MVEL appeared to be null pointer protected when it evaluated our rules ... at least until it got to a Boolean attribute. In every other instance when an value is null Drools skips over the rule ... however, I get the null pointer exception listed above when Drools goes to execute this rule and the getOwn_eaIsProposedInsuredIndAsBoolean method returns null. rule "EasyApp Owner Insert" ruleflow-group "insert-group" when $ea : EasyApp(!getOwn_eaIsProposedInsuredIndAsBoolean()) then insert($ea.getOwn_xmParty()); insert($ea.getOwn_xmAddress()); insert($ea.getOwn_xmRelation()); end Can anyone provide me some guidance?