something related to the Jetty upgrade (SOLR-632) seems to have caused this ... i can reproduce locally.
junit.framework.AssertionFailedError: We got no Cache-Control header at org.apache.solr.servlet.CacheHeaderTest.checkVetoHeaders(CacheHeaderTest.java:64) at org.apache.solr.servlet.CacheHeaderTest.testCacheVetoException(CacheHeaderTest.java:59) : See http://hudson.zones.apache.org/hudson/job/Solr-trunk/501/changes -Hoss