This issue is meant to be a portmanteau for all relics resulting from refactorings, modifactions, additions and deletions - in short, the flotsam and jetsam of ongoing software maintenance.

(.) There are two eponymous classes:
org.drools.base.DefaultConsequenceExceptionHandler
org.drools.runtime.rule.impl.DefaultConsequenceExceptionHandler
and, thrown from these:
org.drools.spi.ConsequenceException
org.drools.runtime.rule.ConsequenceException
Mark: "I believe it's historical,... drools-api has been there long enough that we can start to clean all this up now."

(.) Problem reported with
ksession.fireAllRules(new RuleNameEndsWithAgendaFilter("test"));
Thomas Swindells: Looks like [...] that there are two agenda filter classes:
org.drools.runtime.rule.AgendaFilter and
org.drools.spi.AgendaFilter.
The first one, odrr.AgendaFilter is what is required by the StatefulKnowledgeSession, this then wraps it in a class to convert it to an ods.AgendaFilter which is what the internal classes use. RuleNameEndsWithAgendaFilter seems to implement ods.AgendaFilter and not odrr.AgendaFilter which is what I'd expect - this is possibly a bug.