I tried your Stateless session bean example in the path http://www.roseindia.net/ejb/examples-of-StatelessBean.shtml. I got the below exception can you plese guide to rectify the issue.
$Proxy65 cannot be cast to com.javajazzup.examples.ejb3.stateless.CalculatorRemote1
An interface CalculatorRemote is created in that example which is stored in com.javajazzup.examples.ejb3.stateless. com.javajazzup.examples.ejb3.stateless is an user defined package. So you need to create that interface and stored in a package and call that package in jsp.