Java support

[jsteinich]

Closes #197

Adds:

• Core library output to Java
• Ability to generate modules/providers in Java
• Java app template with maven
• Basic documentation
• Simple examples
• Setup for release

Setting up the maven keys and profile is probably best left to the internal team.

[jsteinich]

There might be some instability in running the examples integration task. I'm not sure if https://github.com/hashicorp/terraform-cdk/pull/360/checks?check_run_id=1096559302 was a one off, or if we need to bootstrap the maven repo or have each example use its own cache.

[jsteinich]

There might be some instability in running the examples integration task

Looks like that is the case. I'll have to think about this some more. Once https://issues.apache.org/jira/browse/MRESOLVER-131 is finished, this could get easier.

[jsteinich]

I decided to just not run the java examples in parallel for now.
Looks like jsii did make a change recently to isolate local maven repos, so we could actually modify the examples to run isolated, though it would complicate the run command over what a user is likely to use.
(mvn -e -q --settings user.xml compile exec:java vs mvn -e -q compile exec:java)

[skorfmann]

Besides from Maven credentials for the Github action, is there anything else missing to get this merged @jsteinich ?

[jsteinich]

Besides from Maven credentials for the Github action, is there anything else missing to get this merged @jsteinich ?

I think that's all we need.

[skorfmann]

Besides from Maven credentials for the Github action, is there anything else missing to get this merged @jsteinich ?

I think that's all we need.

@anubhavmishra could you create these credentials and add them as secrets for actions?

[anubhavmishra]

I started working on getting an account to publish to Maven Central. It requires a bunch of changes to allow Sonatype to verify our account. It does require work so I will get back to you on this one.

https://github.com/aws/jsii-release#maven

[skorfmann]

We'll look into github package registry as a temporary way to publish the packages

[jsteinich]

We'll look into github package registry as a temporary way to publish the packages

Just looked into it some. Seems like they still don't support anonymous package download which will make it quite annoying to use.

Would publishing the artifacts not under hashicorp make the maven central setup easier? Or you using jcenter or some other repo?

[skorfmann]

Just looked into it some. Seems like they still don't support anonymous package download which will make it quite annoying to use.

Oh, yeah - that's bad https://docs.github.com/en/free-pro-team@latest/packages/publishing-and-managing-packages/installing-a-package

Would publishing the artifacts not under hashicorp make the maven central setup easier?

What options do you see there?

[jsteinich]

Would publishing the artifacts not under hashicorp make the maven central setup easier?

What options do you see there?

I haven't personally published to maven central, but the instructions seem pretty simple so I'm wondering if existing hashicorp accounts are complicating things. Maybe something like org.cdktf or org.terraformcdk that is managed outside hashicorp.

[jsteinich]

I updated the release workflow to publish to GitHub packages rather than maven central and left a note about it in the Java getting started guide.
I'm also going to try working on getting the functionality into jsii-release to make is easier for the pre-built providers (though it seems possible to do in projen without that).

[skorfmann]

Awesome stuff! Thank you so much for contributing this 🚀

[github-actions]

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