This is a simple export/import backport for6566891: RMIConnector: map value referencing map key in WeakHashMap prevents map entry to be removed
bug: https://bugs.openjdk.java.net/browse/JDK-6566891 jdk 8 changeset: http://hg.openjdk.java.net/jdk8/tl/jdk/rev/2d51653d9b4bjdk 8 review: http://mail.openjdk.java.net/pipermail/serviceability-dev/2013-August/011229.html
Thanks, Shanliang