Remember, copyright-issues by definition do not apply to clean-room implementations. For there to be a breach of copyright, one has to show that the copyrightab

Remember, copyright-issues by definition do not apply to clean-room implementations. For there to be a breach of copyright, one has to show that the copyrightable material (i.e., the source code) actually derives from the corresponding copyrightable material that Oracle owns. If it truly is a clean-room implementation, then the engineers responsible must never have looked at the original source code, making the claim moot. Patents are a whole different ball-game though.