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:
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
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.
Available: 1.9.4 available 10-May-2019