Seam2.3 examples config files contain old Seam namespaces:

e.g.: booking/booking-web/src/main/webapp/WEB-INF/components.xml:

<components xmlns="http://jboss.com/products/seam/components"
            xmlns:core="http://jboss.com/products/seam/core"
            xmlns:security="http://jboss.com/products/seam/security"
            xmlns:transaction="http://jboss.com/products/seam/transaction"
            xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
            xsi:schemaLocation=
                "http://jboss.com/products/seam/core http://jboss.com/products/seam/core-2.3.xsd
                 http://jboss.com/products/seam/transaction http://jboss.com/products/seam/transaction-2.3.xsd
                 http://jboss.com/products/seam/security http://jboss.com/products/seam/security-2.3.xsd
                 http://jboss.com/products/seam/components http://jboss.com/products/seam/components-2.3.xsd">


They need to be updated to "http://jboss.org/schema/seam"