Hi Huisheng
I tried the method you mentioned in the ExecutionImpl but I didn't know how to commit the Execution.
My Test is :
processInstance = executionService.startProcessInstanceByKey("Normal");
((ExecutionImpl)processInstance).createVariable("test", "valuetest","string",true);
Nothing is created in the DB
What about the Service APIs , No APIs to enable the variable history ?
Any news about the next jBPM release 4.4 ?