Hi, Adding to the discussion, I think there are many business scenarios, where a singleton stateful instance is needed for the business processing which may be accessed concurrently. In that case, how can I use EJBS to implement that?
Karthik -----Original Message----- From: A mailing list for Enterprise JavaBeans development [mailto:[EMAIL PROTECTED]]On Behalf Of Kenneth D. Litwak Sent: Wednesday, July 17, 2002 4:53 PM To: [EMAIL PROTECTED] Subject: Re: Handles and threads >I think you are confusing bean instance with remote stub instance. The spec prohibits a container from accessing a bean instance from two threads. However, it is not as clear on client-side concurrent access to EJBObjects, and this behavior may be different across vendors. Note the spec is clear on concurrent access of StatefulSessionBean EJBObjects, which is prohibited and will throw ConcurrentModificationException or ReentranceException. Gene, this is exactly my point. The spec says that multiple threads accessing a staeful session bean (because they are multiple callers, each on its own thread) is illegal for a stateful session bean. Therefore, what would be the piont of getting a handle to a staeful session bean? Since you don't get to hae any one specific stateless session bean across calls, that's obviously useless, even if a container allowed multi-thread access to a stateless session bean. Given what you've said about stateful session beans, which was my point. what good would a handle do you? Since the first caller already has an object reference to the bean, getting a handle as well would be redundant. SInce no other caller can use the same stateful session bean, passing any other caller the handle would only invite an exception. Ken When it comes to SLSBs, though, you're at the mercy of your container. >Gene > "Kenneth D. Litwak" <[EMAIL PROTECTED]> wrote: According to the spec, it is illegal for two client threads to access the >same session bean instance. So let/'s say I get a handle to my bean instance >(not a home handle). I cannot give this handle to another client because it is >illegal for two clients to access the same session bean instance. I already >have a reference to the bean's EJBObject before I get a handle. So hat good is >the handle? Thanks. > > >Ken > >=========================================================================== >To unsubscribe, send email to [EMAIL PROTECTED] and include in the body >of the message "signoff EJB-INTEREST". For general help, send email to >[EMAIL PROTECTED] and include in the body of the message "help". > > > >--------------------------------- >Do You Yahoo!? >Yahoo! Autos - Get free new car price quotes =========================================================================== To unsubscribe, send email to [EMAIL PROTECTED] and include in the body of the message "signoff EJB-INTEREST". For general help, send email to [EMAIL PROTECTED] and include in the body of the message "help". =========================================================================== To unsubscribe, send email to [EMAIL PROTECTED] and include in the body of the message "signoff EJB-INTEREST". For general help, send email to [EMAIL PROTECTED] and include in the body of the message "help".
