How to turn off project facets on eclipse?

• Go to your /workspace/project/
• Edit .project file
• Make a backup of this file as a precaution

Search <nature> tag and remove all references, except this one:

<nature>org.eclipse.m2e.core.maven2Nature</nature>

The above line says you are using a maven project.

Remove other lines like:

<nature>org.eclipse.jdt.core.javanature</nature>
<nature>org.eclipse.wst.common.project.facet.core.nature</nature>