Protobuf support classes all implement getMessageBuilder()

[dsyer]

Many of the Protobuf* support classes in spring-web have a private static getMessageBuilder() that is not exposed or shared. They could extract it into a utility to make them slightly more consistent/efficient. It would also be quite handy to be able to re-use that code without copy-pasting in other places.

[cfcromn]

Hi, I’d be interested in working on this.
I found the duplicated getMessageBuilder() logic and separate method caches in ProtobufHttpMessageConverter, ProtobufDecoder, and ProtobufJsonDecoder.
Would you prefer this to be extracted as a public reusable utility, or kept as an internal shared helper?

[bclozel]

@cfcromn this issue is not triaged yet, we're not interested in contributions at this time.

[github-actions]

Fixed via 76239d0