Memory-Access Methods in sun.misc.Unsafe are deprecated for removal

[cushon]

Describe the bug, including details regarding any error messages, version, and platform.

In JDK 24, JEP 498: Warn upon Use of Memory-Access Methods in sun.misc.Unsafe deprecates several memory access methods in sun.misc.Unsafe for removal.

These methods are used by arrow here https://github.com/laurentgo/arrow/blob/fa8ebdebd1109217a6ac1ae2f173e1ab9d400d82/java/memory/memory-core/src/main/java/org/apache/arrow/memory/util/MemoryUtil.java#L30

apache/arrow#43479 is related, it refactored uses of these APIs to consolidate the references in MemoryUtil, and mentions that change is

a first step towards switching from sun.misc.Unsafe to safer memory access methods (which may become a requirement at some point as discussed in JEP 471 )

Are there plans to switch to safer memory access methods?

Component(s)

Java

[vibhatha]

@cushon Yes, we have discussed this in the past and there have been several efforts started to do this migration. But this may require some incremental improvements.

Please refer to the discussions and older PRs focused on this direction.

1. [Java] Implement arrow-memory-ffm #163
2. GH-37739: [Java] Add experimental arrow-memory-ffm module arrow#38016
3. WIP: [Java] Require Java 22 to build Arrow arrow#43050

[jbonofre]

I'm resuming our work on this one.
I think it's an important one as it "blocks" the update to Java 22/23.