[Java] Coverage report could not be created with the combination of default method of Cobertura + interface

It's just the title ... I wasted my time and had a disappointing experience, so I would like to share it.

Cobertura's coverage report generation got an error on the way.

While researching various things, ・ Development of Cobertura stopped a long time ago ・ Lambda expression cannot be tracked I found the information.

The source did not use a lambda expression, but it used the default method of interface, so I tried changing it to a different implementation method and it worked.

I spent a few hours noticing this ...

Reference link
Coverage tool Cobertura has stopped development Code not tracked by Cobertura

Today's lesson. ** If you use Cobertura, don't use the features added since Java 8. ** **

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