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The only issue I’ve found so far is that the looping task producers emit an error to STDERR on every run. I have set up cron jobs to run the loopers daily and send us an email if there are errors, so now we’re receiving this error for every looper every day.

WARNING: An illegal reflective access operation has occurred
WARNING: Illegal reflective access by org.springframework.cglib.core.ReflectUtils$1 (file:/var/lib/duracloud/auditlog-generator.jar) to method java.lang.ClassLoader.defineClass(java.lang.String,byte[],int,int,java.security.ProtectionDomain)
WARNING: Please consider reporting this to the maintainers of org.springframework.cglib.core.ReflectUtils$1
WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations
WARNING: All illegal access operations will be denied in a future release

This is a known issue with Spring and Java 9+. https://github.com/spring-projects/spring-framework/issues/20414

It looks like this is addressed in more recent version of the Spring framework.

The workaround is to add these parameters to the JVM.

--add-opens java.base/java.lang=ALL-UNNAMED --add-opens java.base/java.lang.invoke=ALL-UNNAMED