Coverage report shows less than 100%

[balazs-zsoldos]

I wrote a module that is tested and coverage tests are created with jacoco. There is the following code snippet:

    ReadLock readLock = eventsToReplayLocker.readLock();
    readLock.lock();
    try {
        eventsWithReplayFlag = new ArrayList<EventWithReplayFlag<E>>(eventsToReplay.values());
    } finally {
        readLock.unlock();
    }

All lines are green except the one in the finally block that is yellow and code coverage is not 100%. I do not see any information why it is not green. The code runs on that line for sure as it is in a finally block.

To reproduce:

• Open the following url: https://github.com/everit-org/eventdispatcher/tree/fba91c68a89dc18b0a0d83a31f9fbecb784fdda3 (it points to the commit that shows the error for sure)
• Download the source as zip
• mvn clean install
• In the target/site dir you will see the jacoco report that should be 100% but it is not.

[marchof]

Thanks for reporting this! Actually this is known behavior. JaCoCo (the library behind EclEmma) works on Java class files. The compiler creates two paths for finally blocks: One path for the exception case and another one for the non-exception case. Yellow means that one of the two paths is not covered by your test scenarion.

We have a feature request to filter certain compiler artifacts like the one you entcountered: jacoco/jacoco#15

There is also a JaCoCo/EclEmma fork which already implements filtering of finally blocks: http://mchr3k.github.io/jacoco/