A DESCRIPTION OF THE REQUEST :
Some of BigDecimal's constructors, notably "BigDecimal(char[] in, int offset, int len, MathContext mc)" throw NumberFormatException with an empty message. The exception message should indicate what String could not be parsed (and, if possible, why).

JUSTIFICATION :
Including the invalid String in the exception would help developers debug parsing problems quicker when the input string is dynamically constructed, for example when parsing data off a website.