As part of jake/nashorn fix JDK-8144568: ant clean test fails with jake/nashorn after recent sync with jdk9-dev, Context.fromClass has been changed to catch exception from Class.getClassLoader call. [ because there were test failures in jake/nashorn due to exception being not caught ]. Although this issue is not reproduced in jdk9-dev, we'd like to get the change in jdk9-dev/nashorn as well.

This is because:

1) future merge from jdk9-dev -> jake would be simpler (same code in that method)

2) Class.getClassLoader to get current Context is just an optimization. Even if that fails (say when jake merges to jdk9-dev eventually), we still need to fallback to get current Context thread local storage -- and not throw exception from Context.fromClass method.