[rules-users] KnowledgeBuilderFactory.newKnowledgeBuilder(KnowledgeBase kbase) throws exception

[A. Craig West]

I had some issues getting my codebase to work in Drools 5.6.0 (it
worked in 5.5) so I am now trying the legacy api with 6.0.1Final.
When I call:
KnowledgeBuilderFactory.newKnowledgeBuilder(KnowledgeBase kbase)
I get an exception:
java.lang.ClassCastException:
org.drools.impl.adapters.KnowledgeBaseAdapter cannot be cast to
org.drools.core.impl.KnowledgeBaseImpl