AppCDS, DynamicCDS, Leyden and JRuby

[Charles Oliver Nutter]

On Wed, Feb 12, 2025 at 4:22 PM Charles Oliver Nutter <headius at headius.com>
wrote:

> Have you tried the -XX:+AutoCreateSharedArchive flag? It should recreate
>> the dynamic archive if you have updated the app's JAR files or updated to a
>> new JDK.
>>
> This is definitely what we want for the JRuby launcher! I've integrated it
> into the launcher and it seems to work well (my log redirects must still be
> included to silence CDS warnings, though):
>

I am seeing two peculiar warnings in the log file while using this flag:

[0.001s][info][cds] optimized module handling: disabled due to incompatible
property: jdk.module.path=/Users/headius/work/jruby/lib/jruby.jar

This is not a property I'm setting. The full command line for this JRuby
execution is here:

/Library/Java/JavaVirtualMachines/zulu-21.jdk/Contents/Home/bin/java
@/Users/headius/work/jruby/bin/.jruby.java_opts
@/Users/headius/work/jruby/bin/.jruby.module_opts -Xss2048k
-XX:+AutoCreateSharedArchive
-XX:SharedArchiveFile=/Users/headius/work/jruby/lib/jruby.jsa -Xlog:cds=off
-Xlog:cds+dynamic=off
-Djffi.boot.library.path=/Users/headius/work/jruby/lib/jni
-Djava.security.egd=file:/dev/urandom --module-path
/Users/headius/work/jruby/lib/jruby.jar -classpath :
-Djruby.home=/Users/headius/work/jruby
-Djruby.lib=/Users/headius/work/jruby/lib -Djruby.script=jruby
-Djruby.shell=/bin/sh org.jruby.Main -e 1

The java_opts file is empty and the module_opts file just has some
add-opens we need.

[0.001s][warning][cds] AutoCreateSharedArchive is ignored because
/Users/headius/work/jruby/lib/jruby.jsa is a static archive

I have no idea what this means. Once I get in this state it complains every
startup and will also refuse to overwrite the "bad" jsa file. I had thought
that it would overwrite the file if it could not use it, so I don't have to
manually separate CDS archives from different JDKs... did I misunderstand?
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