jdk/src/jdk.jartool/share/classes/module-info.java

@@ -24,7 +24,9 @@
  */
 
 module jdk.jartool {
     exports com.sun.jarsigner;
     exports jdk.security.jarsigner;
+
+    provides java.util.spi.ToolProvider with sun.tools.jar.JarToolProvider;
 }