Created attachment 826039 [details]
Maven project with reproducer

Description of problem:

When using declarative agenda with RETE, the following ClassCastException is thrown:

java.lang.ClassCastException: org.drools.reteoo.common.ReteWorkingMemoryEntryPoint cannot be cast to org.drools.core.common.InternalWorkingMemoryEntryPoint
	at org.drools.reteoo.common.ReteAgenda.insertAndStageActivation(ReteAgenda.java:371)
	at org.drools.reteoo.common.ReteAgenda.addActivation(ReteAgenda.java:388)
	at org.drools.reteoo.nodes.ReteRuleTerminalNode.assertLeftTuple(ReteRuleTerminalNode.java:47)
	at org.drools.core.reteoo.SingleLeftTupleSinkAdapter.doPropagateAssertLeftTuple(SingleLeftTupleSinkAdapter.java:213)
	at org.drools.core.reteoo.SingleLeftTupleSinkAdapter.createAndPropagateAssertLeftTuple(SingleLeftTupleSinkAdapter.java:153)
	at org.drools.reteoo.nodes.ReteLeftInputAdapterNode.assertObject(ReteLeftInputAdapterNode.java:44)
	at org.drools.core.reteoo.SingleObjectSinkAdapter.propagateAssertObject(SingleObjectSinkAdapter.java:60)
	at org.drools.core.reteoo.CompositeObjectSinkAdapter.propagateAssertObject(CompositeObjectSinkAdapter.java:369)
	at org.drools.core.reteoo.ObjectTypeNode.assertObject(ObjectTypeNode.java:288)
	at org.drools.core.reteoo.EntryPointNode.assertObject(EntryPointNode.java:260)
	at org.drools.core.common.NamedEntryPoint.insert(NamedEntryPoint.java:360)
	at org.drools.core.common.NamedEntryPoint.insert(NamedEntryPoint.java:279)
	at org.drools.core.common.AbstractWorkingMemory.insert(AbstractWorkingMemory.java:1149)
	at org.drools.core.common.AbstractWorkingMemory.insert(AbstractWorkingMemory.java:1093)
	at org.drools.core.impl.StatefulKnowledgeSessionImpl.insert(StatefulKnowledgeSessionImpl.java:308)
	at org.drools.reteoo.DeclarativeAgendaTest.testActivationBlock(DeclarativeAgendaTest.java:35)

Using PHREAK, the test passes.

Version-Release number of selected component (if applicable):

Drools 6.0.0-SNAPSHOT
BRMS 6.0.0 ER4

How reproducible:

Run DeclarativeAgendaTest from the attached Maven project with setting drools engine to RETE:

mvn clean test -Dtest=DeclarativeAgendaTest -Ddrools.ruleEngine=reteoo

The test passes, when executed with PHREAK:

mvn clean test -Dtest=DeclarativeAgendaTest -Ddrools.ruleEngine=phreak

Actual results:

The test fails.

Expected results:

The test passes (as it does with PHREAK).