@Override
    public boolean canHandleReturnType(Class returnType) {
        return (Flux.class.isAssignableFrom(returnType)) || (Mono.class
            .isAssignableFrom(returnType));
    }
@Test
    public void testCheckTypes() {
        assertThat(reactorRetryAspectExt.canHandleReturnType(Mono.class)).isTrue();
        assertThat(reactorRetryAspectExt.canHandleReturnType(Flux.class)).isTrue();
    }