Specification for Collections.nCopies() says:

"Returns an immutable list consisting of n copies of the specified object."

However its iterator doesn't throw UOE, but throws ISE and calling of method removeIf(alwaysFalse) doesn't lead to the expected UnsupportedOperationException.

http://download.java.net/jdk8/docs/api/java/util/Collection.html#removeIf(java.util.function.Predicate)
"Throws:
UnsupportedOperationException - if the remove method is not supported by this collection's iterator()"


Please see the following code sample:

        final List<String> nCopies = Collections.nCopies(3, "a");

        try {
            nCopies.iterator().remove();
        } catch (UnsupportedOperationException uoe) {
            System.out.println("OK, remove method is not supported");
        } catch (Exception e) {
            System.out.println("e = " + e);
        }

        nCopies.removeIf( e -> false);


The output will be:

e = java.lang.IllegalStateException

The following JCK test will fail:
api/java_util/Collections/ncopies/RemoveIf.html#RemoveIf[elementRemovalNotSupported]