Hi, Sorry I just wanted to add that I only ever had errors about missing commons-logging.jar, not about httpcore.jar or others. I fixed the error by creating a symlink in /usr/share/solr/WEB-INF/lib: commons-logging.jar -> ../../../java/commons-logging.jar
commons-logging.jar is supplied by libcommons-logging-java, I don't remember if I had to install it manually or it was already in the dependency tree of solr/tomcat.
