I have build my own BigDecimalTranslator, because this translator was not
in the current Tapestry Release 5.0.5.
The textfield on my html page has a BigDecimalTranslator attached. But when
the textfield is empty and I submit the page it results in a
NullpointerException:
Coercion of null to type java.math.BigDecimal (via null --> String, String
--> java.math.BigDecimal) failed: *java.lang.NullPointerException
*
Below is the my BigDecimalTranslator Java class, it is almost the same as
other Translator Classes
These classes also return null when the clientValue is blank. But why do I
get a nullpointer then?
*public* *class* BigDecimalTranslator *implements* Translator<BigDecimal>
{
*private* NumberFormat nf = NumberFormat.*getInstance*(Locale.*GERMAN*);
/**
* Parses blank values to null, otherwise parses the client value to a
BigDecimal
*
* [EMAIL PROTECTED] ValidationException
* if the clientValue can not be parsed
*/
*public* BigDecimal parseClient(String clientValue, Messages messages) *
throws* ValidationException
{
*if* (InternalUtils.*isBlank*(clientValue)) {
*return* *null*;
}
*try
*
{
*return* *new* BigDecimal(nf.parse(clientValue.trim()).toString());
}
*catch* (NumberFormatException ex)
{
*throw* *new* ValidationException(messages.format("number-format-exception",
clientValue));
}
*catch* (ParseException ex)
{
*throw* *new* ValidationException(messages.format("number-parse-exception",
clientValue));
}
}
/**
* Converts null to the blank string, non-null to a string representation.
*/
*public* String toClient(BigDecimal value)
{
*return* value == *null* ? "" : nf.format(value).toString();
}
}
