Enterprise JavaBean (EJB) Interview Questions and Answers


Brief description about local interfaces?

EEJB was originally designed around remote invocation using the Java Remote Method
Invocation (RMI) mechanism, and later extended to support to standard CORBA transport
for these calls using RMI/IIOP. This design allowed for maximum flexibility in developing
applications without consideration for the deployment scenario, and was a strong
feature in support of a goal of component reuse in J2EE. Many developers are using
EJBs locally, that is, some or all of their EJB calls are between beans in a single
container. With this feedback in mind, the EJB 2.0 expert group has created a local
interface mechanism. The local interface may be defined for a bean during development,
to allow streamlined calls to the bean if a caller is in the same container. This
does not involve the overhead involved with RMI like marshalling etc.

This facility will thus improve the performance of applications in which co-location
is planned. Local interfaces also provide the foundation for container-managed relationships
among entity beans with container-managed persistence.

Posted by:Richards