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I am trying to deploy my Spring Boot Web application to HEROKU and I am getting the following error:

***> -----> Building on the Heroku-20 stack

-----> Determining which buildpack to use for this app ! No default language could be detected for this app. HINT: This occurs when Heroku cannot detect the buildpack to use for this application automatically. See https://devcenter.heroku.com/articles/buildpacks ! Push failed***

I tried setting the build back to heroku/java manually only to also get an error. The app is built in java so I don't understand what is happening exactly. This is my first time deploying an app online. Any help or guidance will be greatly appriciated