Yash,

you receive the NPE because you don't have an actors attribute in your mail 
action. In the docu, 16.1.1 it says

anonymous wrote : There are two attribute to specify recipients: actors and to. 
The to attribute should resolve to a semicolon separated list of email 
addresses. The actors attribute should resolve to a semicolon separated list of 
actorIds. Those actorIds will be resolved to email addresses with by means of 
address resolving.

Although to me it sounds more like one has to specify actors OR to, if you look 
at the code both are getting checked. I've tried with your process, altered 
only this
<mail name="M_MailAction"  to="[EMAIL PROTECTED]" actors="ernie" 
template="jbpm.mail.templates.xml">
and I don't get an error.

Martin

btw, regarding your JIRA entry, not only the hibernate mapping for 
org.jbpm.graph.action.MailAction is missing, but also for 
org.jbpm.graph.node.MailNode

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