when invoking the signal method, the process will start executing and this method only
returns after the process has entered a new wait state. potentially this means that many
nodes are executed in the mean time.
all of this is inside 1 transaction of the caller of the signal method.
asynchronous continuations lets you execute the process till a certain point (the node
marked with async=true) in the caller's transaction. then jbpm will take care of
resuming the execution in a separate transaction. this involves sending an asynchronous
message in the caller's transaction to a job executor. the job executor will start a
new tx and resume the execution starting by execting the node with async=true
let us know if this explanation is better then in the user guide, then we update it :-)
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