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Create XML Schema with Eclipse IDE - Part 1
Further reading Preface Validating data is a common task that occurs throughout all application layers, from the presentation to the persistence layer. Often the same validation logic is implemented in each layer which is time consuming and error-prone. To avoid duplication of these validations, developers often bundle validation logic directly into the domain model, cluttering domain classes with validation code which is really metadata about the class itself. JSR - Bean Validation 2. The default metadata source are annotations, with the ability to override and extend the meta-data through the use of XML. The API is not tied to a specific application tier nor programming model. It is specifically not tied to either web or persistence tier, and is available for both server-side application programming, as well as rich client Swing application developers. Hibernate Validator is the reference implementation of this JSR Hibernate Validator 6 and Bean Validation 2. Getting started This chapter will show you how to get started with Hibernate Validator, the reference implementation RI of Bean Validation. For the following quick-start you need: Project set up In order to use Hibernate Validator within a Maven project, simply add the following dependency to your pom. For instance you can add the following dependency to use the JSR reference implementation: However, the use of this interpolator is not Bean Validation specification compliant. If your application runs in an environment which does not provide this integration out of the box, you may use the Hibernate Validator CDI portable extension by adding the following Maven dependency to your POM: Running with a security manager Hibernate Validator supports running with a security manager being enabled. The following shows how to do this via a policy file as processed by the Java default policy implementation: Policy file for using Hibernate Validator with a security manager grant codeBase "file: ReflectPermission "suppressAccessChecks"; permission java. RuntimePermission "accessDeclaredMembers"; permission java. RuntimePermission "setContextClassLoader"; permission org. You can download the patch file from SourceForge or from Maven Central using the following dependency: Maven dependency for WildFly Running on Java 9 As of Hibernate Validator 6. These are the module names as declared using the Automatic-Module-Name header: This causes the method validation interceptor of Hibernate Validator to not be registered, i. If you need to enable the java. Class Car annotated with constraints package org. Validating constraints To perform a validation of these constraints, you use a Validator instance. Class CarTest showing validation examples package org. Test; import static org. A Validator instance is thread-safe and may be reused multiple times. It thus can safely be stored in a static field and be used in the test methods to validate the different Car instances. The validate method returns a set of ConstraintViolation instances, which you can iterate over in order to see which validation errors occurred. The first three test methods show some expected constraint violations: Note that only classes from the package javax. No classes from Hibernate Validator are directly referenced, resulting in portable code. Where to go next? That concludes the 5 minutes tour through the world of Hibernate Validator and Bean Validation. Continue exploring the code examples or look at further examples referenced in Chapter 14, Further reading. To learn more about the validation of beans and properties, just continue reading Chapter 2, Declaring and validating bean constraints. If you are interested in using Bean Validation for the validation of method pre- and postcondition refer to Chapter 3, Declaring and validating method constraints. In case your application has specific validation requirements have a look at Chapter 6, Creating custom constraints. Declaring and validating bean constraints In this chapter you will learn how to declare see Section 2. If you are interested in applying constraints to method parameters and return values, refer to Chapter 3, Declaring and validating method constraints. Declaring bean constraints Constraints in Bean Validation are expressed via Java annotations. In this section you will learn how to enhance an object model with these annotations. There are four types of bean constraints: In fact, none of the default constraints defined by Bean Validation can be placed at class level. Target annotation in the constraint annotation itself determines on which elements a constraint can be placed. See Chapter 6, Creating custom constraints for more information. Field-level constraints Constraints can be expressed by annotating a field of a class. Field-level constraints package org. This means the validation engine directly accesses the instance variable and does not invoke the property accessor method even if such an accessor exists. Constraints can be applied to fields of any access type public, private etc. Constraints on static fields are not supported, though. Property-level constraints If your model class adheres to the JavaBeans standard, it is also possible to annotate the properties of a bean class instead of its fields. Property-level constraints package org. That way also read-only properties can be constrained which have no setter method. When using property level constraints property access strategy is used to access the value to be validated, i. It is recommended to stick either to field or property annotations within one class. It is not recommended to annotate a field and the accompanying getter method as this would cause the field to be validated twice. Container element constraints It is possible to specify constraints directly on the type argument of a parameterized type: This requires that ElementType. As of Bean Validation 2. Hibernate Validator validates container element constraints specified on the following standard Java containers: Lists, Sets , implementations of java. Map, with support for keys and values, java. It also supports container element constraints on custom container types see Chapter 7, Value extraction. In versions prior to 6, a subset of container element constraints were supported. A Valid annotation was required at the container level to enable them. This is not required anymore as of Hibernate Validator 6. We present below a couple of examples illustrating container element constraints on various Java types. With Iterable When applying constraints on an Iterable type argument, Hibernate Validator will validate each element. Container element constraint on Set package org. With List When applying constraints on a List type argument, Hibernate Validator will validate each element. Container element constraint on List package org. With Map Container element constraints are also validated on map keys and values. Container element constraint on map keys and values package org. The key of the invalid element is included in the property path in the second example, the key is null. Optional When applying a constraint on the type argument of Optional, Hibernate Validator will automatically unwrap the type and validate the internal value. Container element constraint on Optional package org. With custom container types Container element constraints can also be used with custom containers. A ValueExtractor must be registered for the custom type allowing to retrieve the value s to validate see Chapter 7, Value extraction for more information about how to implement your own ValueExtractor and how to register it. Container element constraint on custom container type package org. Nested container elements Constraints are also supported on nested container elements. When validating a Car object as presented in Example 2. Constraints on nested container elements package org. Class-level constraints Last but not least, a constraint can also be placed on the class level. In this case not a single property is subject of the validation but the complete object. Class-level constraints are useful if the validation depends on a correlation between several properties of an object. The Car class in Example 2. For that purpose the ValidPassengerCount constraint is added on the class level. The validator of that constraint has access to the complete Car object, allowing to compare the numbers of seats and passengers. Refer to Section 6. Class-level constraint package org. Constraint inheritance When a class implements an interface or extends another class, all constraint annotations declared on the super-type apply in the same manner as the constraints specified on the class itself. Constraint inheritance package org. If an instance of RentalCar is validated, not only the NotNull constraint on rentalStation is evaluated, but also the constraint on manufacturer from the parent class.
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