Hi, Java objects are treated "as is" in nashorn. i.e., Nashorn uses wrapperless Java object access. So, Java objects are *not* ECMAScript objects. Dynamic property addition, prototype manipulation etc. won't work on Java objects.
But, you can create a helper ECMAScript object whose properties are bound to the properties of a Java object. You can use Object.bindProperties extension for this [ https://wiki.openjdk.java.net/display/Nashorn/Nashorn+extensions#Nashornextensions-Object.bindProperties ] Example: var props = java.lang.System.properties; var obj = Object.bindProperties({}, props); // create a new script object and bind it's properties to that of Java object Object.getOwnPropertyNames(obj).forEach(function(val) { print(val) }); Note that Java Maps are treated as 'special' in that keys can be used as properties. [ https://wiki.openjdk.java.net/display/Nashorn/Nashorn+extensions#Nashornextensions-JavaMapkeysasproperties ] That also could be used to provide script friendly return object from your Java code. Hope this helps, -Sundar On 6/1/2016 1:53 AM, yikes aroni wrote: > So from a javascript function i call a java method that returns a java > object. What gets returned is not a simple bean. It has properties and > methods on it. > > var xxx = MyJavaClass.getMeSomething(); > > The *typeof* xxx is "object" according to Nashorn. However, when i try to > do things with it -- as if it were a Javascript object -- I get the message > > TypeError: testSample is not an Object > > Is there something specific i need to do to be able to manipulate xxx as a > javascript object? For example, I want to be able to add properties and > functions to it > > xxx['someProp'] = 3.14; > xxx['someFn'] = function() { > print('hello!'); > } > > I want to be able to get stuff from it > > Object.getOwnPropertyNames(xxx).forEach(function(val) { print(val) }); > > Stuff like that... but i can't because it's not seen as a native JS > "object" > > thanks. I hope i am clear.
