CommaBigDecimalAdapter

public class CommaBigDecimalAdapter extends XmlAdapter<String, BigDecimal> {
    private final DecimalFormat format;

    public CommaBigDecimalAdapter() {
        DecimalFormatSymbols symbols = new DecimalFormatSymbols();
        symbols.setDecimalSeparator(',');

        format = new DecimalFormat();
        format.setDecimalFormatSymbols(symbols);
        format.setParseBigDecimal(true);
        format.setGroupingUsed(false);
        format.setMaximumFractionDigits(Integer.MAX_VALUE);
    }

    @Override
    public BigDecimal unmarshal(String v) throws ParseException {
        return (BigDecimal) format.parse(v);
    }

    @Override
    public String marshal(BigDecimal v) {
        return format.format(v);
    }
}