RichFaces DocumentBuilder performance issue

Issue

• The Richfaces creates a org.apache.xerces.jaxp.DocumentBuilder instance for each request. This causes bad performance.
• We have profiled out application and it seems 80+% of the object allocations are org.ajax4jsf.context.ResponseWriterContentHandler. calling javax.xml.parsers.DocumentBuilderFactory.newInstance() at least once for every page request.