GH-2199 exclude jackson dependencies from POM

[barthanssens]

GitHub issue resolved: #2199

Briefly describe the changes proposed in this PR:

• exclude jackson dependencies from rio-api

(I added the json-ld java to support user-specified DocumenLoader a few releases ago, but forgot to exclude the unused dependencies)

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PR Author Checklist:

• my pull request is self-contained
• I've added tests for the changes I made
• every commit message starts with the issue number (GH-xxxx) followed by a meaningful description of the change
• every commit has been signed off

Note: we merge all feature pull requests using squash and merge. See RDF4J git merge strategy for more details.

[abrokenjester]

I'm not sure I understand the change to be honest. Are you saying you can run the jsonld-java parser/writer without having these jackson libraries available? If so, what does jsonld-java use to (de)serialize json?

Edit never mind, I realize now that you are only using the jsonld-java dependency in rio-api to get access to one particular interface/class, not to actually run the tool, so you don't need its third party deps here.

[abrokenjester]

LGTM. I'm on the fence whether we should really count this as incompatible - arguably it fixes a bug in our dependency structure and I don't quite count relying on buggy behavior as something we should provide compatibility for. Though I realize that if you stretch that reasoning you can call any change a bug :)

[barthanssens]

It's a feature ! :-)
I don't really mind to merge it into the next 3.3 version instead of 4 (though in that case it's probably wise to add a small comment to the release notes)

[abrokenjester]

I don't really mind to merge it into the next 3.3 version instead of 4 (though in that case it's probably wise to add a small comment to the release notes)

Excellent idea. That also ties in with something @hmottestad suggested earlier: that we start early on writing our release notes, so that we can all contribute to them. I'll put up a PR on rdf4j-docs with a new draft for the 3.3 release notes, and we can all push to that branch as we go along making further changes.