I changed the servlet :
        
  | private void showUser(HttpServletRequest request,
  |                     HttpServletResponse response) {
  |             try {
  |                     InitialContext ctx = new InitialContext();
  |                     userSession = (userSession) 
ctx.lookup("userSessionBean/local");
  |             } catch (Exception e) {
  |                     e.printStackTrace();
  |             }
  | 
  |             Collection<User> auser = userSession.getUsers();
  |                                           System.out.println(auser);
  |     
  |             if (auser != null)
  |                     for (User user : auser) {
  |                             System.out.println("User name : " + 
user.getName());
  |                             System.out.println("User id : " + user.getId());
  |                             System.out.println("User mgs : " + 
user.getMessage());
  |                     }
  |     }
  | 
Error msg:

  | 07:09:51,546 INFO  [STDOUT] [EMAIL PROTECTED], [EMAIL PROTECTED], [EMAIL 
PROTECTED], [EMAIL PROTECTED], [EMAIL PROTECTED], [EMAIL PROTECTED], [EMAIL 
PROTECTED], [EMAIL PROTECTED]
  | 07:09:51,546 ERROR [[ejb_servlet]] Servlet.service() for servlet 
ejb_servlet threw exception
  | java.lang.ClassCastException: ejb.persistence.User
  |     at servlet.ejb_servlet.showUser(ejb_servlet.java:53)
  |     at servlet.ejb_servlet.doGet(ejb_servlet.java:89)
  |     at javax.servlet.http.HttpServlet.service(HttpServlet.java:697)
  | 

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