Hi, could you please report this at https://bugreport.java.com/bugreport/ (please also first search at https://bugs.openjdk.org/issues?jql=project%3DJDK%20AND%20issuetype%3DBug whether it has already been reported).
This also seems to affect the `CheckedEntrySet`; would be good if you could mention that in your report as well. I think the easiest reproducers for this can be created with an empty map: ``` Collections.unmodifiableMap(Map.of()).entrySet().iterator().forEachRemaining(null) Collections.checkedMap(Map.of(), String.class, String.class).entrySet().iterator().forEachRemaining(null) ``` Per specification both calls should throw a NullPointerException, but they don't throw it. Might also be worth recommending to the JDK authors to perform the null check in the internal `entryConsumer` method to avoid having it repeated 4 times, once for each caller. The `CheckedEntrySet` would still need a separate null check though. Kind regards
