Off topic; But since you work at Oracle, what is the Oracle copyright terms on alternative implementations of Java? (in the light of Android lawsuits). Eg: some research or commercial implementation for a subset of java etc?
What do you mean by "alternative implementations"? OpenJDK is 100% open source, and is entirely governed by its open-source license. You can do whatever you want with -- including take just big or small pieces from it and change them -- it as long as you comply with the license. If you want to use the name "Java", your software must pass the TCK.
No. By alternative implementation I meant eg: some experimental java compiler to a different target eg: say JS / wasm, or a memory efficient class library implementation etc..
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).
