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Struts & Hibernate
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| | | EJB Handle | EJB Handle 2004-04-08 - By BOWMAN, James
Back
Caching the home interface is fine, but you should not be caching the bean's
handle in this way. Caching a handle is okay if the bean is a stateful
session bean but if it is stateless you should avoid doing this.
Handles to stateful session beans are usually stored in the HTTPSession.
You should not cache a handle to a stateful session bean in a singleton or
anywhere that requests from other users may be able to access it from e.g.
an instance variable on a servlet. This would cause threading issues.
-- --Original Message-- --
From: George Maggessy [mailto:gmaggess@(protected)]
Sent: 08 April 2004 03:06
To: J2EEPATTERNS-INTEREST@(protected)
Subject: [J2EEPAT-INT] EJB Handle
Hi Gurus,
I have a business delegate, that is also a singleton, that
caches an EJB Handle instance. I don?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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