Robert Hargreaves wrote:
>
> Dear All
>
> Is there any way of setting the isolation level of a CMP entity bean to
> TRANSACTION_SERIALIABLE?
Hi,
In the current version of JOnAS there is no way to set the isolation
level of a CMP
entity bean. In fact you work with the default isolation level of your
JDBC driver.
If you are in BMP you can use the setTransactionIsolation() method of
the connection
interface, however with the oracle thin jdbc driver I use when I try to
set isolation level I catch the following exception:
java.sql.SQLException: setTransactionIsolation: Only supports
TRANSACTION_READ_UNCOMMITTED
In JOnAS we have have not taken isolation level in deployment descriptor
into account because the EJB specifications have
changed on that from EJB 1.0 to 1.1, and will still change with 2.0.
Below an extract of a mail of Sun people on this subject:
----------------------------------------------------------------------------------
"Isolation was removed because the vendor community found that
implementing isolation at the component level was too difficult. Some
felt that isolation at the transaction level was the proper solution;
however, no concensus was reached on a specific replacement semantics.
This is a difficult problem that unfortunately has no clear solution at
this time. We will be examining it again in the context of EJB 2.0 and
possible by then a solution will emerge.
At present, EJBs can use JDBC isolation facilities (since databases
differ in the isolation facilities they provide, over reliance on this
can lead to portability problems) as well as any deployment time
isolation control provided by EJB containers. EJB 1.1 does not
require that containers provide any specific isolation control."
----------------------------------------------------------------------------------
It is not clear for us what strategy to choose for the next release of
JOnAS...
Best regards,
--
Philippe
Philippe Coq Groupe Bulll/BullSoft/OpenMaster Phone: (33) 04 76 29 78
49
Bull S.A - 1 rue de Provence - 38432 Echirolles Cedex France
[EMAIL PROTECTED] http://www-frec.bull.com
Download our EJBServer at http://www.bullsoft.com/ejb
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