Re: JsInterop and Java collections?

As Thomas, says it will be impossible to support passing any of the collection interfaces directly through to JS code. You might think however, that you could change the implementation of ArrayList to actually be a JS Array. I don't think this is possible because an instance ArrayList needs to fulfill the Java contract of being able to know which interfaces it implements. This is done by having special meta data attached to the object prototype. The minute you start touching the Array prototype you have the potential of incompatibility with existing JS code.

Having said that, it is totally possible to have a native JS array Interop interface provide an adapter to make it look like a List. Below is a very hacky way to do it using the Array interface I defined.

private native <E> List<E> asList(Array<E> a) /*-{      l = @java.util.ArrayList::new()()      l.@java.util.ArrayList::array = a;      return l;  }-*/;

    Array<String> jsArray = Array.create();
      jsArray.push("val1");      jsArray.push("val2");
      List lArray = asList(jsArray);

      lArray.add("val3");      jsArray.push("val4");

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