If I attempt to disable the JAX-RS facet in the project then I get the following error. Failed while uninstalling JAX-RS (REST Web Services) 2.0. org.eclipse.jst.javaee.web.internal.impl.WebAppImpl cannot be cast to org.eclipse.jst.j2ee.webapplication.WebApp I am attempting to disable this because I continually get errors while editing code. Posted by forums Original post: https://developer.jboss.org/message/905741#905741