Spring Boot - All tests in a folder are excluded from coverage report - spring-boot

Question

people.
I have this Spring Boot application with some services, utilities and controllers to test.
I have written tests for all of them, 35 so far, and the 35 tests get executed correctly.
The problem is that, for some reason, when I generate code coverage reports, the classes from the service directory appear with 0 coverage, even when their corresponding tests were executed without errors, as you can see in the image below.
For instance, the Dummy and DummyTest classes are a copy from other two classes in a different package -util instead of service- and those from utils have no problem. The curse takes place only inside of service.
As an example, these are the contents of Dummy and DummyTest.
I have rewritten it without mocks, but it does not work either way:
package quality.service;
import org.springframework.stereotype.Component;
import java.util.Base64;
#Component
public final class Dummy {
private Dummy() {
}
public static String encodeStringBase64(String string) {
return Base64.getEncoder().encodeToString(string.getBytes());
}
}
//---------------------------------------------------------
package quality.service;
import org.junit.Test;
import static org.junit.Assert.assertEquals;
import static quality.service.Dummy.encodeStringBase64;
public class DummyTest {
#Test
public void testEncodeStringBase64ReturnsEmptyValue() {
assertEquals("", encodeStringBase64(""));
}
#Test
public void testEncodeStringBase64ReturnsEncodedString() {
assertEquals("VGVzdFN0cmluZ0AwMjQ1", encodeStringBase64("TestString#0245"));
}
}
Any suggestion would be really appreciated.
Screenshot