SpringBoot integration tests load the full application context to verify end‑to‑end behavior, while unit tests only cover isolated methods; this guide explains @SpringBootTest fundamentals, configuration options, MockMvc usage, test structure, common pitfalls, and best practices for reliable full‑stack testing.
The article outlines ten essential Spring Boot plugins—Actuator, Micrometer + Prometheus, OpenTelemetry, Spring Cloud Gateway, Resilience4j, Spring Security, Flyway/Liquibase, Testcontainers, Spring Native/AOT, and structured logging—explaining why each is required for secure, observable, cloud‑native, and cost‑efficient production systems in 2026.
This article introduces a free Spring Boot 3 ebook collection of 164 practical cases and shares ten powerful techniques—including custom @Conditional logic, lazy initialization, structured configuration binding, custom starters, Testcontainers testing, event‑driven programming, hidden Actuator endpoints, fine‑grained startup control, Tomcat performance tuning, and monitoring—to help developers build leaner, faster, and more maintainable backend services.
This guide walks through Spring Framework 6.1's new JdbcClient API, showing how to define a Bookmark entity, create the corresponding MySQL schema, perform fluent CRUD operations, and verify them with Testcontainers‑based integration tests in a Spring Boot 3.2 project.
Spring Boot 3.1.0 introduces a host of enhancements—including automatic configuration for Spring Authorization Server, upgraded HttpClient support, refined Testcontainers integration, new Docker‑Compose capabilities, and updates to Hibernate, Jackson, Mockito, and SSL handling—while also providing detailed Maven and Gradle options for image building.
This comprehensive guide explains how to design and implement functional tests for a Spring Boot microservice using Docker containers, REST‑Assured, WireMock, and Testcontainers, covering architecture, code examples, test configuration, and best practices for maintainable black‑box testing.
