Project Facets doesn't have 1.8 as option for java.

Java compiler level does not match the version of the installed Java project facet. PROJECT_ABC123 Unknown Faceted Project Problem (Java Version Mismatch)





source URL: https://stackoverflow.com/questions/28995358/getting-project-facet-java-version-1-8-is-not-supported-in-eclipse-luna

I solved the problem. Go to Project Properties -> Project Facets -> Runtime -> New -> Add a tomcat server and in JRE select JRE1.8.0_XX.