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Bean Validation constraints may be applied to persistent entity classes, embeddable classes, and mapped superclasses.

By default, the Persistence provider will automatically perform validation on entities with persistent fields or properties annotated with Bean Validation constraints immediately after the lifecycle events.

Put the two jar files mentioned above to the application’s classpath and add the following entry to Spring’s application context XML file: Typically, we would return the input form back to the user when any validation errors occurred.

And in the JSP form, we can show validation error messages using the Spring’s form errors tag as follows: But after getting server side validation errors if we go back and then go forward or if we refresh that page will get confirm form re-submission problem.

JSR 303 for Bean Validation 1.0 and JSR 349 for Bean Validation 1.1).Custom constraints can be specific combinations of the default constraints, or new constraints that don’t use the default constraints.Each constraint is associated with at least one validator class that validates the value of the constrained field or property.a "personal_info" and a domain, that is [email protected] The length of the personal_info part may be up to 64 characters long and domain name may be up to 253 characters. The personal_info part contains the following ASCII characters. To get a valid email id we use a regular expression /^\w ([\.-]?

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