I've configured a sample Apache Solr 4.1 installation using this tutorial. The sample
http://localhost:8090/solr (changed the port in server.xml) worked and redirected me to
http://localhost:8090/solr/admin with some output.
Now, I've upgraded to Solr 4.3 by stopping tomcat6, removing /var/lib/tomcat6/webapps/solr.war and solr, replacing the solr.war with the new one. After starting tomcat6, /var/lib/tomcat6/webapps/solr gets recreated.
http://localhost:8090/solr now throws a 404.
HTTP Status 404 - /
type Status report
description The requested resource () is not available.
It is strange, that it shows no paths, but only when I try to reach something in /solr. When I type in something random, the paths show up correctly in the 404, so something seems to be done by tomcat, but it is not correct.