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Spring Boot + PostgreSQL – Integration Testing with Testcontainers

Integration testing is critical for ensuring that your application interacts correctly with external systems. In this project, we demonstrate how to perform integration testing in a Spring Boot application using PostgreSQL as the database and Testcontainers to run a real PostgreSQL instance during tests. This approach helps create a production-like, isolated, and repeatable testing environment. […]

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GraphQL + Spring Boot example

GraphQL is a query language for APIs that was developed by Facebook in 2012 and open-sourced in 2015. It provides a powerful, flexible alternative to REST by allowing clients to request exactly the data they need in a single request, thereby reducing over-fetching and under-fetching issues. While GraphQL offers great advantages such as efficient data

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Kafka Example Messaging with Spring Boot

In our previous articles About RabbitMQ and RabbitMQ Example, we explored what RabbitMQ is and how it works. Now, let’s dive into Apache Kafka and put that knowledge into practice by implementing messaging in Spring Boot. In this article, we’ll create two projects—a producer and a consumer—using Spring Initializr. Both projects will share a similar dependency

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RabbitMQ Example Messaging with Spring Boot

In our previous article How RabbitMQ Works: Standard Message Flow and Routing Types, we explored what RabbitMQ is and how it works. Now, let’s put that knowledge into practice by implementing messaging in Spring Boot. We will create two projects—one for sending messages (the producer) and one for receiving them (the consumer). 1. What We Are

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How RabbitMQ Works: Standard Message Flow and Routing Types

In this article, we explore how RabbitMQ, the popular message broker, works to facilitate communication between different components of a system. We will break down the standard message flow in RabbitMQ and explain the different types of routing available, providing a clear understanding of how messages are published, routed, and consumed. Standard RabbitMQ Message Flow

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Spring Boot + DataMongoTest + Testcontainers: Testing MongoDB Repositories with a MongoDB Container

Introduction The @DataMongoTest annotation in Spring Boot is designed for isolated testing of MongoDB repositories. By default, it configures an embedded MongoDB (Flapdoodle) for testing. However, in real-world scenarios, we might need to test against a real MongoDB instance without installing it locally. This is where Testcontainers comes in. What is Testcontainers? Testcontainers is a

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Spring Boot + DataMongoTest: Testing MongoDB Repositories with Embedded MongoDB (Flapdoodle)

Introduction The @DataMongoTest annotation in Spring Boot is designed for isolated testing of MongoDB repositories. It automatically configures an embedded MongoDB instance using Flapdoodle, which eliminates the need for a real database. By default, @DataMongoTest: Automatically configures an in-memory MongoDB instance (Flapdoodle). Loads only MongoDB-related components (documents, repositories, etc.). Rolls back changes after each test,

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Spring Boot + DataMongoTest: Testing MongoDB Repositories with a Real Database

Introduction The @DataMongoTest annotation in Spring Boot is specifically designed for isolated testing of MongoDB repositories. It loads only MongoDB-related components, ensuring fast and efficient tests. By default, @DataMongoTest: Automatically configures an embedded MongoDB instance (Flapdoodle). Rolls back changes after each test, keeping the database clean. Excludes unnecessary beans (@Service, @Controller), making tests lightweight. However,

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Spring Boot + DataJpaTest + Testcontainers: Testing JPA Repositories

Introduction The @DataJpaTest annotation in Spring Boot is commonly used for testing JPA repositories in isolation. By default, it sets up an in-memory H2 database, but what if we want to test with a real database such as PostgreSQL without installing it locally? This is where Testcontainers comes in. What is Testcontainers? Testcontainers is a

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Spring Boot + DataJpaTest: Testing JPA Repositories with H2 Database

Introduction The @DataJpaTest annotation in Spring Boot is specifically designed for isolated testing of JPA repositories. Instead of bootstrapping the entire Spring Boot application, it loads only JPA-related components such as: ✅ @Entity classes✅ Spring Data JPA repositories✅ Database configuration What Happens When Using @DataJpaTest? By default, @DataJpaTest: Automatically configures an in-memory database (H2, HSQLDB,

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