Resolve startup warning "An illegal reflective access operation has occurred"

[ljdelight]

This warning is printed during startup:

WARNING: An illegal reflective access operation has occurred
WARNING: Illegal reflective access by com.google.inject.internal.cglib.core.$ReflectUtils$1 (file:/home/ljdelight/.cache/coursier/v1/https/repo1.maven.org/maven2/com/google/inject/guice/4.2.3/guice-4.2.3.jar) to method java.lang.ClassLoader.defineClass(java.lang.String,byte[],int,int,java.security.ProtectionDomain)
WARNING: Please consider reporting this to the maintainers of com.google.inject.internal.cglib.core.$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

It's not a problem with Java 11 but it could block upgrading to JDK17 or JDK21. Easy attempt at a solution is upgrading guice (from guice-4.2.3.jar to later), but this needs caution to not break Playframework