Is there anything that would trigger the deletion of all of the rows in the JBPM4_HIST_* tables? Would deploying the same process definition (name, key, id) multiple times to the same repository service delete the history rows? I have not defined a transaction manager (I am using the all of the default configuration files); therefore, I am assuming it isn't a matter of the data not being commited which I assumed was done when I call...

executionService.endProcessInstance(processInstanceId, "end");

where 'end' is defined as...

<end name='end'></end>

Thanks in advance!