This change works around the issue by making the CWD for the Solr module tests be solr/build/tests/solr/, which does not contain solr/conf/, so the remainder of the classpath is searched, and the absolute classpath element .../solr/build/tests/ allows the source home to be located.
git-svn-id: https://svn.apache.org/repos/asf/lucene/dev/trunk@1054464 13f79535-47bb-0310-9956-ffa450edef68