When a value for a parameter of type `BigDecimal` is converted by `XWorkBasicConverter` (this is default Struts2 behavior), a failure occurs when there is a space in the value. The parent to `XWorkBasicConverter`, `DefaultTypeConverter`, has a `stringValue` method that could could be used instead of immediately casting to a String, e.g., `new BigDecimal((String) value)`, which is what ultimately appears to cause a `NumberFormatException` to be thrown from the `BigDecimal` constructor when there is a space in the value.
For example, in version 184.108.40.206, the following lines could be changed as indicated:
403: return new BigDecimal(stringValue(value, true));
405: return new BigInteger(stringValue(value, true));
408: String stringValue = stringValue(value, true);
414: String stringValue = stringValue(value, true);
In fact, at the end of the doConvertToNumber method (where the previous lines reside), as a catch-all, the parameters are passed to the DefaultTypeConverter's `convertValue` method which calls the `bigDecValue` method which calls the `stringValue` method (when all the conditionals align).