When I created a project in Eclipse Kleper to use spring I generated a couple of errors, I read that installing Tomcat would not have problems but it still generates me.
Error 1: An internal error occurred during: "Validating Practice". org.eclipse.jst.j2ee.project.facet.IJ2EEFacetConstants
Error2: Error during build of project [Practica] Error occurred during the build Errors running builder 'Faceted Project Validation Builder 'on project' Practice '. java.lang.ExceptionInInitializerError Errors running builder 'Validation' on project 'Practice'. org.eclipse.jst.j2ee.project.facet.IJ2EEFacetConstants