How to terminate a JBPM processInstance

Question

Hi all

I'm using JBPM 4.3 and trying hard to find a way to terminate one processInstance.

First I simply used something like:

executionService.endProcessInstance(processInstanceID, "active");

However I got exception thrown out.

"exception while executing command org.jbpm.pvm.internal.cmd.EndProcessInstance

java.lang.NullPointerException"

Then I googled to find this post http://community.jboss.org/thread/146478, which didn't seem to give a resolution. I tried nevertheless to end all executions of the processInstance by calling

((ExecutionImpl) execution).end();

But the same exception was thrown again when I finally try to call executionService.endProcessInstance(processInstanceID, "active");

Did anyone have the same experience and solution?