src/jdk.jpackage/share/classes/jdk/jpackage/internal/AbstractImageBundler.java

*** 57,77 ****
  
      public void imageBundleValidation(Map<String, ? super Object> p)
               throws ConfigException {
          StandardBundlerParam.validateMainClassInfoFromAppResources(p);
  
-         boolean hasMainJar = MAIN_JAR.fetchFrom(p) != null;
-         boolean hasMainModule =
-                 StandardBundlerParam.MODULE.fetchFrom(p) != null;
-         boolean hasMainClass = MAIN_CLASS.fetchFrom(p) != null;
-         boolean runtime = RUNTIME_INSTALLER.fetchFrom(p);
- 
-         if (!hasMainJar && !hasMainModule && !hasMainClass && !runtime) {
-             throw new ConfigException(
-                     I18N.getString("error.no-application-class"),
-                     I18N.getString("error.no-application-class.advice"));
-         }
      }
  
      public static void extractFlagsFromVersion(
              Map<String, ? super Object> params, String versionOutput) {
          Pattern bitArchPattern = Pattern.compile("(\\d*)[- ]?[bB]it");
--- 57,66 ----
*** 119,130 ****
              }
          }
      }
  
      protected File createRoot(Map<String, ? super Object> p,
!             File outputDirectory, boolean dependentTask,
!             String name, String jlinkKey) throws PackagerException {
          if (!outputDirectory.isDirectory() && !outputDirectory.mkdirs()) {
              throw new RuntimeException(MessageFormat.format(
                      I18N.getString("error.cannot-create-output-dir"),
                      outputDirectory.getAbsolutePath()));
          }
--- 108,119 ----
              }
          }
      }
  
      protected File createRoot(Map<String, ? super Object> p,
!             File outputDirectory, boolean dependentTask, String name)
!             throws PackagerException {
          if (!outputDirectory.isDirectory() && !outputDirectory.mkdirs()) {
              throw new RuntimeException(MessageFormat.format(
                      I18N.getString("error.cannot-create-output-dir"),
                      outputDirectory.getAbsolutePath()));
          }
*** 141,160 ****
  
          // Create directory structure
          File rootDirectory = new File(outputDirectory, name);
  
          if (rootDirectory.exists()) {
!             if (!(OVERWRITE.fetchFrom(p))) {
!                 throw new PackagerException("error.root-exists-without-overwrite",
                          rootDirectory.getAbsolutePath());
              }
!             try {
!                 IOUtils.deleteRecursive(rootDirectory);
!             } catch (IOException ioe) {
!                 throw new PackagerException(ioe);
!             }
!         }
          rootDirectory.mkdirs();
  
          return rootDirectory;
      }
  
--- 130,143 ----
  
          // Create directory structure
          File rootDirectory = new File(outputDirectory, name);
  
          if (rootDirectory.exists()) {
!             throw new PackagerException("error.root-exists",
                      rootDirectory.getAbsolutePath());
          }
! 
          rootDirectory.mkdirs();
  
          return rootDirectory;
      }