git: openjdk/jdk: 8308167: SequencedMap::firstEntry throws NPE when first entry has null key or value

[Stuart Marks]

Changeset: 6d155a47
Author:    Stuart Marks <smarks at openjdk.org>
Date:      2023-06-06 00:19:50 +0000
URL:       https://git.openjdk.org/jdk/commit/6d155a47f13ff80cf7a9de363fc5ae2943b6603a

8308167: SequencedMap::firstEntry throws NPE when first entry has null key or value

Reviewed-by: bchristi

! src/java.base/share/classes/java/util/SequencedMap.java
+ src/java.base/share/classes/jdk/internal/util/NullableKeyValueHolder.java
! test/jdk/java/util/AbstractMap/SimpleEntries.java
! test/jdk/java/util/SequencedCollection/BasicMap.java