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I made the problem go away but I don't understand why. I have a rule that updates a field in a process variable pojo.

rule "applicationReady"

    ruleflow-group "assignApplication"

    when

        $process: WorkflowProcessInstance();

        $vars :PIvars() from (PIvars)$process.getVariable("vars");

        eval($vars.getAppId() == 0);

    then

    System.out.println("!!Begin firing rule applicationReady " + $vars);

       $vars.setApplicationReady(true);

#       $process.setVariable("vars", $vars);

    System.out.println("!!End firing rule applicationReady"  + $vars);

end

Commenting out $process.setVariable("vars", $vars); works with both JPA and without. My pojo is inserted as a Fact. Salaboy's example

rule "New Ambulance for Heart Attack Emergencies"

    ruleflow-group "select_vehicle"

    when

        $process: WorkflowProcessInstance()

        Emergency(type == "Heart Attack") from $process.getVariable("emergency")

    then

        System.out.println("A new Ambuance is being created!");

        Ambulance ambulance = new Ambulance("MyAmbulance");

        ((WorkflowProcessInstance)kcontext.getKnowledgeRuntime().getProcessInstance($process.getId())).setVariable("vehicle", ambulance);

        insert(ambulance);

end

Creates a new pojo, where mine just sets a field variable and in my case I'm not sure what is the reliable way to do it.