Validating the value

Check out this video for a quick data validation overview.You can download an example workbook with all of the data validation examples you'll find in this article.See Validating Persistent Fields and Properties for more information on using validation constraints.The Java programming language distinguishes between null and empty strings.This means the validation engine directly accesses the instance variable and does not invoke the property accessor method even if such an accessor exists.Constraints can be applied to fields of any access type (public, private etc.).The best thing about using a table is that as you add or remove items from your list, your data validation list will update automatically.Note: The following examples use the Custom option where you write formulas to set your conditions.

Note: You must enter the data validation formula for cell A2 first, then copy A2 to A3: A10 so that the second argument to the COUNTIF will match the current cell.In this section you will learn how to enhance an object model with these annotations.There are the following three types of bean constraints: When using field-level constraints field access strategy is used to access the value to be validated.If you are interested in applying constraints to method parameters and return values, refer to Chapter 3, Declaring and validating method constraints.Constraints in Bean Validation are expressed via Java annotations.

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