在Tapestry BeanEditor中允许Number对象为null

Question

I have an object I'd like to edit via beaneditor. One of the properties is of the Number class.

When I try to display the beaneditor, I get the following error:

Parameter 'translate' of component core/PropertyEditBlocks:numberfield is bound to null. This parameter is not allowed to be null.

When I changed the variable type to Double , everything worked fine.

Does it have anything to do with the fact that Number is an abstract class and cannot be instantiated? In that case, should I provide some sort of a translator or something like that so it uses, Double for example, when editing the value?

Answer 1

TextField 's require a translate parameter. Tapestry has defaults registered for String, Integer, Long etc. Since tapestry can't find a org.apache.tapestry5.FieldTranslator it's complaining.

Solutions:

1. Use a concrete type instead of Number
2. Explicitly pass a FieldTranslator to the TextField (eg set the translate parameter)
3. Register a FieldTranslator for Number (this sounds crazy to me).