The Java spec is not open source. You could either extract as much or as little from OpenJDK and comply with its open-source license or obtain a spec license if

The Java spec is not open source. You could either extract as much or as little from OpenJDK and comply with its open-source license or obtain a spec license if you don't wish to open-source your implementation. In other words, you have the open-source route or the closed source route, but the closed-source route isn't free. (BTW, I am not authorized to speak on behalf of anyone other than myself, so this is just my opinion).