ConflictTests.java

public class ConflictTests {
	@Test
	void tryToNoticeConflictingAnnotations() throws Exception {
		Conflicting c = new Conflicting();
		Method m = c.getClass().getDeclaredMethod("method");
		List<MergedAnnotation<PreAuthorize>> found = MergedAnnotations
				.from(m, MergedAnnotations.SearchStrategy.TYPE_HIERARCHY, RepeatableContainers.none())
				.stream(PreAuthorize.class).filter(MergedAnnotation::isPresent).toList();
		assertThat(found).hasSize(2);
		assertThat(found.get(0).getAggregateIndex())
				.isEqualTo(found.get(1).getAggregateIndex());
	}

	private interface A {

		@PreAuthorize("A")
		String method();

	}

	private interface B {

		@PreAuthorize("B")
		String method();

	}

	private static class Conflicting implements A, B {

		@Override
		public String method() {
			return "ok";
		}

	}
}