As of JDK 9 build 95, the new version scheme breaks AspectJ's JVM detection which affects many tests in the Spring codebase. Andy's AspectJ 1.9 beta 3 fixes this.
A few core framework tests need to be revised towards lenient handling of the Java version string as well. The framework itself has been prepared for that step already but not all tests yet. This ticket therefore covers everything needed to make the core framework build pass on JDK 9 build 95 and higher (latest at the time of writing: build 99).