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Cobertura is an open-source tool for measuring code coverage. It does so by instrumenting the byte code. It was the predecessor to JaCoCo.

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. As replacement, JaCoCo was developed.cite-ref-22[22] EMMA works by wrapping each line of code and each condition with a flag, which is set when that line is executed.cite-ref-23[23]

• instrument classes for coverage either offline (before they are loaded) or on the fly (using an instrumenting application classloader).

• Supported coverage types: class, method, line, basic block. EMMA can detect when a single source code line is covered only partially.

• Coverage stats are aggregated at method, class, package, and "all classes" levels.

• Output report types: plain text, HTML, XML. All report types support drill-down, to a user-controlled detail depth. The HTML report supports source code linking.

• Output reports can highlight items with coverage levels below user-provided thresholds.

• Coverage data obtained in different instrumentation or test runs can be merged.

• it is possible to dump or reset coverage data remotely and without a JVM exit.

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