RFR: 8287873: Add test for using -XX:+AutoCreateSharedArchive with different JDK versions

[Coleen Phillimore]

On Wed, 4 Jan 2023 20:07:48 GMT, Matias Saavedra Silva <matsaave at openjdk.org> wrote:

> This is an enhancement of the test case in [JDK-8296754](https://bugs.openjdk.org/browse/JDK-8296754), which tests against an archive created by the "boot JDK", which is usually set as the previous official JDK release when building the JDK repo.
> 
> If it's able to acquire previous valid JDK releases:
>      - Download and install previous JDK versions (19 through N)
>         where N == java.lang.Runtime.version​().major() - 1
>      - Test the interaction of the current JDK versus each of the previous releases
> 
> If it's not able to find the previous releases revert to the existing logic in TestAutoCreateSharedArchiveUpgrade.java (use the test.boot.jdk or test.previous.jdk properties). Verified with tier1-4 tests.

I can't really review this since I don't know this code but it seems like something that will timeout in the future if it's trying to download JDKs for this test.

bin/jib.sh line 197:

> 195: export REAL_CONFIGURE_COMMAND_EXEC_SHORT="$myname"
> 196: 
> 197: ${installed_jib_script} "$@"

Don't we need this?

test/hotspot/jtreg/runtime/cds/appcds/dynamicArchive/TestAutoCreateSharedArchiveUpgrade.java line 80:

> 78: 
> 79:         // Earliest testable version is 19
> 80:         int n = java.lang.Runtime.version().major() - 1;

Can this just do n-1 and not download every release? So if JDK 20 works with JDK 19, then JDK 21 works with JDK 20 and transitively would work with 19?

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PR: https://git.openjdk.org/jdk/pull/11852