GWT has been doing this for Java for years and works very well. In fact I'd jump ship to any technology that can do what GWT does, i.e. a solid server-side lang

GWT has been doing this for Java for years and works very well. In fact I'd jump ship to any technology that can do what GWT does, i.e. a solid server-side language that you can also write the client in, with a large mature ecosystem. Keeping an eye on Dart.