[jboss-user] [JBoss Seam] - dvd example - get process instance from order id question

[jbpmndc]

In the dvd example a process instance is retrieved using an entity bean's id.  Is jBPM aware of all entity beans or how is it aware that there is a process that has an orderId of x value? 

ProcessInstance pi = (ProcessInstance) context.getSession()
  |               .createQuery("select pi from LongInstance si join si.processInstance pi " +
  |                           "where si.name = 'orderId' and si.value = :orderId")
  |               .setLong( "orderId", order.getOrderId() )
  |               .uniqueResult();

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