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Re: EJB Handle

Kancharlapalli,Sridhar

2004-04-08


Get a Home Handle instead of the EJBObject Handle, this may not solve the problem u have told but definitely a better way to access Stateless beans.

Check how many concurrent users are initially requesting for the bean. Optimally u don't gain anything by setting the intial pool size to 5 which is a very small number for an enterprise application.

I would suggest,
- Firstly, increase the intial pool size of the beans and check if the error re-occurs.
- Secondly, don't explicitly set any pool size let container handle it (even though a performance trade off).


Regards,
-Sridhar Kancharlapalli.




-----Original Message-----
From: George Maggessy [mailto:gmaggess@(protected)]
Sent: Thursday, April 08, 2004 7:36 AM
To: J2EEPATTERNS-INTEREST@(protected)
Subject: EJB Handle


Hi Gurus,

I have a business delegate, that is also a singleton, that
caches an EJB Handle instance. I donĀ“t why but my initial
lookups fail and after a pair of trials my application
starts to work well and it doesn't fail anymore . Could
anybody help me out with this problem? I'm working with a
clustered application and all of my EJBs have an initial
pool size of 5.

Thanks in advance,
George

public class MasterDelegateHandler {

 private static MasterDelegateHandler instance = null;
 private static Handle remoteHandle;

 /**
  * Constructor
  */
 private MasterDelegateHandler() {
   try {
     MasterSessionHome home =

(MasterSessionHome)ServiceLocator.getHomeSession(
       GeneralConstants.JNDI_MASTER_SESSION);
     remoteHandle = home.create().getHandle();
   } catch (Exception e) {
     e.printStackTrace();
   }
 }

 public static synchronized MasterDelegateHandler
getInstance() {

   if (remoteHandle == null) {
     instance = new MasterDelegateHandler();
   }
   return instance;
 }

 private MasterSession getEJB() {

   MasterSession remote = null;
   try {
     remote =
(MasterSession)PortableRemoteObject.narrow(
       remoteHandle.getEJBObject(),
MasterSession.class);
   } catch (RemoteException ex) {
     ex.printStackTrace();
   } catch (ClassCastException ex) {
     ex.printStackTrace();
   }
   return remote;
 }

 public ResponseVO getAllIra() {
   ResponseVO response = new ResponseVO(null);
   try {
     response = getEJB().getAllIra();
   } catch (Exception ex) {
      ...
   }
   return response;
 }


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