Test langtools/tools/javac/diags/CheckResourceKeys.java is failing after:
http://hg.openjdk.java.net/jdk9/dev/langtools/rev/f839b50088bc

This is because after the changeset, JavacFileManager reads a new System property ("show.fm.open.close"), and CheckResourcesKeys expects that all Strings in the built javac either have an entry in the resource bundle or are explicitly excluded, and neither is true for this new System property. A possible fix would be to include the property name in the list of excluded strings in the test.