Dawid Weiss commented on LUCENE-9077:

No problem, Robert, thanks. I didn't touch it yet simply because there are too 
many things to do at once and I wanted to push things out the door in the open 
but I will get to this. 

> Gradle build
> ------------
>                 Key: LUCENE-9077
>                 URL: https://issues.apache.org/jira/browse/LUCENE-9077
>             Project: Lucene - Core
>          Issue Type: Task
>            Reporter: Dawid Weiss
>            Assignee: Dawid Weiss
>            Priority: Major
>             Fix For: master (9.0)
> This task focuses on providing gradle-based build equivalent for Lucene and 
> Solr (on master branch). See notes below on why this respin is needed.
> The code lives on *gradle-master* branch. It is kept with sync with *master*. 
> Try running the following to see an overview of helper guides concerning 
> typical workflow, testing and ant-migration helpers:
> gradlew :help
> A list of items that needs to be added or requires work. If you'd like to 
> work on any of these, please add your name to the list. Once you have a 
> patch/ pull request let me (dweiss) know - I'll try to coordinate the merges.
>  * Apply forbiddenAPIs  [dweiss working on this]
>  * Configure security policy/ sandboxing for tests.
>  * Add test 'beasting' (rerunning the same suite multiple times). I'm afraid 
> it'll be difficult to run it sensibly because gradle doesn't offer cwd 
> separation for the forked test runners.
>  * jar checksums, jar checksum computation and validation. This should be 
> done without intermediate folders (directly on dependency sets).
>  * add a :helpDeps explanation to how the dependency system works (palantir 
> plugin, lockfile) and how to retrieve structured information about current 
> dependencies of a given module (in a tree-like output).
>  * if you diff solr packaged distribution against ant-created distribution 
> there are minor differences in library versions and some JARs are excluded/ 
> moved around. I didn't try to force these as everything seems to work (tests, 
> etc.) – perhaps these differences should  be fixed in the ant build instead.
>  * identify and list precommit tasks so that they can be ported one by one. 
> (Mark's branch has some of this stuff already implemented)
>  * identify and port any other "check" utilities that may be called from ant. 
> (Mark's branch has some of this stuff already implemented)
>  * identify and port various "regenerate" tasks from ant builds (javacc, 
> precompiled automata, etc.)
>  * add rendering of javadocs (gradlew javadoc) and attaching them to maven 
> publications.
>  * fill in POM details in gradle/defaults-maven.gradle so that they reflect 
> the previous content better (dependencies aside).
>  * Add any IDE integration layers that should be added (I use IntelliJ and it 
> imports the project out of the box, without the need for any special tuning).
>  * *Clean up dependencies, especially for Solr*: any \{ transitive = false } 
> should just explicitly exclude whatever they don't need (and their 
> dependencies currently declared explicitly should be folded). Figure out 
> which scope to import a dependency to.
>  * Add Solr packaging for docs/* (see TODO in packaging/build.gradle; 
> currently XSLT...)
>  * I didn't bother adding Solr dist/test-framework to packaging (who'd use it 
> from a binary distribution? 
> *{color:#ff0000}Note:{color}* this builds on the work done by Mark Miller and 
> Cao Mạnh Đạt but also applies lessons learned from those two efforts:
>  * *Do not try to do too many things at once*. If we deviate too far from 
> master, the branch will be hard to merge.
>  * *Do everything in baby-steps* and add small, independent build fragments 
> replacing the old ant infrastructure.
>  * *Try to engage people to run, test and contribute early*. It can't be a 
> one-man effort. The more people understand and can contribute to the build, 
> the more healthy it will be.

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