JaCoCo appears to overcount switch statements

[tgoldenatwork]

I am viewing unit test coverage in Sonar using JaCoCo. For a switch statement with three cases and a default block, with explicit breaks after each case, JaCoCo tells me I need to cover 10 paths. Now, this number would seem to make sense if each case fell through (4 + 3 + 2 + 1) but not when I explicitly break after each. Am I misunderstanding this number, or is this actually incorrect?

[marchof]

What is the type of the switch variable?

[tgoldenatwork]

It's a switch over a String, which was introduced in Java 7.

[marchof]

This a known limitation: The compiler creates a switch statement on the hashcode and an additional equals check on every case. Future versions of JaCoCo might provide a filter for this. See issue #15.