Google Summer of Code comes up trumps

JaCoCo meets Jenkins in new Java continuous code coverage plugin

Chris Mayer

Keeping an eye on the brightest sparks entering Google’s Summer of Code is no easy task, and we managed to miss the really cool Jenkins JaCoCo plugin from Ognjen Bubalo. Check it out

Keeping track of all the projects
emerging from this year’s
Google Summer of Code
is a tricky process at the
best of times. With 1,212 proposals accepted for this year’s free
and open source software summer coding project, you’d be forgiven
for missing some fresh new takes from some prodigious

One such example that we didn’t spot is a
from Ognjen Bubalo,
who chose
to merge the worlds of the Java
code coverage tool JaCoCo and continuous integration server
Jenkins. The result is the first plugin (to our knowledge) that
allows the user to integrate the Java code coverage report into
automated builds. This was often a big limitation for CI servers,
with neither Hudson or Jenkins
providing this option
. You could get it into your build
through some laborious workaround, but it felt unnatural and
With more than 300 plugins already
appearing under the Jenkins banner, it’s a slight surprise that no
one had thought to take this on before.

Through a little bit of ingenuity from Bubalo,
Jenkins advocates can now use the
OSGi bundle library to their heart’s content. The plugin itself is
a fork of the
Emma Jenkins plugin (Emma being the
forerunner to Jacoco) and bares striking visual similarities when
showing your Java code coverage across the project. Jenkins
, Kohsuke Kawaguchi has given his
seal of approval to the plugin,
even contributing to
the source code

It’s a plugin that was greatly needed for the Java community,
and getting the bare bones together was a big undertaking. Now it’s
here (with two updates since Summer of Code began) this plugin has
potential to go far, when generating coverage of Java unit tests.
Why not give it a look at the
and the plugin

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