1) Anytime the Lucene Jar is updated, a notation is added to CHANGES.txt, and the svn commit message should have the specifics on the jar like this..
http://svn.apache.org/viewvc/lucene/solr/trunk/lib/lucene-core-2.4-dev.jar?view=log 2) the Solr Admin screen is just displaying what's listed in the MANIFEST for the Lucene Jar, so you can fetch that directly w/o running Solr. 3) ... : Huh, looks like looking at the Solr admin doesn't always help. I just ... : Lucene Implementation Version: 2008-08-27_02-04-10 ${svnversion} - : 2008-08-27 02:13:53 : : I feel like I've previously seen ${svnversion} expanded into a : concrete number on this page. That's because that build probably came from Hudson, previous builds probably came from people building them manually (INFRA-1721 is why Hudson builds of Lucene-Java don't have svnversion expanded at the moment) -Hoss