From Martin KoÄ�í: EL 2.2 introduces method invocation but if you try use it like rendered="#{bean.getRendered(param)}" there is an unpleasant surprise: both implementations of BeanELResolver (Glassfish, Tomcat) use this construction during method invocation: ExpressionFactory exprFactory = ExpressionFactory.newInstance(); That newInstance() always involves FactoryFinder mechanism, callstack then looks like : org.apache.catalina.loader.WebappClassLoader.findResourceInternal org.apache.catalina.loader.WebappClassLoader.findResource org.apache.catalina.loader.WebappClassLoader.getResourceAsStream javax.el.FactoryFinder.find(String, String, Properties) javax.el.ExpressionFactory.newInstance(Properties) javax.el.ExpressionFactory.newInstance() javax.el.BeanELResolver.invokeMethod(Method, Object, Object[]) Always tries to locale factory implementation, that means /META-INF/services reading! This is not problem in myfaces, but users don't distinguish between JSF and EL well.