rather then mucking with system properties, i find that using JNDI is the easiest and cleanest way to configure solr home with tomcat.
https://wiki.apache.org/solr/SolrTomcat#Configuring_Solr_Home_with_JNDI ...those instructions are fairly simple, and will work on both windows and linux (just with differnet paths) but someone also did a more detailed breakdown specificly for windows on the same page... https://wiki.apache.org/solr/SolrTomcat#Tomcat_on_Windows : Date: Mon, 31 Oct 2011 20:30:21 +0800 (CST) : From: 刘浪 <liu.l...@eisoo.com> : Reply-To: solr-user@lucene.apache.org : To: solr-user <solr-user@lucene.apache.org> : Subject: Can't find resource 'solrconfig.xml' : : Hi, : After I start tomcat, I input http://localhost:8080/solr/admin. It can display. But in the tomcat, I find an exception like "Can't find resource 'solrconfig.xml' in classpath or 'solr\.\conf/', cwd=D:\Program Files (x86)\apache-tomcat-6.0.33\bin". It occures before "Server start up in 1682 ms." : What should I do?Thank you very much. : : Solr Directory: D:\Program Files (x86)\solr. It contents bin, conf, data, solr.xml, and README.txt. : Tomcat Directory: D:\Program Files (x86)\apache-tomcat-6.0.33. : : Sincerely, : Amos : -Hoss