Continuing trying to upgrade from drools 5.1 I've been finding some strange funnies in rules behavior. Currently I'm using <droolsVersion>5.3.0.Beta1</droolsVersion> <jbpmVersion>5.1.0.Final</jbpmVersion> <mvelVersion>2.1.Beta6</mvelVersion> In our model we've got some lists (Yuck I know) and we want to test whether they are not empty, there are three variations of the rules that we could use rule "TESTa" when t : Title(t.getMyList().isEmpty() == false) then logger.debug(drools.getRule().getName() + " " + drools.getTuple()); end rule "TESTb" when t : Title(myList.isEmpty() == false) then logger.debug(drools.getRule().getName() + " " + drools.getTuple()); end rule "TESTc" when t : Title(myList.empty == false) then logger.debug(drools.getRule().getName() + " " + drools.getTuple()); end I'd expect all of these formats to work (particularly c) however only TESTa succeeds, the other two FAIL SILENTLY, failing to match anything but not generating any errors or warnings. Thomas ________________________________ ************************************************************************************** This message is confidential and intended only for the addressee. If you have received this message in error, please immediately notify the postmaster(a)nds.com and delete it from your system as well as any copies. The content of e-mails as well as traffic data may be monitored by NDS for employment and security purposes. To protect the environment please do not print this e-mail unless necessary. NDS Limited. Registered Office: One London Road, Staines, Middlesex, TW18 4EX, United Kingdom. A company registered in England and Wales. Registered no. 3080780. VAT no. GB 603 8808 40-00 **************************************************************************************