[rules-users] Test for element in an arraylist

Hello everyone, I got a problem with my rule. To keep it simple here's the code: global java.util.ArrayList odmList rule "Combine ODMAnswers" when $a1:ODMAnswer( ) $a2:ODMAnswer( ) eval(odmList contains $a1 && odmList contains $a2) then ODMAnswer answer = new ODMAnswer( ); odmList.add(answer); odmList.remove($a1); odmList.remove($a2); end So why do I get an error message looking like this: Rule Compilation error Syntax error on token "contains", invalid AssignmentOperator odmList.$a2 cannot be resolved or is not a field Syntax error on token "contains", . expected Thanks to everyone who reads this. Bojan