Java – Page 2 – Devblueprint.tech

Spring Boot + DataJpaTest: Testing JPA Repositories with a Real Database

Introduction The @DataJpaTest annotation in Spring Boot is specifically designed for testing JPA repositories in an isolated manner. Instead of bootstrapping the entire application context, it initializes only the components relevant to JPA, such as entities, repositories, and the database configuration. By default, @DataJpaTest: Scans for @Entity classes and configures Spring Data JPA repositories. Automatically […]

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Spring Boot + WebMvcTest: Testing REST Controllers

Introduction @WebMvcTest is a specialized test annotation in Spring Boot used to test REST controllers in isolation. It initializes only the Spring MVC components required for testing controllers, without loading the full application context. This makes tests faster and more focused on the web layer. In this guide, we will cover how to test a

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Spring Boot + WireMock example testing REST Clients

Introduction Writing reliable tests for REST clients is crucial in modern application development. But testing external API calls can be tricky – we don’t want to depend on real services. WireMock helps us mock API responses efficiently. In this article, we’ll explore how to use WireMock in a Spring Boot project to test API calls

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Spring Boot + Mockito example unit testing

Introduction Are you still afraid of writing tests? Do you think it’s complicated and time-consuming? Relax! It’s much easier than it seems. With Mockito, we can easily create isolated tests that help us verify service operations without touching the real database. In this article, we’ll explore how to properly use @Mock and @InjectMocks to make

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Spring Boot + Liquibase

Introduction Liquibase is a powerful tool for managing database schema changes. It allows for automatic application, rollback, and tracking of database structure changes in Spring Boot projects. An alternative tool is Flyway, which is also widely used for database migrations. The key differences between them are: Liquibase supports migrations in XML, YAML, JSON, and SQL

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Spring Boot + Flyway

What are we going to build? In this tutorial, we will set up a Spring Boot application that integrates with Flyway for seamless database migrations. We’ll use PostgreSQL as our database, running in a Docker container. The API will expose device data stored in the database. What is Flyway? Flyway is a database migration tool

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Quarkus REST API

Building a Mock Device Server with Quarkus Introduction What are we going to build? In this tutorial, we will create a mock device server using Quarkus. This server will expose a REST API that generates and returns mock device data based on a request parameter. What will our API do? GET /devices?amount=5 →

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