what is the preferred way to get a list of task instances in a given state?

I don't see a clear method on JbpmContext for doing something like this.  but 
it seems like you should be able to do a direct HQL query like

"from Token t where t.node.name = ?" 

is that seriously wrong, or is it ok?  

Relatedly, is there a best-practice for how to link domain model entities to 
process instances?  It seems like I could just add a ProcessInstance property 
to any old object if I'm using Hibernate already, and then do queries like

"from MyObject foo where foo.processInstance.rootToken.node.name = :state"

Is that the right way to use the tool, or would that be an abuse of the jBPM 
abstractions?

Thanks in advance,
-- Bill

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