Thank, I get it. So, You mean to be able to use the statefullness of statefull session beans, I should keep a single instance of the bean. But, If i use a state**less** bean, and i kept a single instance from it while setting the bean data, It should save the same date. In other words, If I have changed the constructor above to a static initialize block, then change the stateFul bean to a stateLess bean, I will get code will still works, I just tried it. So, What is the story behind that? View the original post : http://www.jboss.org/index.html?module=bb&op=viewtopic&p=4259340#... Reply to the post : http://www.jboss.org/index.html?module=bb&op=posting&mode=reply&a...