Hibernate Annotations are based on the JPA 2 specification. Class name defaults to Table name and field names defaults to column names 1.3 Reference Guide on Hibernate Annotations. Instead of adding Java Bean Validation annotations to JPA entities, we will add Java Bean Validation annotations to DTO because we will use DTO in the request and response of the REST API. Annotations are preconfigured with sensible default values, which reduce the amount of coding required. It is basically used to pass data with multiple attributes in one shot from client to server, to avoid multiple calls to a remote server. We create and use DTOs (Data Transfer Objects) to transform data between client and server.ĭata Transfer Object Design Pattern is a frequently used design pattern. JSR 380 is a specification of the Java API for bean validation and this ensures that the properties of a bean meet specific criteria, using annotations such as and Validator is the reference implementation of the validation API. Field access which means that it maps the instance variables (fields) to columns in the database and Property access which means that is uses the getters to determine the property names that will be mapped to the db. In Java, the Java Bean Validation framework has become the de-facto standard for handling validations in Java projects.
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