[jira] [Created] (ARROW-18020) [Java][CI] Apache Arrow Java Support Version Policy

["David Dali Susanibar Arce (Jira)" <ji...@apache.org>]

David Dali Susanibar Arce created ARROW-18020:
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             Summary: [Java][CI] Apache Arrow Java Support Version Policy
                 Key: ARROW-18020
                 URL: https://issues.apache.org/jira/browse/ARROW-18020
             Project: Apache Arrow
          Issue Type: Improvement
          Components: Documentation, Java
    Affects Versions: 11.0.0
            Reporter: David Dali Susanibar Arce


**Current status**

1. Apache Arrow Java is compiled and tested by JDK 8, 11, 17, 18 but packaged with source/target JDK8

**Changes implemented by this PR**

1. Apache Arrow Java project are continuing compiled and tested by JDK 8, 11, 17, 18 but packaged with source/target JDK8
2. If Apache Arrow Java project is building with JDK11+ validate the project are tested against the module-info.java definitions
3. There are not CI implementation to deliver Jar library with JDK8 & JDK11+ (we need to define what will be our next step for JDK versions)
4. We probably are breaking APIs because we are changing package name to ensure unique package names on the project required by module-info.java
5. We are added a new project that contains Apache Arrow Netty custom implementation needed for
6. There are remaining modules pending to implement modules with module-info.java files. This PR contains modules-info.java for: Format / Memory / Vector

**Next steps**

1. Implement cross-compilation with JDK 11+ and packaging with release=8 (continue offering support for JDK8):
That is not posible, if we compile with --release=8 we will have problems to access sun.misc.Unsafe that is not as exposed/public/documented API for N >= 9: -source N -target N --system <documented-APIs-from-N>.    (https://openjdk.org/jeps/247)
 
2. We have these options for our next steps:
- **Option 1**.- Maintain all as it is now, continue packaging with source/target JDK8

- **Option 2**.- Change/Update/Modify use of sun.misc.* classes dependencies to be able to support cross-compilation (--release 8) to packaging with JDK11+ and continue offering support for JDK8 also

````
jdeps --jdk-internals arrow-memory-unsafe-10.0.0-SNAPSHOT.jar
arrow-memory-unsafe-10.0.0-SNAPSHOT.jar -> jdk.unsupported
   org.apache.arrow.memory.unsafe.UnsafeAllocationManager -> sun.misc.Unsafe                                    JDK internal API (jdk.unsupported)

Warning: JDK internal APIs are unsupported and private to JDK implementation that are
subject to be removed or changed incompatibly and could break your application.
Please modify your code to eliminate dependence on any JDK internal APIs.
For the most recent update on JDK internal API replacements, please check:
https://wiki.openjdk.java.net/display/JDK8/Java+Dependency+Analysis+Tool

JDK Internal API                         Suggested Replacement
----------------                         ---------------------
sun.misc.Unsafe                          See http://openjdk.java.net/jeps/260

````

- **Option 3**.- _Drop support for JDK8_ and starting offering support to packaging with JDK11+, this will be the right approach, but, this thread does not have an agreement about to drop JDK8 support ([JAVA] JDK Support Policy - https://lists.apache.org/thread/phpgpydtt3yrgnncdyv4qdq1gf02s0yj)

If you decided to push some of this options please use that [ML](https://lists.apache.org/thread/phpgpydtt3yrgnncdyv4qdq1gf02s0yj) to move on next steps.



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