[Resttemplate] Filter out problem+json mime type from JSON mime types

[ajeans]

Fast tracked into the Accept header (resttemplate)

See full details at issue #7141
The issue is that the Accept header may use a single mime type rather than all mime types advertized in the spec if it is a JSON mime type.
However, application/problem+json qualifies as a JSON mime type so is fast tracked, but a standard server (e.g. spring boot) will reject a request that only accepts the error responses and not the standard responses.

PR checklist

• Read the contribution guidelines.
• Pull Request title clearly describes the work in the pull request and Pull Request description provides details about how to validate the work. Missing information here may result in delayed response from the community.
• If contributing template-only or documentation-only changes which will change sample output, build the project beforehand.
• Run the shell script ./bin/generate-samples.shto update all Petstore samples related to your fix. This is important, as CI jobs will verify all generator outputs of your HEAD commit as it would merge with master. These must match the expectations made by your contribution. You may regenerate an individual generator by passing the relevant config(s) as an argument to the script, for example ./bin/generate-samples.sh bin/configs/java*. For Windows users, please run the script in Git BASH.
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[ajeans]

CC Java Technical Committee @bbdouglas (2017/07) @sreeshas (2017/08) @jfiala (2017/08) @lukoyanov (2017/09) @cbornet (2017/09) @jeff9finger (2018/01) @karismann (2019/03) @Zomzog (2019/04) @lwlee2608 (2019/10) @bkabrda (2020/01)

[wing328]

@ajeans thanks for the PR. Can you please run ./bin/utils/ensure-up-to-date to update the samples so that the CI can verify the result?

[ajeans]

@wing328 I just ran the script, but there is nothing to commit after the script ran...

[...]
# START SCRIPT: ./bin/utils/export_generator.sh typescript-aurelia
# START SCRIPT: ./bin/utils/export_generator.sh typescript-fetch
# START SCRIPT: ./bin/utils/export_generator.sh typescript-inversify
# START SCRIPT: ./bin/utils/export_generator.sh typescript-node
# START SCRIPT: ./bin/utils/export_generator.sh typescript-redux-query
# START SCRIPT: ./bin/utils/export_generator.sh typescript-jquery
Executed /home/arnaud/workspace/oss/openapi-generator/bin/utils/export_docs_generators.sh successfully!
Starting /home/arnaud/workspace/oss/openapi-generator/bin/utils/copy-to-website.sh ...
# START SCRIPT: ./bin/utils/export_generator.sh typescript-rxjs
# START SCRIPT: /home/arnaud/workspace/oss/openapi-generator/bin/utils/copy-to-website.sh
Wrote /home/arnaud/workspace/oss/openapi-generator/docs/conduct.md
Wrote /home/arnaud/workspace/oss/openapi-generator/docs/contributing.md
Executed /home/arnaud/workspace/oss/openapi-generator/bin/utils/copy-to-website.sh successfully!
Starting /home/arnaud/workspace/oss/openapi-generator/bin/utils/export_generators_readme.sh ...
# START SCRIPT: /home/arnaud/workspace/oss/openapi-generator/bin/utils/export_generators_readme.sh
Wrote /home/arnaud/workspace/oss/openapi-generator/docs/generators.md
Executed /home/arnaud/workspace/oss/openapi-generator/bin/utils/export_generators_readme.sh successfully!
Git working tree is clean

[ajeans]

Oh right, PEBKAC, I had a stale openapi-generator-cli.jar and ./bin/utils/ensure-up-to-date didn't recreate it anew

Llooking into this, it should have been refreshed by the mvn invocation in bin/generate-samples.sh... weird, will look if I can recreate...

Anyway @wing328 , looks good to me now, rebased on top of master, original commit first on top, then the sample changes...

[ajeans]

And a third commit on top to make sure we use the same method as before.

Spring resttemplate has a isJsonMime(String) and a isJsonMime(MediaType)), keep using the isJsonMime(MediaType) variant

[wing328]

@ajeans thanks for the PR, which looks reasonable to me.