Jamon is a text template engine for Java, useful for generating dynamic HTML, XML, or any text-based content. In a typical Model-View-Controller architecture, Jamon clearly is aimed at the View (or presentation) layer.
Japano is a java-servlet based webapplication toolkit and engine. It offers easy website logic and HTML form creation and offers integration of dynamic javascript updates ( AJAX). A sample webapp makes it easy to start developing with japano.