Parametros.java

public List<ValidacaoException> validar() throws Exception {

	List<ValidacaoException> problemas = new ArrayList<ValidacaoException>();

	for (Method method : this.getClass().getDeclaredMethods()) {
		if (method.getName().startsWith("validar") && !method.getName().equals("validar")) {
			try {
				method.invoke(this);
			} catch (InvocationTargetException e) {
				problemas.add((ValidacaoException) e.getCause());
			} catch (Exception e) {
				throw e;
			}
		}
	}

	return problemas;
}

public void validarFaixaDeValores() throws ValidacaoException {
	if (valorInicial != null && valorFinal != null && valorInicial.compareTo(valorFinal) > 0) throw new ValidacaoException("valor.inicial.maior.que.final");
}

public void validarPeriodo() throws ValidacaoException {
	if (dataInicial != null && dataFinal != null && dataInicial.after(dataFinal)) throw new ValidacaoException("data.inicial.maior.que.final");
}