[jboss-user] [JBoss Getting Started Documentation] - Newbie Questions

jej2003 do-not-reply at jboss.com
Fri Sep 19 20:48:09 EDT 2008

I am trying to understand how EJB components (SLSB, SFSB, MDB) work.  If I have an MDB that has a reference to a SLSB and a SFSB like:

  | public class TestMDB implements MessageListener {
  | 	@EJB
  | 	private TestSLSB slsb;
  | 	@EJB
  | 	private TestSFSB sfsb;
  | 	public void onMessage(Message msg){
  | ...

I had thought that the SLSB was pulled from a pool of available objects (so could be the same instance but not necessary) while the SFSB would always be the same instance no matter how many times the onMessage was called so long as the MDB remained in memory, is this not the case?  One of the developers I work with was telling me that the SLSB and SFSB would both be the same instances no matter how many times the onMessage was called.  If this were the case I am not sure I completely understand what the difference between a SLSB and SFSB would be.  Additionally it would help to understand when injection occurs and for SFSB vs SLSB.

If anyone can help me figure out these questions I'd greatly appreciate it.

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