Would you please review the patch for below bug? bug: https://bugs.openjdk.java.net/browse/JDK-8153543 webrev: http://cr.openjdk.java.net/~mli/8153543/webrev.00/
Root cause: between "TestLibrary.getUnusedRandomPort()" and "UnicastRemoteObject.exportObject(impl, 0);", there is time window, interloper might step in and get the port. Solution: use port 0 to create server socket in RMI socket factory, then pass the exact port back.
Thank you -Hamlin