Validating domain objects hibernate part 5
These include the following present and former expert group members in alphabetical order: Validating data is a common task that occurs throughout an application, from the presentation layer to the persistence layer.Often the same validation logic is implemented in each layer, proving to be time consuming and error-prone.The constraint annotation is applied on types, methods, fields or other constraint annotations in case of composition.Unless stated otherwise the default package name for the Bean Validation APIs is * annotation which refers to its list of constraint validation implementations.It is specifically not tied to either the web tier or the persistence tier, and is available for both server-side application programming, as well as rich client Swing application developers.This API is seen as a general extension to the Java Beans object model, and as such is expected to be used as a core component in other specifications.
In Appendix A, Terminology, key concepts are summarized.
This work is being conducted as part of JSR 303 under the Java Community Process Program.
This specification is the result of the collaborative work of the members of the JSR 303 Expert Group.
The constraint annotation definitions may define additional elements to parameterize the constraint. */ @Documented @Constraint(validated By = Audible Validator.class) @Target() @Retention(RUNTIME) public @interface Audible Example 2.3, “Constraint definition with default parameter” ensures that a given frequency is within the scope of human ears.
For example, a constraint that validates the length of a string can use an annotation element named package constraint; /** * Mark a String as representing a well formed order number */ @Documented @Constraint(validated By = Order Number Validator.class) @Target() @Retention(RUNTIME) public @interface Order Number package constraint; /** * A frequency in Hz as audible to human ear. The constraint definition includes an optional parameter that may be specified when the constraint is applied.package constraint; /** * Defines the list of values accepted * Accepts int or Integer objects */ @Documented @Constraint(validated By = Discrete List Of Integer Validator.class) @Target() @Retention(RUNTIME) public @interface Acceptable constraint, which validates that its target matches a specified regular expression. The same constraint type can belong to different groups and have specific error messages depending on the targeted group.
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It is also recommended to use the following convention: the resource bundle key should be the fully qualified class name of the constraint annotation concatenated to group is considered declared. Groups are typically used to control the order in which constraints are evaluated, or to perform validation of the partial state of a Java Bean./** * Payload type that can be attached to a given * constraint declaration.