Difference between durablity and persistance

hi,
I am new to JMS and could anyone tell me what is the difference between durablity and persistance?
As far as i understood, persistance is with respect to the JMS Provider. Say, for example when the JMSProviderServer crashes, and if the message is persistant(by setting as a parameter in setDeliveryMode() method), when the server starts up, the message will be reaching the intended Message Consumers.
Durability is with respect to the Message Consumers. If the message consumers are subscribed as durable, then even if they are not active they will receive the message when they get connected to the Provider at a later time.
Is my understanding right?
If it is, i am getting one more doubt. What happens, if i set the message as nonpersistant type and publish to a topic and the durable subscriber is not active when the message is published? Will the durable subscriber be able to get the published message, when it becomes active again?
thanks,
desigan

Your understanding is correct. Messages can be persistent. Subscribers can be durable.
The specification is somewhat loose on non-persistent messages being sent to an inactive durable subscriber. First of all anything that is non-persistent is already a candidate for being dropped at anytime. Having said that, it is anti-social to drop messages, even for inactive durable subscribers.
Mileage varies by vendor though. Check for yourself to be sure.

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