Spawn java process from sandboxed macOS app

Hi there! I am trying to publish a macOS app on App Store, thus the app must be sandboxed. The app is built with Electron and electron-builder. A tool of the app needs to run a local web server, to do so a java runtime and a .jar file are downloaded during runtime and the server is started using spawn. In the MAS version of the app, running from TestFlight, I get EPERM error when spawn is called. Both java's runtime and .jar are downloaded to app's container. I have tried also downloading them to outside the container (by saving them in the directories that are symlinked to outside of it) by I get the same error. How could I solve that issue?