FileInputStream and FileOutputStream use ThreadLocal to communicate
information from finalize() to close(). This is slow and ugly.
Generally, use of ThreadLocal is considered a last resource.
Here's a code sketch of a cleaner solution:

Instead of
 
    private final Object closeLock = new Object();
    private volatile boolean closed = false;
    private static final ThreadLocal<Boolean> runningFinalize =

use

private final static int OPEN = 0;
private final static int RUNNING_FINALIZE = 1;
private final static int CLOSED = 2;
AtomicInteger state = new AtomicInteger(OPEN);

and then CAS state in an infinite loop in the state-changing methods.

e.g.

void close() {
  for (;;) {
     int st = state.get();
     if (st == CLOSED) return;
     boolean runningFinalize = (st == RUNNING_FINALIZE);
     ...
     if (state.compareAndSetState(st, CLOSED)).... return;
  }
}

This does not require locking to manage state transitions.