It is only necessary to modify the name of the EJB references in the JNDI context mentioned above (moving these references from the JNDI context root to the sub-context ejb/) when the EJBs are mapped to the root of the JNDI context in the existing WebLogic application.
If these EJBs are already mapped to the JNDI sub-context ejb/ in the existing application, no modification is required.
However, when configuring the JNDI names of EJBs in the deployment descriptor within the Sun Java Studio IDE, it is important to avoid including the prefix ejb/ in the JNDI name of an EJB. Remember that these EJB references are automatically placed in the JNDI ejb/ sub-context with Application Server 9. So, if an EJB is given to the JNDI name BankTeller in its deployment descriptor, the reference to this EJB will be translated by Application Server 9 into ejb/BankTeller, and this is the JNDI name that client components of this EJB must use when carrying out a lookup.