[Illniyar]

That's not the all story. Sun/Oracle refused to provide the TCK with a license that would allow it to be used in mobile. They did agree to allow it to be a desktop/server only solution.

However the knowledge that Java isn't open-source compatible in mobile environments was known before Google started building their own.

[kodablah]

It should also be noted that now the policy is to not grant a TCK to any open source implementation that is not an OpenJDK derivative.