I can't get it to accept this LHS at all: when $ea : EasyApp((priBen_xmPartyList.size() != priBen_xmRelationList.size()) || (priBen_xmPartyList.size() != priBen_eaRelationshipNameList.size())) Description Resource Path Location Type BuildError: Unable to Analyse Expression priBen_xmPartyList.size != priBen_xmRelationList.size || priBen_xmPartyList.size != priBen_eaRelationshipNameList.size: [Error: unable to resolve method using strict-mode: com.onfs.easyapp.EasyApp.priBen_eaRelationshipNameList()] [Near : {... xmPartyList.size != priBen_eaRelationshipNameList. ....}] ^ [Line: 1, Column: 85] EasyApp.drl /TermXpressRules/src/main/rules line 243 Drools Error And, yes, they are all three lists: priBen_xmPartyList = new ArrayList<XmParty>(); priBen_xmRelationList = new ArrayList<XmRelation>(); priBen_eaRelationshipNameList = new ArrayList<String>(); -- View this message in context: http://drools.46999.n3.nabble.com/Strange-error-in-DRL-compiler-tp3582691... Sent from the Drools: User forum mailing list archive at Nabble.com.

there is a bug filed for this issue: https://issues.jboss.org/browse/JBRULES-3240 https://issues.jboss.org/browse/JBRULES-3240 -- View this message in context: http://drools.46999.n3.nabble.com/Strange-error-in-DRL-compiler-tp3582691... Sent from the Drools: User forum mailing list archive at Nabble.com.