"dimitris(a)jboss.org" wrote : No. A bean is always guaranteed to be called by one thread at any given point. May be I'm wrong about SLSB because I'm not strong with EJB, but I really don't see any sense in this guarantee. If code hasn't internal state it is thread safe, so any constraints are exceeded, isn't it? Could you explain the sense of this guarantee or point me where I may read about this constraint? Thanks in advance, Dmitry Trunikov View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=4113292#... Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&a...