Remove DummyTest as now there are real tests

Signed-off-by: Alin Dreghiciu <adreghiciu@gmail.com>
Split exception package into errors/validation

Signed-off-by: Alin Dreghiciu <adreghiciu@gmail.com>
JavaDoc

Signed-off-by: Alin Dreghiciu <adreghiciu@gmail.com>