I was getting "Cannot find types for `…." on objects that I knew to exist when calling semantic-is-complete-symbol-menu. Enabled debug on error and found Wrong number of arguments when calling semantic-analyze-find-tag-sequence.
Once I edited db-javap.el and added the last two arguments on line 106 everything worked again.
(sequence &optional scope typereturn throwsym &rest flags)
I am using Emacs 24.3 from emacsforosx.com
and the latest bzr copy of cedet. Could I have something jacking up the expected arguments or is this a bug?