Unable to run simple program of maven from Eclipse

I have maven project just written Hello in it.

Process 1: If I goto Project in top bar >> than click on clean and right click on project name >> Run as >> Maven test ...it works and gives output

Process 2: If I right click on project name >> Run as >> Maven clean>> again right click on project name >> Run as >> Maven test......it fails and gives

[ERROR] No compiler is provided in this environment. Perhaps you are running on a JRE rather than a JDK?

Why process two is not working?

Note: I have added JDK in java>> Installed JREs>> Execution environment

Environment:Ubuntu with Java openjdk version "11.0.6" 2020-01-14