The project was not built since its build path is incomplete eclipse java maven

For those encountering this error while using Maven:

    Right click on the project, Build Path -> Configure Build Path...
    Select the libraries tab. If Maven dependencies is not in the list, you have identified the problem.
    Close the dialog.
    Right click on the project, Maven -> Disable Maven Nature
    Right click on the project, Configure -> Convert to Maven Project.

Maven Unable to locate the Javac Compiler in:

It has 4 steps TODO.

Step 1 : Right Click on Eclipse project Properties

Step 2 : Java Build Path >Libraries

Step 3 : Click on JRE > Edit > Installed JRE

Step 4 : Edit Jre > Set JRE Home = JAVA_HOME