--- old/modules/jdk.packager/src/main/java/jdk/packager/internal/legacy/Module.java	2017-12-20 20:42:47.000000000 -0800
+++ new/modules/jdk.packager/src/main/java/jdk/packager/internal/legacy/Module.java	2017-12-20 20:42:46.000000000 -0800
@@ -51,7 +51,9 @@
 
     public String getModuleName() {
         File file = new File(getFileName());
-        return getFileWithoutExtension(file.getName());
+        // do not try to remove extension for directories
+        return moduleType == ModuleType.ExplodedModule ?
+                file.getName() : getFileWithoutExtension(file.getName());
     }
 
     public String getFileName() {