The fix in https://bz.apache.org/bugzilla/show_bug.cgi?id=60087#c3 has introduced a new issue resolving resources url. I've made a project to test this behaviour https://github.com/didiez/tomcat-bug-60087 Run the main-app to see the problem. If built changing tomcat.version to 8.5.5 everything works as expected.
This has already been fixed in: - trunk for 9.0.0.M14 onwards - 8.5.x for 8.5.9 onwards See https://github.com/spring-projects/spring-boot/issues/7360 for further info.
Is this going to be fixed in 8.0.x?
It has already been fixed in 8.0.x for 8.0.40 onwards (release currently in progress)