In JDK 9+, add the following option to the JVM to disable the warning from Spring’s use of CGLIB:
--add-opens java.base/java.lang=ALL-UNNAMED
for example:
java --add-opens java.base/java.lang=ALL-UNNAMED -jar target/*.jar
No need to report it; it’s a known Spring bug.
This happens because the new JDK 9 module system detected an illegal access that will be disallowed sometime in the (near) future. You can read more about the JDK 9 Module system here.
Update:
A fix for this issue is available JDK 9+ with Spring 5.1+.