RESTful Java Web Services - Third Edition

A brief introduction to Bean Validation

The Bean Validation framework allows you to specify the validation rules in the form of annotations on a field, method, or a Java class. You can either use built-in constraints offered by Bean Validation or build custom constraints by using the extension mechanisms offered by the framework. The following table summarizes the built-in constraints offered by Bean Validation that are applicable to all data types:

Validation constraints	Supported Java types	Details of the imposed constraints
@NotNull	Applicable to all Java types	The annotated variable must not be null.
@Null	Applicable to all Java types	The annotated variable must be null.

 

The following table summarizes the ...