Obviously creation of ProcessInstances involves the database. I've looked up 
the ProcessInstance constructor:

  public ProcessInstance(ProcessDefinition processDefinition, Map<String, 
Object> variables, String key)
  |   {
  |     [...]
  |     // if this process instance is created in the context of a persistent 
operation
  |     Services.assignId(this);
  |     [...]
  |   }
  | 
You are surely operating in the context of a persistent operation so this call 
to this static method of Services (I guess these are the services from the 
jbpm.cfg.xml) will do some Hibernate stuff.

Since jBPM heavily relies on a database for everything (transaction safety, 
logging, ...) I would guess that it will be hard to work around that by other 
means than by crude hacks.

Volker

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