Fixed Jacoco example (#2933)
Fixed Jacoco example (#2933)

This small pull request closes #2648. The previous project targeted by the example no longer seems to be using the Jacoco plugin, so I've hunted down another one:
https://img.shields.io/jenkins/j/https/builds.apache.org/job/Derby-JaCoCo.svg 
![](https://img.shields.io/jenkins/j/https/builds.apache.org/job/Derby-JaCoCo.svg)
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