The full list of resolved issues in 1.9.4 is available here.
AspectJ 1.9.4 has a couple of important fixes in it:
It is harmless (at the moment) but if you want to remove it you can run your JDK with --add-opens java.base/java.lang=ALL-UNNAMED.
WARNING: An illegal reflective access operation has occurred WARNING: Illegal reflective access using Lookup on org.aspectj.weaver.loadtime.ClassLoaderWeavingAdaptor (file: aspectjweaver-1.9.2.jar) to class java.lang.ClassLoader WARNING: Please consider reporting this to the maintainers of org.aspectj.weaver.loadtime.ClassLoaderWeavingAdaptor 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
Available: 1.9.4 available 10-May-2019