--- a/langtools/make/tools/crules/MutableFieldsAnalyzer.java	Tue Oct 04 18:43:36 2016 -0700
+++ b/langtools/make/tools/crules/MutableFieldsAnalyzer.java	Tue Oct 04 18:56:03 2016 -0700
@@ -111,6 +111,8 @@
                 "loadMethod");
         ignoreFields("com.sun.tools.javac.util.JDK9Wrappers$VMHelper",
                 "vmClass", "getRuntimeArgumentsMethod");
+        ignoreFields("com.sun.tools.javac.util.JDK9Wrappers$JmodFile",
+                "jmodFileClass", "checkMagicMethod");
     }
 
 }