I'm running into this exact exception today trying to implement process migration via: WorkflowProcessInstanceUpgrader.upgradeProcessInstance()
During the migration, a call is made to getProcess() within ProcessInstanceImpl:
| public Process getProcess() { |
| | if (this.process == null) { |
| | this.process = kruntime.getKnowledgeBase().getProcess(processId); |
| | } |
| | return this.process; |
| } |
kruntime is null internally.
Based on a different poster's experience I tried removing Bitronix as the transaction manager by commenting out the following:
env.set(EnvironmentName.TRANSACTION_MANAGER, TransactionManagerServices.getTransactionManager());
I "think" it works, but I get an error further along in the conversion about being unable to cast CommandBasedStatefulKnowledgeSession to InternalKnowledgeRuntime.
Not sure if this is helpful to you...