Colt library is pretending to provide "Dense and sparse fixed sized (non-resizable) 1,2, 3 and d-dimensional matrices" (Section Features / Templated Multidimensional matrices).
But in API itself I see no any implementation, higher than 3: http://acs.lbl.gov/ACSSoftware/colt/api/cern/colt/matrix/package-summary.html
Please cure my tired eyes :)