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

*** 219,229 ****
                  out.println(arg);
              }
              Path modsDir = getAppModsDir();
              if (modsDir != null && modsDir.toFile().exists()) {
                  out.println("--module-path");
!                 out.println(getAppDir().relativize(modsDir));
              }
  
              out.println();
              out.println("[ArgOptions]");
              List<String> args = ARGUMENTS.fetchFrom(params);
--- 219,229 ----
                  out.println(arg);
              }
              Path modsDir = getAppModsDir();
              if (modsDir != null && modsDir.toFile().exists()) {
                  out.println("--module-path");
!                 out.println("$APPDIR/app/" + getAppDir().relativize(modsDir));
              }
  
              out.println();
              out.println("[ArgOptions]");
              List<String> args = ARGUMENTS.fetchFrom(params);