Litigation!

But Java is open source, how can this be . Because you have all been fooled by Sun. Java JRE and JDK have been open sourced, but the specification was never "open".

Java's spec is still very much closed - not even governed by a recognized standards body. If it had been laid out to ISO or ECMA with a proper patent protection (like MS did with C#) this would not be possible.

But it wasn't, so it is.