SunFontManager.java invokes ConcurrentHashMap.contains(Object), which is denigrated.
If you change that method to be @Deprecated, the build fails with

jdk/src/java.desktop/share/classes/sun/font/SunFontManager.java:1847: warning: [deprecation] contains(Object) in ConcurrentHashMap has been deprecated
            !registeredFonts.contains(file)) {

contains is equivalent to containsValue and that would be a good change to make, except that it looks like the intent was to check for a key, i.e. the author intended a call to containsKey(Object) and fell into the contains trap.