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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.
All these constraints apply to the field/property level, there are no class-level constraints defined in the Bean Validation specification.
If you are using the Hibernate object-relational mapper, some of the constraints are taken into account when creating the DDL for your model (see column "Hibernate metadata impact").
Example 2.2, “Property-level constraints” uses the same entity as in Example 2.1, “Field-level constraints”, however, property level constraints are used.
Table 2.2, “Bean Validation constraints” shows purpose and supported data types of all constraints specified in the Bean Validation API.Constraints on static fields are not supported, though.If your model class adheres to the Java Beans standard, it is also possible to annotate the properties of a bean class instead of its fields.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.