GH-36604: [Java][CI] Set up Arrow Java support for JDK8 and JDK11+ maven packaging

[davisusanibar]

Rationale for this change

To close #36604

What changes are included in this PR?

Set up Arrow Java support for JDK8 and JDK11+

Are these changes tested?

Yes, it is testing by github actions java jars

Are there any user-facing changes?

Yes

• Closes: [Java][CI] Set up Arrow Java support for JDK8 and JDK11+ #36604

[github-actions]

⚠️ GitHub issue #36604 has been automatically assigned in GitHub to PR creator.

[davisusanibar]

@github-actions crossbow submit java-jars

[github-actions]

Revision: 0542482

Submitted crossbow builds: ursacomputing/crossbow @ actions-20eaf46aae

Task	Status
java-jars

[davisusanibar]

@github-actions crossbow submit java-jars

[github-actions]

Revision: bc48907

Submitted crossbow builds: ursacomputing/crossbow @ actions-7e578d1b36

Task	Status
java-jars

[lidavidm]

I thought the point is that we wouldn't support Java 8 after some date? Why are we building separate JARs for Java 8 when there's no point anyways? (We can't use any new language features, so we might as well stick with the current toolchain, if we are going to support Java 8.)

[davisusanibar]

I thought the point is that we wouldn't support Java 8 after some date? Why are we building separate JARs for Java 8 when there's no point anyways? (We can't use any new language features, so we might as well stick with the current toolchain, if we are going to support Java 8.)

Hi @lidavidm, this draft PR shows how we can build Arrow Java using JDK8 & JDK11 and offer both versions independently. We will need to mark one version arrow in the future that will be the last to support JDK8, so we propose to tag them (ie: classifier jdk8).

Alternatively, we could defer this discussion until we have an agreement to deprecate JDK8 and only support JDK11.

Let me maintain this PR as a draft to I could continue when we have an agreement as a community to deprecate JDK8.

[lidavidm]

What is the point of building a separate JDK11 version from the same source code? We can't use Java 11 features anyways, so we may as well continue targeting Java 8.

[davisusanibar]

What is the point of building a separate JDK11 version from the same source code? We can't use Java 11 features anyways, so we may as well continue targeting Java 8.

The significance of this only applies if we deprecate JDK8, in which case source/target should start with Java 11.

[lidavidm]

You can't target Java 8 when using Java 9+ features, so this is still pointless.