Re: Life cycle of beans(Session and entity)

[Murthy, A (CAP, GEFA, Contractor)]

How do we create or design entity beans if the tables have composite primary
keys?

Murthy A Suryanarayana
GE Financial Assurance
LTC - OPS2000 Project
------------------------------------------------------------------------
-------------------
Day     : (415) 492 7834
Dial-Com        :  8 *    277 7834
Fax     : (415) 492 7699
mailto  : [EMAIL PROTECTED]



-----Original Message-----
From: Dave Wolf [mailto:[EMAIL PROTECTED]]
Sent: Wednesday, August 16, 2000 2:07 PM
To: [EMAIL PROTECTED]
Subject: Re: Life cycle of beans(Session and entity)


Failover of stateful EJB's is a feature of some servers not of the code you
write or of EJB itself.  Sybase EAServer can manage failover of stateful
Session beans and will automatically recover the in-memory state of the
bean.  However this is generally a container feature rather then a
developer's work.

Dave Wolf
Internet Applications Division
Sybase


> -----Original Message-----
> From: A mailing list for Enterprise JavaBeans development
> [mailto:[EMAIL PROTECTED]]On Behalf Of Murthy, A (CAP, GEFA,
> Contractor)
> Sent: Wednesday, August 16, 2000 4:20 PM
> To: [EMAIL PROTECTED]
> Subject: Re: Life cycle of beans(Session and entity)
>
>
> Hi,
> Suppose I have a stateful session bean.  USer is logged into the
> aplication
> and doing his work. Suppose, in between application server crashed or
> shutdown. In that case, if we restart the server, can I restore or load my
> previous state of my stateful session bean before server crash / shutdown
> back after the server restarted again ? Can we store the state in
> the disk?
>
> Murthy A Suryanarayana
> GE Financial Assurance
> LTC - OPS2000 Project
> ------------------------------------------------------------------------
> -------------------
> Day     : (415) 492 7834
> Dial-Com        :  8 *    277 7834
> Fax     : (415) 492 7699
> mailto  : [EMAIL PROTECTED]
>
>
>
> -----Original Message-----
> From: Vivek Singh [mailto:[EMAIL PROTECTED]]
> Sent: Wednesday, August 16, 2000 3:35 AM
> To: [EMAIL PROTECTED]
> Subject: Re: Life cycle of beans(Session and entity)
>
>
> what u say seems quite logical to me....but the says otherwise
> e.g. Ed Roman
> matering EJB.
> I can copy and paste as these things r diabled in the book.
>
> another question:
> Can we have stateless session bean having ejbCreate method with
> arguments....
>
> If we can do that then we can manage session on our own....i am stating a
> probability where ejbCreate() method of stateless session bean need to be
> called everytime...
>
> Can someone clarify the confusion....
>
> Thanks
>
> Vivek
>
> -----Original Message-----
> From: Rajesh Balu [mailto:[EMAIL PROTECTED]]
> Sent: Friday, June 02, 2000 1:19 PM
> To: [EMAIL PROTECTED]
> Subject: Re: Life cycle of beans(Session and entity)
>
>
> While it is true that create() and ejbCreate() methods for a
> stateless bean
> cannot take any parameters, but when a client calls create() method on a
> stateless bean, ejbCreate() is not called on the bean instance.
> When an EJB
> server starts up, it creates a certain amount of stateless bean instances,
> calls the ejbCreate() method for each of them and stores them in the pool.
> Subsequently, when a client invokes create() method on the home,
> the server
> simply picks up an instance randomly and associates it to the EJBObject.
> This
> is significantly different from Entity and Stateful beans for which, the
> create() method is despatched to the corresponding ejbCreate() method.
>
> I hope my understanding is correct. If there is anything wrong, please
> correct
> me.  Thanks.
>
> Vivek Singh wrote:
>
> > The container pools the instances of the beans. When multiple
> clients call
> > create()......ejbCreate method of the bean will be called in all the
> > instances of the pooled bean......then the client is handed over an
> > EJBObject.
> > Same happens for statefull session beans...the difference is u can pass
> > parameters to the create method and the matching
> ejbCreate(.....) will be
> > called in that instance. Same for entity beans.......the instance can be
> > cached in this case if used before.
> >
> > -----Original Message-----
> > From: Samuel Abraham [mailto:[EMAIL PROTECTED]]
> > Sent: Monday, August 14, 2000 6:07 PM
> > To: [EMAIL PROTECTED]
> > Subject: Life cycle of beans(Session and entity)
> >
> > Hi all,
> > I have a doubt regarding bean life cycle(Session and Entity).
> > Assume that many clients are calling the create() method of a stateless
> > session beans.
> > Will the ejbCreate() be called whenever the create() method is called?
> > What will be the scenario in the case of stateful and entity beans?
> > TIA
> > Samuel
> >
> > ________________________________________________________________________
> > Get Your Private, Free E-mail from MSN Hotmail at http://www.hotmail.com
> >
> >
> ==================================================================
> =========
> > 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".
>
> ==================================================================
> =========
> 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".
>
> ==================================================================
> =========
> 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".

===========================================================================
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".