Check JDK7 compatibility

[cowtowncoder]

Rebuilding on jdk7 java package today it looked like there were unexpected test failures. So it'd make sense to resolve those.

[cowtowncoder]

Yup, 2 failures caused by addition of static methods, fields in core JDK classes; tests should be made more robust here...

[cowtowncoder]

Fixed JDK 1.7 test issues.