modules/fxpackager/src/main/java/com/oracle/tools/packager/JDepHelper.java

@@ -66,15 +66,16 @@
         try (ByteArrayOutputStream baos = new ByteArrayOutputStream();
              PrintWriter writer = new PrintWriter(baos)) {
 
             List<String> arguments = new ArrayList<>();
             arguments.add("-s");
-            //TODO JDK-8148654 - add support for -modulepath.
-            //if (modulePath != null || !modulePath.empty()) {
-            //    arguments.add("-modulepath");
-            //    ...
-            //}
+
+            if (modulePath != null || !modulePath.isEmpty()) {
+                arguments.add("-modulepath");
+                arguments.add(ListOfPathToString(modulePath));
+            }
+
             arguments.addAll(Files);
 
             invokeJdep(arguments.toArray(new String[arguments.size()]), writer);
 
             // output format is multiple lines of "this.jar -> that.module.name"

@@ -86,6 +87,21 @@
         } catch (IOException ioe) {
             Log.verbose(ioe);
             return new LinkedHashSet();
         }
     }
+
+    private static String ListOfPathToString(List<Path> Value) {
+        String result = "";
+
+        for (Path path : Value) {
+            if (result.isEmpty()) {
+                result = path.toString();
+            }
+            else {
+                result = File.pathSeparator + path.toString();
+            }
+        }
+
+        return result;
+    }
 }