"fernando_jmt" wrote : And, also tell us where is located your field.xhtml? | | webapp/ ? | webapp/WEB-INF? | ...etc. | Thank you for the prompt reply. This is exactly the reason. I've placed taglib file and the component source into /WEB-INF/facelets/tags/my.taglib.xml (as you can see from my web.xml), but Seam deployment script ignores subdirectories in WEB-INF. I've moved both into WEB-INF and it works :-) !!!! Composition Components is a very powerfull feature I missed e.g. with Turbine + Velocity, not saying about PHP & Co. Now I can present our decision makers another strong argument for migration to Seam + JSF + Facelets. anonymous wrote : Post the page where you are using the composition tag. Before: ... | <ui:composition xmlns="http://www.w3.org/1999/xhtml" | xmlns:s="http://jboss.com/products/seam/taglib" | xmlns:ui="http://java.sun.com/jsf/facelets" | xmlns:f="http://java.sun.com/jsf/core" | xmlns:h="http://java.sun.com/jsf/html" | xmlns:rich="http://richfaces.ajax4jsf.org/rich" | xmlns:my="http://my.com/jsf" | template="layout/template.xhtml"> | ... | <h:outputLabel for="username">Username</h:outputLabel> | <h:inputText id="username" | value="#{identity.username}"/> | <h:outputLabel for="password">Password</h:outputLabel> | <h:inputSecret id="password" | value="#{identity.password}"/> | ... After: ... | <ui:composition xmlns="http://www.w3.org/1999/xhtml" | xmlns:s="http://jboss.com/products/seam/taglib" | xmlns:ui="http://java.sun.com/jsf/facelets" | xmlns:f="http://java.sun.com/jsf/core" | xmlns:h="http://java.sun.com/jsf/html" | xmlns:rich="http://richfaces.ajax4jsf.org/rich" | xmlns:my="http://my.com/jsf" | template="layout/template.xhtml"> | ... | <my:field label="Username" fieldName="username" entity="#{identity}" /> | <my:field label="Password" fieldName="password" entity="#{identity}" secret="true" /> | ... View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=4046043#... Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&a...