basic difference is JBOSSAS is standard j2ee server where as JBOSSESB server is JBOSSAS with ESB support inbuilt, now JBOSSESB is a EAI (enterprise application integration ) framework which enables the SOA based development using JBOSSAS(AS-Application Server)
so JBOSSESB Server and JBOSSAS are basically servers and JBOSSESB is a framework.
Just to clarify, the jbossesb-server is not a full blown J2EE server.
It is based on the same core as JBossAS and reuses a lot of the AS technology, but there are differences. Two differences which spring to mind are no support for EAR deployments nor for EJB.
The intention of the jbossesb-server was to create a pre-configured server satisfying most of the ESB requirements, providing an easy route for people to use the technology.
If you need access to the full J2EE technologies then we would always suggest that you install the ESB components into an instance of JBossAS.
Thank you very much Kevin and vishal12345. It's just I need to know.