Incorrect JSF Phase Listener Warning ------------------------------------ Key: JBIDE-21113 URL: https://issues.jboss.org/browse/JBIDE-21113 Project: Tools (JBoss Tools) Issue Type: Bug Components: jsf Affects Versions: 4.3.0.Final Environment: Mars.1 Java 8 Reporter: Cody Lerum Fix For: 4.3.x, 4.4.x When adding a JSF phase listener to faces-config.xml {code} <lifecycle> <phase-listener>com.demo.web.jsf.JsfCdiPhaseListener</phase-listener> </lifecycle> {code} You are presented a warning that {{phase-listener references to "com.demo.web.jsf.JsfCdiPhaseListener" that does not extend javax.faces.event.PhaseListener}} In reality you cannot extend javax.faces.event.PhaseListener you must implement it. So this check should be looking for implements rather than extends. See http://balusc.omnifaces.org/2006/09/debug-jsf-lifecycle.html In java 8 at least you get a compiler error if you try and extend avax.faces.event.PhaseListener. The type PhaseListener cannot be the superclass of JsfCdiPhaseListener; a superclass must be a class