D Swaminathan wrote:
>
> Hi,
>
> I have a query regarding entity bean failover. To
> begin with, is there any such thing as entity bean
> failover? The scenario is such that the EJB client has
> obtained a reference to the bean (EJBObject) through a
> finder method and quite possibly invoked a few methods
> on the bean. At this stage, the server/container
> crashes. What would happen for subsequent method
> invocations on the bean ( assuming that we have a
> clustered server environment)?
The EJB server will deal with that at the stub level by looking up the
same entity on a different server if you are not within a transaction.
If you are within a transaction, then in all probability your
transaction just failed.
> Also, how can the EJB container achieve this? Would
> this imply that to have entity bean failover all
> entity beans would have to be replicated across the
> containers? What would be the implication of such
> replication on concurrent access to the entity beans?
The EJB container achieves that by reloading that entity bean on the
other server. It may, or may not, and that might depend on the bean (and
certainly the EJB container) replicate the entity bean. If your entity
bean simply holds information retrieved from the database, just
reloading it on the other server will do the trick.
arkin
> We are trying to come up with a set of test suites to
> compare the different EJB servers and this is one of
> the things we needed to check.
>
> Prasad
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--
----------------------------------------------------------------------
Assaf Arkin www.exoffice.com
CTO, Exoffice Technologies, Inc. www.exolab.org
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