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EVALUATION
The fix in 7u4 is almost identical to that of 8, except that CacheTable is not changed. There is these suspicious lines
// re-insert the entry, since rc.put could have removed the entry
super.put(principal, rc);
I cannot find a reason why the entry should be re-inserted, but since this is an update release, they are kept untouched for safety.
BTW, the fix in JDK 8 looks like
http://hg.openjdk.java.net/jdk8/tl/jdk/rev/e8e08d46cc37