The current specs for the basic collections classes:

http://download.java.net/jdk8/docs/api/java/util/List.html#spliterator%28%29
http://download.java.net/jdk8/docs/api/java/util/Collection.html#spliterator%28%29
http://download.java.net/jdk8/docs/api/java/util/Set.html#spliterator%28%29

look like requiring all the subclasses to return SIZED spliterators while this may not be feasible or reasonable or make sense.

For example:
http://download.java.net/jdk8/docs/api/java/util/concurrent/ConcurrentSkipListMap.html#entrySet%28%29
may look as SIZED characteristic still should be present while it is not so.

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Another case - collection views of WeakHashMap don't report SIZED; consider the following code

System.out.println( new Hashtable().entrySet().spliterator().hasCharacteristics(Spliterator.SIZED));
System.out.println( new HashMap().entrySet().spliterator().hasCharacteristics(Spliterator.SIZED));
System.out.println( new WeakHashMap().entrySet().spliterator().hasCharacteristics(Spliterator.SIZED));

which will print out

true
true
false


The following JCK tests fail due to this case:
api/java_util/WeakHashMap/EntrySetSpliterator.html#EntrySetSpliterator[characteristics_SIZED]
api/java_util/WeakHashMap/EntrySetSpliterator.html#EntrySetSpliterator[hasCharacteristics_SIZED]
api/java_util/WeakHashMap/KeySetSpliterator.html#KeySetSpliterator[characteristics_SIZED]
api/java_util/WeakHashMap/KeySetSpliterator.html#KeySetSpliterator[hasCharacteristics_SIZED]
api/java_util/WeakHashMap/ValuesSpliterator.html#ValuesSpliterator[characteristics_SIZED]
api/java_util/WeakHashMap/ValuesSpliterator.html#ValuesSpliterator[hasCharacteristics_SIZED]