In Java, what is the simplest way to create an SSLContext with just a PEM file?

I used LetsEncrypt's CertBot to generate PEM files for free. In other languages it is easy to start an HTTPS server using just a couple lines of code and the PEM/key files. The solutions I have found so far in java are overly complex and I'm looking for something simpler.

1. I do not want to use java's command-line "keytool". I just want to drag and drop my PEM/key files into my eclipse, and programatically start up an HTTPS server using an SSLContext.
2. I do not want to include massive external libraries like BouncyCastle. See the following link for a supposed solution using BouncyCastle: How to build a SSLSocketFactory from PEM certificate and key without converting to keystore?

Is there a better/easier way to do this?