PortletRequestContextImpl doesn't encode/decode attributes whose names start with java. or javax. with the portlet instance namespace/prefix. The JSF portlet bridge has defined specific request attributes (that begin with javax.) that are per instance based. What is the rationale for not encoding all request attributes so they are managed on a per portlet instance basis? At a minimum we need a fix that allows some/the bridge's attributes to be properly encoded so that collisions on the same page don't occur.