Register a custom type converter (is it possible)?

[Paulo Lopes]

Hi,


I've been reading the documentation, wiki and the examples from Nashorn and
have a question that I cannot find a yes/no answer to. Say for example that
I've an application that leverages on Nashorn for JavaScript execution but
its core is in Java. In my Java code I've a interface like:

interface Foo {

  void doSomething(Bar bar);

}


Now from Nashorn I'd like to invoke the method "doSomething" like:


foo.doSomethin({key: 'value'});


As expected this won't work since Nashorn does not know how to cast from
"JSObject" to "Bar" however I'd like to register somewhere/somehow (this is
what I don't know) a helper class/method/something where I could do this. I
also do not want to bring Nashorn API/types to Java to I'm not looking for
something like:


class Bar implements JSObject { ... }


Is this possible? and it is possible with JDK8?


Thanks!
Paulo