According to http://rehudson.us.oracle.com:8080/hudson/view/JDK8/view/Nightly/view/jigsaw/job/jigsaw-2-build-windows-i586-product/ws/jigsaw/build/windows-i586/moduleinfo/classlist/ the java.util.logging won't be in the core jdk.base module, but will have its own jdk.logging module. The javafx-ui-quantum and prism-common should use the javafx-logging classes for logging. These work even when java.util.logging is not present.

The classes which currently use the java.util.logging directly are:

com.sun.javafx.tk.quantum.GlassScene
com.sun.prism.camera.PrismPerspectiveCameraImpl