The jung project's CVS data is in read-only mode, so the project may have switched over to another source-code-management system. To check, visit the Project Summary Page for jung and see if the menubar lists a newer code repository, such as SVN or Git.
The CVS data can be accessed as follows.
You can run a per-module CVS checkout via pserver protocol:
cvs -z3 -d:pserver:anonymous@a.cvs.sourceforge.net:/cvsroot/jung co -P JUNG-DB
cvs -z3 -d:pserver:anonymous@a.cvs.sourceforge.net:/cvsroot/jung co -P api
cvs -z3 -d:pserver:anonymous@a.cvs.sourceforge.net:/cvsroot/jung co -P joshua_dev
cvs -z3 -d:pserver:anonymous@a.cvs.sourceforge.net:/cvsroot/jung co -P jung
cvs -z3 -d:pserver:anonymous@a.cvs.sourceforge.net:/cvsroot/jung co -P jung-io
cvs -z3 -d:pserver:anonymous@a.cvs.sourceforge.net:/cvsroot/jung co -P jung-jai
cvs -z3 -d:pserver:anonymous@a.cvs.sourceforge.net:/cvsroot/jung co -P jung-jai-samples
cvs -z3 -d:pserver:anonymous@a.cvs.sourceforge.net:/cvsroot/jung co -P jung-prefuse
cvs -z3 -d:pserver:anonymous@a.cvs.sourceforge.net:/cvsroot/jung co -P jung-swt
cvs -z3 -d:pserver:anonymous@a.cvs.sourceforge.net:/cvsroot/jung co -P jung2
cvs -z3 -d:pserver:anonymous@a.cvs.sourceforge.net:/cvsroot/jung co -P netsight
cvs -z3 -d:pserver:anonymous@a.cvs.sourceforge.net:/cvsroot/jung co -P speedtest
You can view a list of files or copy all the CVS repository data via rsync (the 1st command lists the files, the 2nd copies):
rsync -a a.cvs.sourceforge.net::cvsroot/jung/
rsync -ai a.cvs.sourceforge.net::cvsroot/jung/ /my/local/dest/dir/
If you are a project admin for jung, you can request that this page redirect to another repo on your project by submitting a support request.