IONIC COMPILE ANDROID

Command: ionic cordova build android --prod

Failed to run "javac -version":
http://www.oracle.com/technetwork/java/javase/downloads.

1-[https://stackoverflow.com/questions/49507160/how-to-install-jdk-10-under-ubuntu]
sudo add-apt-repository ppa:linuxuprising/java
sudo apt-get update
sudo apt-get install oracle-java10-installer
sudo apt-get install oracle-java10-set-default

Failed to find 'JAVA_HOME' environment variable.
2-

continue...