Rules evaluating facts not fired in OSGi environment

Issue

We are deploying a bundle which uses the KIE API to execute the Drools engine. This works for simple rules, but any rules which are based on a Fact class fail to fire.

This is our java code:

    KieServices services = KieServices.Factory.get();
    ReleaseId rid = services.newReleaseId("org.kie.example", "project1", "1.3.0");
    KieContainer container = services.newKieContainer(rid);
    KieSession ksession = container.newKieSession();
    Person person=new Person();   
    ksession.insert(person);
    int ruleFired=ksession.fireAllRules();

And this is the rule which should be fired:

rule "Person"
    when
        Person()
    then
        System.out.println("A person exists");
end