Which library we need to use to send VOIP notification call to IOS using APNS using spring-boot JAVA framework?

Hi Guys,

I am using spring-boot framework and I have the requirement to send VOIP notification call to IOS. I found few JAVA libraries which will help us to achieve it but the libraries seems like outdated. Please find the below git-hub link for reference,

https://github.com/notnoop/java-apns

https://github.com/mlaccetti/JavaPNS

I need a suggestion from Apple development forum which library shall we use or we can directly hit the Apple push notification server API? What is the best practices?

Appreciate your help and guidelines.