RFR: 8364352: Some tests fail when using a limited number of pregenerated .jsa CDS archives

[David Holmes]

On Mon, 18 Aug 2025 11:34:28 GMT, Matthias Baesken <mbaesken at openjdk.org> wrote:

> Currently the default JVM comes on most platforms with 4 jsa files (for coops and nocoops; with and without compressed object headers), but for some shipments the number of jsa could be reduced (see also Images.gmk) .
> But not all tests can deal with this.
> Namely
> 
> test/hotspot/jtreg/runtime/CompressedOops/CompressedCPUSpecificClassSpaceReservation.java
> test/hotspot/jtreg/runtime/cds/TestDefaultArchiveLoading.java
> test/hotspot/jtreg/runtime/cds/appcds/loaderConstraints/DynamicLoaderConstraintsTest.java (custom-cl-zgc)
> 
> were found to have issues.
> There is already a requires  `vm.cds.default.archive.available`   that is used in similar tests and can be used in some of those cases too.

test/hotspot/jtreg/runtime/cds/appcds/loaderConstraints/DynamicLoaderConstraintsTest.java line 58:

> 56:  * @test id=custom-cl-zgc
> 57:  * @requires vm.cds.custom.loaders
> 58:  * @requires vm.cds.default.archive.available

Don't understand this one. This test is hard to follow but I think it does its own dumping of the CDS archive, so I don't see why it would need the default archive to exist. ???

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PR Review Comment: https://git.openjdk.org/jdk/pull/26820#discussion_r2289274145