Build does not work with JDK16 as gradle's runtime [LUCENE-10066]

[asfimport]

This is because of spotless trying to access internal APIs - can be worked around by opening them [1].

There is also an odd warning/ error about a deprecated constructor (singleton new Long(0)). I didn't look at it.

[1] diffplug/spotless#834 (comment)

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Migrated from LUCENE-10066 by Dawid Weiss (@dweiss), resolved Aug 26 2021
Linked issues:

• Tracking issue for Gradle upgrade to 7.2 [LUCENE-9990] #11029

[asfimport]

Dawid Weiss (@dweiss) (migrated from JIRA)

Created a PR that upgrades spotless and adds a few defaults to the auto-generated gradle.properties (you'll have to wipe your local copy to work with JDK16 or add these changes manually).

[asfimport]

ASF subversion and git services (migrated from JIRA)

Commit 39a2fc6 in lucene's branch refs/heads/main from Dawid Weiss
https://gitbox.apache.org/repos/asf?p=lucene.git;h=39a2fc6

LUCENE-10066: Build does not work with JDK16 as gradle's runtime (#259)

[asfimport]

Adrien Grand (@jpountz) (migrated from JIRA)

Closing after the 9.0.0 release