The download URL for JUnit currently hardcoded in buid/component/junit.xml has changed. Attached is a patch which refers to an up-to-date URL: http://sourceforge.net/projects/junit/files/junit/4.2/junit4.2.zip/download?use_mirror=autoselect. (This URL does not a-priori fix a mirror to use, but rather redirects to an appropriate one on access.)
patch committed in r16034. Thanks!
bulk close of all resolved issues in preparation for 3.1.3 release.