如何驗證jsf中雙精度型的空值？

Question

I have the jsf input text as double type in pojo class. 
i want to validate that field with empty check.by default in page load the value comes as 0.0 in the text field.once i clear the value(i.e empty value) and click submit button, the text field is not getting validated. 

任何幫助，將不勝感激。

Answer 1

如果你希望它出現空比你可以從double（原始）變成Double（對象）

和字段設置爲required="true"