To enable Seam's exception handling, the master Servlet filter must be declared in
web.xml:
<filter> <filter-name>Seam Filter</filter-name> <filter-class>org.jboss.seam.servlet.SeamFilter</filter-class> </filter> <filter-mapping> <filter-name>Seam Filter</filter-name> <url-pattern>*.seam</url-pattern> </filter-mapping>
For the exception handlers to fire, you must disable Facelets development mode in
web.xml and Seam debug mode in components.xml.