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EJB Components represent set of services with defined interface

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EJB Components represent set of services with defined interface
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  EJB Components represent set of services with defined interface.   CTM is the very sophisticated distribution system: it is combination of a.   TP Monitor: manages system resources, memory, transaction and database access. Not object oriented. b.   ORB: has communication framework, object oriented but doesn’t office system level services and resource management.     EJB component types Types of EJB: 1.   Entity Bean: Real World Data record, mostly stored in DB. Supports concurrency. 2.   Session Bean: controlling workflow  –  a defined series of tasks carried out by entity bean. Not concurrent. 3.   Message Bean: Stateless bean that responds to request placed by clients using JMS. Unlike session beans they don’t have an interface which defines what methods can be  invoked. Concurrent.  EJB object must implement component interface. All remote interfaces should implement javax.ejb.EJBObject   and local interface javax.ejb.LocalEjbObject  Client deals with EJBObject , however it should get the instance from EJBHome  object, hence EJBHome should implement Bean’s home interface.   Summary
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