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Validating constraints for JavaBeans in Java microservices

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Duration

20 Minutes

level

Intermediate

Rating

4.4

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9 Reviews

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50 Enrolled

Discover how to validate constraints for JavaBeans in Java microservices. Learn how to use annotations and the Java Bean Validation API to ensure the correctness of data and maintain consistency within microservices.

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At a Glance

Explore the use of bean validation to validate user input data for microservices.

You will learn the basics of writing and testing a microservice that uses bean validation and the new functionality of Bean Validation 2.0. The service uses bean validation to validate that the supplied JavaBeans meet the defined constraints.
Bean Validation is a Java specification that simplifies data validation and error checking. Bean validation uses a standard way to validate data stored in JavaBeans. Validation can be performed manually or with integration with other specifications and frameworks, such as Contexts and Dependency Injection (CDI), Java Persistence API (JPA), or JavaServer Faces (JSF). To set rules on data, apply constraints by using annotations or XML configuration files. Bean validation provides both built-in constraints and the ability to create custom constraints. Bean validation allows for validation of both JavaBean fields and methods. For method-level validation, both the input parameters and return value can be validated.
Several additional built-in constraints are included in Bean Validation 2.0, which reduces the need for custom validation in common validation scenarios. Some of the new built-in constraints include @Email, @NotBlank, @Positive, and @Negative. Also in Bean Validation 2.0, you can now specify constraints on type parameters.
The example microservice uses both field-level and method-level validation as well as several of the built-in constraints and a custom constraint.

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Validating constraints for JavaBeans in Java microservices
Validating constraints for JavaBeans in Java microservices
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