@Override
	public void setNumberFormat(NumberFormat numberFormat) {
		Assert.notNull(numberFormat, "The provided numberFormat must not be null.");
		super.setNumberFormat(numberFormat);
	}
Setter for the {@link NumberFormat} which is set on the underlying {@link DefaultJobParametersConverter}. If not
set explicitly, defaults to {@code NumberFormat.getInstance(Locale.US);}

@param numberFormat Must not be null.
spring-xd-dirt/src/main/java/org/springframework/xd/dirt/plugins/job/ExpandedJobParametersConverter.java