fix #51 Gradle 7 incompatibility and fix #56 Gradle 8 incompatibility

[seanrl]

This adds the appropriate @internal annotations to resolve the Gradle 7+ incompatibility bugs described in Issue #51.

[repose-bot]

Can one of the admins verify this patch?

[seanrl]

Would be great if we can knock this out quickly. I know its been awhile since a new version was necessary, and this is a fairly stable repository - but the plugin is currently unusable with Gradle 7+.

[benjaminkomen]

I came here because https://github.com/jacobono/gradle-jaxb-plugin didn't work after upgrade to gradle 7.2 anymore. But this fork doesn't work either unless this PR is merged. Any idea when this can be done?

[NilsDammenhayn]

There is another fork that works with gradle 7... com.github.seanrl.jaxb in version 2.5.1
Gradle Plugin Page
Github Page

[liuqu11]

How to solve？

[chkpnt]

I can confirm @seanrl's fork works well with Gradle 7.3.3.

[scottrobey]

Is there an admin for this project that could merge this PR? @dmnjohns @wdschei ?

[adrianjgeorge]

I was formerly an admin, i Can tell you that everyone that use to support this are no longer at the company, and have had our permissions removed. I'll reach out to some people i know who are still there and see if they can get it moving.