phil_spratt,
urmas is right. You should be using the MSP Interface/Schedule Connect bundled with your Clarity version (you have to download it from Home > Account Settings > Software Download). v12 and v13.2 MSP interfaces are different so please do not mix.
Regarding your question with Java, v12 Schedule Connect comes with its own Java 6, but for v13.2, it will be necessary to use Java 7. Starting from Clarity v13.3, Schedule Connect installs its own private JRE so it doesn't interfere with any other Java version on the computer.
Hope this helped