java如何抛出适合抽象的异常

private void serializeBillingDetails(BillingResult billingResult,
        BillingDetailsType billingDetails) {
 
    try {
        final JAXBContext context = JAXBContext
                .newInstance(BillingdataType.class);
        final ByteArrayOutputStream out = new ByteArrayOutputStream();
        final Marshaller marshaller = context.createMarshaller();
        marshaller.setProperty("jaxb.formatted.output", Boolean.FALSE);
        final BillingdataType billingdataType = new BillingdataType();
        billingdataType.getBillingDetails().add(billingDetails);
        marshaller.marshal(factory.createBillingdata(billingdataType), out);
        final String xml = new String(out.toByteArray(), "UTF-8");
        billingResult.setResultXML(xml.substring(
                xml.indexOf("<Billingdata>") + 13,
                xml.indexOf("</Billingdata>")).trim());
        billingResult.setGrossAmount(billingDetails.getOverallCosts()
                .getGrossAmount());
        billingResult.setNetAmount(billingDetails.getOverallCosts()
                .getNetAmount());
    } catch (JAXBException | UnsupportedEncodingException ex) {
        throw new BillingRunFailed(ex);
    }
}