what is a portlet Bridge?

If you want to expose an existing web application as a portlet, you’ll need to use a portlet bridge.

A portlet bridge is responsible for making your existing web application compatible with the portlet specification.

 For instance, if you want to expose an existing JavaServer Faces (JSF) application as a portlet, you could do so by using the reference implementation for JSR 301 (Portlet 1.0 Bridge for JSF1.2) or JSR 329 (Portlet 2.0 Bridge for JSF 1.2) from the MyFaces Portlet Bridge
project (http://myfaces.apache.org/portlet-bridge/index.html).