clojure.java.io/resource assumes the current Thread's context ClassLoader will be non-null. if the Thread's context ClassLoader is null then it NPEs
(resource n (.getContextClassLoader (Thread/currentThread)))
the javadocs indicate it may reasonably be null, and i'm seeing a case in the wild where it's non-null - https://docs.oracle.com/javase/8/docs/api/java/lang/Thread.html#getContextClassLoader--
clojure.java.io/resource should perhaps default to using (ClassLoader/getSystemClassLoader) when the context ClassLoader is null
