accessing current transaction ID of EJB method?

hi all,

we are currently experimenting with EJB3-SLSB's
TransactionAttribe-Annotations on methods, especially  to handle
long-running batch jobs in a correct way:

e.g. there is a single remote method of an EJB3 SLSB named:

doDataBatchProcessing

- currently method invocation takes about 1 hour which exceeds jtm
transaction timeout. as this is basically bad behaviour we want to
redesign
it to  multiple short-time transactions instead of a single long-time
transaction by:

doDataBatchProcessing: TransactionAttribeType.NOT_SUPPORTED

and WITHIN doDataBatchProcessing another method is called "per client"
- 

for(Client c: clients)
{
    //batch proc. for specific client
    batchProcessClient(c);
}


where
batchProcessClient(c) has TransactionAttributeType.REQUIRES_NEW


--> this should result in several transactions for each single client
instead of a very long running single one -- is that correct?

How can we test this - is there a way to lookup / access the current CMT
transaction ID  or similar ??


thanks for any tips!

regards,
HANS