ArrayList size not working properly in Drools 6.2

问题

I was using Drools 6.1 for rules development. I was using array list size() method in rule to check. i.e.

$x : X( list.size == 1) where list is an attribute of Collection type.

Now I migrated to Drools 6.2. However this condition is not working and rule is not getting fired. When I changed this rule as below,

$x : X( list.size > 0 , list.size < 2 ) , this rule is working fine.

Please have a look on this. Is there any issue in Drools 6.2 version.

Thanks Shorav

来源：https://stackoverflow.com/questions/32201760/arraylist-size-not-working-properly-in-drools-6-2