private PolicerId(URI u) {
        super(u.toString());
        uri = u;
    }
@Test
    public void testWrongCreation() {
        // Build not allowed string
        String wrongString = Strings.repeat("x", 1025);
        // Define expected exception
        exceptionWrongId.expect(IllegalArgumentException.class);
        // Create policer id
        PolicerId.policerId(wrongString);
    }