Solr on Tomcat 5.5 needs xalan.jar

[carteriii]

I had a Tomcat 6.x instance running Solr at home with no problem, but couldn't get Solr to run here on my Rimu/Ubuntu server using the default install of Tomcat 5.5. The logs weren't much of a help, except that I found some other post on the web indicating that xalan.jar was required. Sure enough, simply dropping xalan.jar into tomcat/common/lib got things working immediately.

I hope this helps someone else down the road.