[Error]Project facets

Object

When you come into the error of farcets, What should I do?

You'd better check the version of java below.

• Project compiler version
  
• Project jre version
  
• Project > Properties > Project Facets.
  

Referred links

• http://download.oracle.com/docs/cd/E13226_01/workshop/docs92/ws_platform/ideuserguide/conFacets.html