Even though JRE 8 is installed on my MAC -" No Java Runtime present,requesting to install " gets displayed in terminal

You have to install the full JDK, not only the JRE.

I had the same issue and solved by installing JDK.

Please use this link to download the latest JDK version 15.0.2.

I didn't need the full JDK, I just needed to make JRE work and none of the other answers provided above worked for me. Maybe it used to work, but now (1st Jul 2018) it isn't working. I just kept getting the error and the pop-up.

I eventually solved this issue by placing the following JAVA_HOME export in ~/.bash_profile:

export JAVA_HOME=/Library/Internet\ Plug-Ins/JavaAppletPlugin.plugin/Contents/Home

Hope this helps someone. I'm running Mac OS High Sierra.

Since it sounds like your JAVA_HOME variable is not set correctly, follow the instructions for setting that.

Setting JAVA_HOME environment variable on MAC OSX 10.9

I would imagine once you set this, it will stop complaining.