Did you download the JDK6 variant of JBoss AS 5.0.1.GA? It already has the necessary jar files in the endorsed directory to avoid this issue:
lib/endorsed/activation.jar
lib/endorsed/jaxb-api.jar
lib/endorsed/jbossws-native-jaxrpc.jar
lib/endorsed/jbossws-native-jaxws-ext.jar
lib/endorsed/jbossws-native-jaxws.jar
lib/endorsed/jbossws-native-saaj.jar
lib/endorsed/resolver.jar
lib/endorsed/serializer.jar
lib/endorsed/stax-api.jar
lib/endorsed/xalan.jar
lib/endorsed/xercesImpl.jar
A search of "setProperty must be overridden" should yield several posts discussing this. (It it should, if search was not broke - at this time only your post shows up.)
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anonymous wrote : GRAVE: Error configurando escuchador de aplicación de clase com.sun.faces.config.ConfigureListener
| java.lang.ClassNotFoundException: com.sun.faces.config.ConfigureListener
Looks like you are using JSF in your web app. JBoss Web does not come with the JSF libraries so you need to package them within your web app. I am not sure, offhand, how to convince Eclipse to do that (I usually use Maven or Ant to package and deploy).
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