test/testlibrary/ClassFileInstaller.java

@@ -43,11 +43,13 @@
             String pathName = arg.replace('.', '/').concat(".class");
             InputStream is = cl.getResourceAsStream(pathName);
 
             // Create the class file's package directory
             Path p = Paths.get(pathName);
+            if (pathName.contains("/")) {
             Files.createDirectories(p.getParent());
+            }
             // Create the class file
             Files.copy(is, p, StandardCopyOption.REPLACE_EXISTING);
         }
     }
 }