I'm trying to deploy web application containing facelets 1.1.14, jsf 1.2 and spring 2.5 and I'm getting this mistake: 09:34:44,119 ERROR [[/Projekt]] Exception sending context initialized event to listener instance of class com.sun.faces.config.ConfigureListener | java.lang.LinkageError: loader constraint violation: when resolving interface method "javax.servlet.jsp.JspApplicationContext.getExpressionFactory()Ljavax/el/ExpressionFactory;" the class loader (instance of org/jboss/classloader/spi/base/BaseClassLoader) of the current class, com/sun/faces/config/ConfigureListener, and the class loader (instance of org/jboss/classloader/spi/base/BaseClassLoader) for resolved class, javax/servlet/jsp/JspApplicationContext, have different Class objects for the type javax/el/ExpressionFactory used in the signature | at com.sun.faces.config.ConfigureListener.registerELResolverAndListenerWithJsp(ConfigureListener.java:1638) at com.sun.faces.config.ConfigureListener.contextInitialized(ConfigureListener.java:455) I have following libs in my project: | com.springsource.org.jboss.el-2.0.0.GA.jar | commons-logging.jar | el-api-1.0.jar | el-impl-1.0.jar | glassfish.jsf_1.2.3.2.jar | glassfish.jstl_1.2.0.1.jar | javax.jsf_1.2.0.0.jar | jsf-facelets.jar | ognl-2.6.9.jar | org.springframework.binding-2.0.5.RELEASE.jar | org.springframework.faces-2.0.5.RELEASE.jar | org.springframework.js-2.0.5.RELEASE.jar | org.springframework.webflow-2.0.5.RELEASE.jar | spring.jar | spring-webmvc.jar | | | Thanks for all responses. View the original post : http://www.jboss.org/index.html?module=bb&op=viewtopic&p=4209388#... Reply to the post : http://www.jboss.org/index.html?module=bb&op=posting&mode=reply&a...