Dear Jens,
this is indeed a known limitation. Not because of the default method, but
because of the exception which is always thrown. See FAQ
<https://www.jacoco.org/jacoco/trunk/doc/faq.html>:
> Source code lines with exceptions show no coverage. Why?
>
> JaCoCo determines code execution with so called probes. Probes are inserted
> into the control flow at certain positions. Code is considered as executed
> when a subsequent probe has been executed. In case of exceptions such a
> sequence of instructions is aborted somewhere in the middle and the
> corresponding lines of source code are not marked as covered.
>
Regards,
-marc
> On 13. Jun 2024, at 13:03, 'Jens Kaiser' via JaCoCo and EclEmma Users
> <jacoco@googlegroups.com> wrote:
>
> Hi *,
>
> one of my projects contains an interface with some default methods.
>
> public interface ExpressionVisitor<I, O> {
> default O handleWithException(Object expression) {
> throw new UnsupportedOperationException("unsupported");
> }
>
> default O visit(Node expression, I input) {
> return handleWithException(expression);
> }
> }
>
> The visit method is called directly in some tests an is never overridden. But
> only the handleWithException coverage can be found, not the coverage of the
> visit method. In the Intellij coverage tool I can see the coverage for visit.
>
> Is this a known limitation of jacoco?
>
> Thank you in advance.
>
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