HI,
I'm using JBOSS 4.0.4GA. To demonstrate my question below I've done a brand new
install of jboss.
I thought that no state at all was kept in a stateless session bean between
lookups - and is is really possible to share a stateless session bean across
sessions!
Take a look at this bean:
| package com.jaboj.mm.dao;
|
| import javax.ejb.Stateless;
|
| import javax.persistence.EntityManager;
| import javax.persistence.PersistenceContext;
|
| @Stateless
| public class LocationDAO implements LocationDAOLocal {
|
| @PersistenceContext(unitName = "MM")
| private EntityManager em;
|
| private int count = 0;
|
| public LocationDAO() {
| count = 0;
| }
|
| public String getHello() {
| count++;
| System.out.println("COUNT: " + count);
| return "hello: " + count;
| }
|
| }
|
It's quite simple. Everytime hello() is called, count is increased by one. So,
I would expect, that the first time I invoke hello() after a bean lookup,
"hello: 1" is returned. But that isn't allway the case.
I use the following code to lookup the sessionbean, from a test servlet.
| ---
| InitialContext ctx = new InitialContext();
| LocationDAOLocal bean =
| (LocationDAOLocal)ctx.lookup("mm2007/LocationDAO/local");
| out.print(bean.getHello());
| --
|
When using this method to lookup the stateless session bean, the beans sometime
get reused - even accross sessions! I really don't understand why it is
possible to get the return values "hello: 2", "hello: 3", ... etc. from the
session bean, on the first call after lookup!
Below I've pasted the console-output after I've invoked the servlet 3 times
from IE and Firefox - to demonstrate that the session beans also are shared
accross sessions!!!
| 22:46:09,763 INFO [STDOUT] COUNT: 1 (IE)
| 22:46:11,235 INFO [STDOUT] COUNT: 2 (IE)
| 22:46:15,591 INFO [STDOUT] COUNT: 3 (FIREFOX)
|
What am I doing wrong - this can't be real?
Regards
Jacob
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