JMS Persistent Mode (can I use alternate provider, ie database)

When I am using JMS Persistence in Queued messages or PubSub, can I use an alternate form of persistence.

In other words can I run persistence thru a database like DB2 or Oracle, instead of the native support by the SAP engine.

I dont mean using MQSeries or another JMS provider, but rather having the SAP JMS connect to DB2 or Oracle to provide a more robust form of persistence.

Is that possible ?

Thanks, John