ZIP64 support

[tajila]

Issue or pull request number:
eclipse-openj9/openj9#23458
eclipse-openj9/openj9#23462
eclipse-openj9/openj9#23464
eclipse-openj9/openj9#23454
eclipse-openj9/openj9#23417

Overview:
Add ZIP64 support

Release target:
0.60

Applies to the following JDK versions:
8+

Applies to the following platforms:
All platforms

[tajila]

FYI @pshipton

[tajila]

@hangshao0 was there an initial issue open for this work?

[hangshao0]

was there an initial issue open for this work?

There was an internal issue that this work originates from. But the internal issue is about enhancing ZIP64 in both VM and JCL. VM does not support ZIP64, so we need to add ZIP64 support in VM.

[Sreekala-Gopakumar]

@tajila @hangshao0 - What is the purpose of ZIP64 support? What were the issues that happened because of lack of this support?

Was there any size limitations when loading bootstrap classes from large JAR files?

Connected to this, I found zip files mentioned in https://eclipse.dev/openj9/docs/xzero/ but it is also mentioned that this option is deprecated and will be removed in a future release. I wanted to know whether this option is still applicable and confirm that it has not been removed as yet.

If it is still applicable then should I be mentioning the support for ZIP64 in this topic as well? Thanks!

[hangshao0]

What is the purpose of ZIP64 support? What were the issues that happened because of lack of this support?
Was there any size limitations when loading bootstrap classes from large JAR files?

Yes, there is a limitation of loading bootstrap classes in large JARs without ZIP64 support. The Jar/zip file on the class path cannot be greater than 4GB in size. However, JVM class loading should not be limited by the 4GB size.

I wanted to know whether this option is still applicable and confirm that it has not been removed as yet.

They are still applicable and not removed.

If it is still applicable then should I be mentioning the support for ZIP64 in this topic as well?

Could you confirm this ? @lzhou2025

[lzhou2025]

Yes, it's still applicable and supported for ZIP64.

[pshipton]

I see eclipse-openj9/openj9#23594 is not yet merged, I assume this should wait on that.