Configuring a Headless RPi

• Install the OS Using the Raspberry Pi Imager.
• Mount the SD card again in the Windows environment
• To enable SSH, create an empty file named 'ssh' in the root of the SD card
• To configure WiFi, create the wpa_supplicant.conf file in the root of the SD card

  ctrl_interface=DIR=/var/run/wpa_supplicant GROUP=netdev
  update_config=1
  country=GB
  
  network={
          ssid="ssid"
          psk="psk"
  }
  

• Boot the RPi with the card and run raspi-config to set hostname, interfaces etc.
• Install Java with:

  sudo apt install default-jdk
    
  # or for older RPi mmodels
  sudo apt install openjdk-8-jdk liblog4j2-java wiringpi libmysql-java
  

Edit: turns out these can now be set up with the Raspberry Pi Imager v1.6, which is a lot easier...