Eclipse won't compile, bad class file, wrong version

Question

I am trying to compile code checked out of SVN from another developer. Eclipse has been giving me a lot of trouble lately.

Here are my project-specific settings:

Answer 1

Changing the tools.jar in eclipse to the correct version fixed it. I was using jre 1.6 and had to change it to use 1.8 to get the class file in version 52.