migration to Nexus 3.71 API

[stklcode]

Update the plugin structures and formats to latest Nexus 3.71 changes, i.e. drop OrientDB support, migrate to fluent API.

TODO:

• add DAOs to store data with H2/PostgreSQL backends
• add browse module
• migration of recipes and handlers for hosted Composer
• migrate proxy Composer
• migrate group Composer
• update unit tests
• update integration tests
• cleanup
• feature: implement packages/list.json for hosted repository

Run-tested all 3 repository types in a local Nexus 3.71.0-06 container (Java 17, H2)

---

This is based on #154. Resolves #157

[stklcode]

ping @bhamail

Could you have a look at this (or name someone who can)?
CI requirements are misconfigured (underscores vs. hyphens in job name) and he CLA bot is not running 🤷 But the (modified) tests succeed.

I know this is quite a breaking change, but I guess NXRM 3.71 is breaking for almost any plugin. We might want to add a migration utility 🤔
Few people have already given feedback to snapshot builds and there is also little discussion about further changes. But first place we'd like to see the plugin working agein (discussion in #157)

[bhamail]

I am NOT a Nexus Repository expert, so please test these changes thoroughly to make sure they work well for you.

It is really great to see this contribution!!! There are lot's of community repo format plugins that could benefit from this sort of update to the new DB hotness. Thanks for diving into the deep end!

Another thought: It might be worth adding some documentation that states the current version of the Composer plugin ONLY works with NXRM v3.71+ or whatever. That way, people on older versions hopefully don't upgrade themselves into a bad place by accident. (There are likely to be a lot of upgrade challenges with the DB changes, and anything we can do to minimize that sort of pain is good(tm) ).

[bhamail]

Not certain about the Java rules going forward, but I think maybe Java 8 actually stops being supported after NXRM 3.70. See "Java" https://help.sonatype.com/en/sonatype-nexus-repository-system-requirements.html

This gets messy fast.

Maybe add a link to the docs in the comment. At some point, we probably want to PREVENT the use of Java 8...

[stklcode]

This is just the JDK version required to build the plugin, not necessarily the same as the runtime requirement.

I’d be happy to raise this to 11 or 17. We could also clean up quite a few lines then.

[stklcode]

I am NOT a Nexus Repository expert, so please test these changes thoroughly to make sure they work well for you.

Anyway thanks very much for your review.
I’m testing this on my backup instance and few people here also tested my snapshot builds (feedback already included in the code).

Another thought: It might be worth adding some documentation that states the current version of the Composer plugin ONLY works with NXRM v3.71+ or whatever. [...]

Updated the README, including a notice on NXRM compatibility, added Java 17 and updated some broken links.

[3v01ut10n]

Thanks for the new version, it allowed me to update my Nexus

[stklcode]

Hmm, I thought I fixed the integration tests. Unfortunately the tests are passing locally, but not in CI.

[ERROR] Errors: 
[ERROR]   ComposerProxyIT.providersURLChangedToNXRM » ClassNotFound org.sonatype.nexus.testsuite.testsupport.RepositoryITSupport not found by PAXEXAM-PROBE-283c035a-7258-4d01-a77b-293598258c42 [108]
...

Update:

Got it! Had to add the -features.xml explicitly to Maven dependencies, s.t. it gets resolved during build and Pax Exam can pick it up.

    <dependency>
      <groupId>org.sonatype.nexus.testsuite</groupId>
      <artifactId>nexus-repository-testsupport</artifactId>
      <version>${nxrm-version}</version>
      <classifier>features</classifier>
      <type>xml</type>
      <scope>test</scope>
    </dependency>

The hint was

*SYSTEM org.sonatype.nexus.extender.NexusContextListener - Missing: nexus-repository-testsupport/3.71.0-06

in nexus-repository-composer-it/target/it-data/1/nexus3/log/nexus.log and corresponding some artifact resolving errors.