> Please review this PR which improves the safety of equality checking for 
> DecimalFormatSymbols.
> 
> DecimalFormatSymbols via its setters, allows certain instance variables to be 
> set as null. (Note that some variables are allowed to be null, and others are 
> not.) However, non null safe comparisons are used for all variables during 
> the equality check. This can lead to an unexpected NPE when 
> `DecimalFormatSymbols.equals()` is invoked.
> 
> The nullable variables in question should be equality checked via the static 
> `Object.equals()`. An associated regression test is added to confirm the 
> change.

Justin Lu has updated the pull request incrementally with one additional commit 
since the last revision:

  address Chen's comment - provide a NPE setter whitelist in test

-------------

Changes:
  - all: https://git.openjdk.org/jdk/pull/21315/files
  - new: https://git.openjdk.org/jdk/pull/21315/files/9bcf8996..bd6b021c

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=21315&range=01
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=21315&range=00-01

  Stats: 74 lines in 2 files changed: 49 ins; 20 del; 5 mod
  Patch: https://git.openjdk.org/jdk/pull/21315.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/21315/head:pull/21315

PR: https://git.openjdk.org/jdk/pull/21315

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