Faceted Project Eclipse environment

Even if I have checked this post and try the solution 开发者_运维知识库on it, the problem is still there.

Java compiler level does not match the version of the installed Java project facet. Project-name Unknown Faceted Project Problem (Java Version Mismatch)

Eclipse gives up a solution.
Just click right mouse over the problem, in the Problems view, Choose "Quick Fix", and run with another version which I was running before.

Go to project properties, check the Project Facets section, set the correct JRE

on properties of the project and go to project facets, at this point you must change the versión of java, just right click on java and change to prior version. or go to java build path an change the server libraries, or go to server and change the server. if it not solvethe problem

First of all right click your project and then go to java compiler,Check the Compiler compliance level,Fix your correct java edition.