RFR: 4619075: (ch) newChannel() should return Gathering/ScatteringByteChannel [v2]

[Brian Burkhalter]

On Wed, 13 Oct 2021 16:44:32 GMT, Joe Darcy <darcy at openjdk.org> wrote:

>> src/java.base/share/classes/java/nio/channels/Channels.java line 271:
>> 
>>> 269:      * @return  A new readable byte channel
>>> 270:      */
>>> 271:     public static ScatteringByteChannel newChannel(InputStream in) {
>> 
>> This looks like a binary incompatible change, are you sure that existing code won't fail at runtime with NoSuchMethodError?
>
> Right; covariant overrides are only compatible for instance methods, not static methods.

I added a number of non-static covariant overrides to `MappedByteBuffer` previously and so overlooked the static issue here.

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PR: https://git.openjdk.java.net/jdk/pull/5922