Warning: An illegal reflective access operation has occurred reported during startup

[vladovav]

We are running Apache Cassandra 4.0.10 using Java 11.0.19.7.1, Cassandra exporter (both 0.9.12 and 0.9.13 versions) reports the following warning during every startup:

~$ WARNING: An illegal reflective access operation has occurred
WARNING: Illegal reflective access by io.netty.util.internal.ReflectionUtil (file:/opt/cassandra-exporter/cassandra-exporter-standalone-0.9.13.jar) to constructor java.nio.DirectByteBuffer(long,int)
WARNING: Please consider reporting this to the maintainers of io.netty.util.internal.ReflectionUtil
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