ADDITIONAL SYSTEM INFORMATION :
osx jdk25


A DESCRIPTION OF THE PROBLEM :
packaged with jpackage, signed with codesign, entitlements definitely includes "sandbox"

Validation failed (409)
App sandbox not enabled. The following executables must include the "com.apple.security.app-sandbox" entitlement with a Boolean value of true in the entitlements property list: [( "com.yyyyy.app.launcher.pkg/Payload/yyyyy.app/Contents/runtime/Contents/Home/lib/jspawnhelper" )] Refer to App Sandbox page at https://developer.apple.com/documentation/security/app_sandbox for more information on sandboxing your app. (ID: ..............)

The mention of jspawnhelper makes me suspect that java apps are fundamentally unaccceptable
to the mac app store. I hope to be shown to be wrong.

STEPS TO FOLLOW TO REPRODUCE THE PROBLEM :
package a mac app with a command such as

jpackager -i xxxxx --mac-app-category games --mac-app-store --mac-entitlements xxxxx.entitlements --main-jar xxxxx.jar -t "app-image" --app-version $1 --copyright "DEV_NAME" --description "desktop launcher for xxxxx.net" --icon xxxxx.icns --name "xxxxx" --mac-package-name "XXXXX.net" --mac-package-identifier "com.xxxxx.launcher"

EXPECTED VERSUS ACTUAL BEHAVIOR :
EXPECTED -
an acceptable app

ACTUAL -
see above
the app can be installed locally and runs fine. mac store won't accept it.