I'm using Jboss 4.2.1. MDBs asynchronized calls SLSBs. i put a counter in SLSB's constructor. so i can know the current bean comes from pool or just be created. my problem is i set max size = 100. but after the MDB receives 10,000 messages(in 10 seconds). the nuber of SLSb will be 2000 something. because the pool only holds 100 instances, i guess container destroyed those old instances and created new instance. i don't know why it doesn't keep old instances in the pool.

MDB

if(message instanceof ObjectMessage){
 String sessionBeanJNDI = message.getStringProperty("ApplicationName") + "LogLocal";

 BaseLogLocal asynchronizedLocal = logLocalMap.get(sessionBeanJNDI);
 if(asynchronizedLocal == null){
 BaseLogLocal baseLogLocal = (BaseLogLocal)cxt.lookup(sessionBeanJNDI);
 logLocalMap.put(sessionBeanJNDI, (BaseLogLocal)Asynch.getAsynchronousProxy(baseLogLocal));
 asynchronizedLocal = logLocalMap.get(sessionBeanJNDI);
 }
 ObjectMessage objectMessage = (ObjectMessage)message;
 Object object = objectMessage.getObject();

 asynchronizedLocal.saveLog(object, msgID);

 }else{
 logger.error("Not an ObjectMessage" + msgID);
 }