EJB provide developers architectural independence
insulates developers from the underlying middleware, since the only environment
an EJB developer sees is the Java environment.
It also helps the EJB server/container vendor to change and make
improvements on the underlying middleware layer without affecting a userâ€™s
existing enterprise applications.
WORA for server side components
Since EJB is based on Java
technology, both the developer and the user are guaranteed that their components
are Write Once, Run Anywhere (WORA). As
long as an EJB Server faithfully conforms to the EJB specification, any EJB
application should run within that server.
EJB establishes Roles for Application Development
specification assigns specific roles for project participants charged with
enterprise application development utilizing EJB.
vendor can take care of providing support for complex system services and make
available an organized framework for a Bean to execute in, without assistance
from Bean developers.
EJB provides Distributed Transaction support
transparency for distributed transactions. This means that a client can begin a transaction and then
invoke methods on Beans present within two different servers, running on
different machines, platforms or JVM.
It helps create Portable and Scalable solutions
conforming to the EJB API will install and run in a portable fashion on any EJB
It provides of vendor specific enhancements
Since the EJB specification provides a lot of flexibility for the vendors to create their own enhancements, the EJB environment may end being feature rich.
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