How to make an Android application alert when an entry is added to the server database?

Question

PostgreSQL

I have a Spring server with a PostgreSQL database running Hibernate. There is a client application on Android, from which POST and GET requests are sent to the server.
The application is essentially a messenger. There was such a problem: how to notify one user about adding a message record to the database from another without regular GET requests to the server?

Answer 1

Use Firebase Cloud Messaging .