Failure in deploying the EAR file in Borland Enterprise Server

[Stephen]

I am now using Borland Enterprise Server 5.0 for the server while I am
using JBuilder 6 for the development of the EJB. In my project, there
is a session bean (HelloBean), and jsp files and servlet files. A jar
file is generated for the EJB while a war file is generated for the
webapps. When I try to deploy the war file in the Borland Enterprise
Server, it is successful. Then I build the EAR file in the JBuilder,
and deploy it in the Borland Enterprise Server. However, when it
verify the bean modules (hello_beans.jar), the following errors
display:
#### Error: [hello_beans.jar] Session Bean "Hello"
A session bean's implementation class must be an instance of
javax.ejb.SessionBean:
examples.HelloBean
#### Error: [hello_beans.jar] Session Bean "Hello"
Cannot proceed verifying other aspects of this bean unless fatal
error(s) are fixed
I have found from newsgroup, and some people said that it's because
the jar file include the javax.ejb classes. However, I do not
understand about it, and don't know how to delete the classes in the
jar. How can I do this? Thanks!

Stephen