src/jdk.jdeps/share/classes/com/sun/tools/jdeps/PlatformClassPath.java

*** 95,121 ****
                  .map(Archive::getInstance)
                  .collect(Collectors.toList());
      }
  
      static class ImageHelper {
          static ImageHelper getInstance(Path mpath) throws IOException {
              if (mpath != null) {
                  return new ImageHelper(mpath);
              }
!             Path home = Paths.get(System.getProperty("java.home"));
!             Path mlib = home.resolve("lib").resolve("modules");
!             if (Files.isDirectory(mlib)) {
!                 // jimage
                  FileSystem fs = FileSystems.getFileSystem(URI.create("jrt:/"));
!                 return new ImageHelper(fs, fs.getPath("/"));
              } else {
                  // exploded modules
!                 mlib = home.resolve("modules");
!                 if (!Files.isDirectory(mlib)) {
                      throw new InternalError(home + " not a modular image");
                  }
!                 return new ImageHelper(mlib);
              }
          }
  
          private final FileSystem fs;
          private final Path mpath;
--- 95,130 ----
                  .map(Archive::getInstance)
                  .collect(Collectors.toList());
      }
  
      static class ImageHelper {
+         private static boolean isJrtAvailable() {
+             try {
+                 FileSystems.getFileSystem(URI.create("jrt:/"));
+                 return true;
+             } catch (ProviderNotFoundException | FileSystemNotFoundException e) {
+                 return false;
+             }
+         }
+ 
          static ImageHelper getInstance(Path mpath) throws IOException {
              if (mpath != null) {
                  return new ImageHelper(mpath);
              }
! 
!             if (isJrtAvailable()) {
!                 // jrt file system
                  FileSystem fs = FileSystems.getFileSystem(URI.create("jrt:/"));
!                 return new ImageHelper(fs, fs.getPath("/modules"));
              } else {
                  // exploded modules
!                 String home = System.getProperty("java.home");
!                 Path exploded = Paths.get(home, "modules");
!                 if (!Files.isDirectory(exploded)) {
                       throw new InternalError(home + " not a modular image");
                  }
!                 return new ImageHelper(exploded);
              }
          }
  
          private final FileSystem fs;
          private final Path mpath;