EMMA (code Coverage Tool)
EMMA is an open source toolkit for measuring and reporting Java code coverage. EMMA is distributed under the terms of Common Public License v1.0.
EMMA is not currently under active development; the last stable release took place in mid-2005. EMMA works by wrapping each line of code and each condition with a flag, which is set when that line is executed.
Read more about EMMA (code Coverage Tool): Features, Alternatives, EMMA-based Tools