This example is currently broken because of a bug in Tacos 4.1.0 release. It's since fixed in 4.1.1-SNAPSHOT (but we couldn't release 1.1 with snapshot dependencies.). This example needs a version where the following problem is corrected: The 4.1.0 release has a bug in "tacos.services.xml". The TemplateBindingFactory declaration is wrong, it is: construct class="org.apache.tapestry.binding.TemplateBindingFactory" when it should be: construct class="net.sf.tacos.binding.TemplateBindingFactory"