JavaScript interface returns null instead of false for Booleans --------------------------------------------------------------- Key: ARQGRA-496 URL: https://issues.jboss.org/browse/ARQGRA-496 Project: Arquillian Graphene Issue Type: Bug Affects Versions: 2.1.0.Final Reporter: Vsevolod Golovanov {code} @JavaScript(value = "MyObject") public interface MyJsInterface { Boolean getSomeValue(); } {code} If in js MyObject.someValue === false, then attempting to get the value via Graphene's MyJsInterface will result in null getting returned, instead of false. If you declare a primitive boolean return type, then null will get silently 'casted' to false, but that's not something I want either. I want to distinguish the three states with Boolean. I want an exception for null with boolean. {code:title=call.js/invokeInterface} if (property && target[property]) { return target[property]; } {code} There are 2 problems here. # Instead of {{target\[property\]}} there should be an explicit {{typeof(target\[property\]}) !== 'undefined')}} check (or {{property in target}}, if you want to distinguish the "property is defined, but its value is undefined" case). # When invokeInterface doesn't find neither getter, nor setter, nor method it quits without returning or throwing anything. There should be some kind of explicit handling if it can't find property/method at all. The problem probably affects not only Booleans, but other types with falsey values too.