection Pool

Pool of EJB objects. These objects are responsible for connecting a client to EJB and communicating.

DD

An abbreviation of deployment descriptor.

EJB

Enterprise Java Beans.

EJB Clustering

The settings of EJB beans which are distributed in multiple EJB engines. It may look like a bean from the client side, but internally loads are balanced for improving stability and performances.

EJB Client

A component using an EJB method (e.g. an independent Java application, Servlet or another EJB)

EJB Engine

"EJB container" in the J2EE specification. This provides a fundamental environment of the EJB component.

EJB Module

One EJB package in EJB JAR, or more. An EJB deployed to an EJB engine uses the EJB module.

Entity Cache

A special cache used to keep inactivated ones in entity beans. Only when this cache is full, those beans are inactivated to the secondary storage. Entity cache is used for performance improvement.

MDB

Message Driven Bean

Object Management

Refer to 'connection pool' and 'bean pool environment'.

Passivation

To move an EJB instance from the runtime memory to the secondary storage until requested.

Round Robin

It is the same as the queue data structure, and selected from the one that entered the queue earlier. This guarantees fair load-balancing for each component.

SF

Stateful Session Bean

SL

Stateless Session Bean

Thread Ticket Pool

A pool of access tickets. To access an EJB from JEUS, the client must obtain “thread ticket” from the thread ticket pool.