org.drools
Interfaces 
FactHandle
RuleBase
Visitor
WorkingMemory
Classes 
DroolsTestCase
MockTuple
MockWorkingMemory
RuleBaseBuilder
Exceptions 
AssertionException
DroolsException
FactException
NoSuchFactHandleException
NoSuchFactObjectException
RetractionException
RuleIntegrationException
RuleSetIntegrationException