: The only problem is changed protocols, old client application does not : understand new XML responses from server. It recalls some very old
Can you elaborate on what "XML responses" have changed for you? To the best of my knowledge any solrconfig.xml that worked with Solr 1.1 will continue to work with 1.2 and provide the same XML response for updates commands. The XmlResponseWriter for queries supports a version param to ensure that even if it changes overtime, you can always get the response format you expect -- but i don't think it had a version bump in Solr 1.2 -Hoss
