: Further info: I can make this work if I stay out of tomcat -- I : download a fresh solr binary distro, copy those five JARs from 'dist' : and 'contrib' into example/solr/lib/, copy my solrconfig.xml and : schema.xml, and run 'java -jar start.jar', and it works fine. But : trying to add those same JARs to my tomcat instance's solrhome/lib : doesn't work. Any ideas how to troubleshoot?
is there anything else about how you have tomicat+solr configured that might be causing tomcat to load *any* solr or lucene jars directly, instead of letting the solr.war file load them from your solr home dir? did you change anything about tomcat's classpath? did you copy any jars anywhere other then your solrhome/lib dir? these kinds of "classloader hell" errors can happen if a parent classloader has already loaded some class that depends on (or is depended on by) a another class loaded by the solr war. -Hoss
