[BUG] Java 15: DecimalFormatSymbols overrides equals but not hashCode

[Joe Darcy]

Note that we've had the javac warning about equals and hashCode 
overriding as a fatal build condition since at least JDK 9.

-Joe

On 9/15/2020 12:36 PM, Brian Burkhalter wrote:
> Hello,
>
> The override of hashCode() looks like it is still there in JDK 15 [1]. I don’t know however why it does not appear as such in the javadoc [2].
>
> Brian
>
> [1] http://hg.openjdk.java.net/jdk/jdk15/file/fb7064dc63f9/src/java.base/share/classes/java/text/DecimalFormatSymbols.java#l760
> [2] https://docs.oracle.com/en/java/javase/15/docs/api/java.base/java/text/DecimalFormatSymbols.html
>
>> On Sep 15, 2020, at 12:14 PM, Rob Spoor <openjdk at icemanx.nl> wrote:
>>
>> In Java 14 and before, DecimalFormatSymbols had overrides for both equals and hashCode. In Java 15, the override for hashCode has disappeared, and it now inherits hashCode from java.lang.Object. That means it now violates the contract for equals + hashCode: two equal DecimalFormatSymbols instances can have different hash codes.