Spring Boot 2.0 Projects Build production-grade reactive applications and microservices with Spring Boot (English Edition) (Mohamed Shazin Sadakath)（Z-Library）

【One-Line Pitch】 A hands-on project guide that walks Java developers through Spring Boot 2.0 by building real applications—from a basic web app to a reactive movie-rating API—while flagging the migration traps that come with the 2.0 release. Best for developers who already know some Spring and want to learn by shipping working code. 【Book Arc】 - **Opening (~0%–10%)**: Bootstraps the reader into Spring Boot 2.0—project anatomy, the `@SpringBootApplication` entry point, and the multiple ways to run an app (IDE, fat JAR/WAR, Maven plugin). - **Early (~10%–32%)**: Covers the 2.0 upgrade surface—the new configuration-property binding API, YAML vs. properties, Micrometer-based custom metrics, and the Actuator renames/relocations that break 1.x code—then moves into a basic web application with JPA, H2, auditing, and Thymeleaf views. - **Middle (~32%–48%)**: Builds a blog management system using Elasticsearch as the data store, applying the MVC pattern and FreeMarker templates, with Spring Security wiring authentication and `AuditorAware` for `@CreatedBy` auditing. - **Late (~48%–75%)**: Shifts to reactive territory—Spring WebFlux controllers, Spring Data MongoDB persistence, and a RESTful movie-rating API written in Kotlin, secured with basic authorization and verified through integration tests and Postman. - **Ending (~75%–100%)**: The excerpts do not cover the closing chapters in detail; the table of contents points to further reactive/microservice material beyond the movie API. 【Key Takeaways】 - **Spring Boot 2.0 is a migration-heavy release** (Early): Actuator properties moved under `management.*`, endpoints were renamed (`/autoconfig`→`/conditions`, `/trace`→`/httptrace`), and CRaSH remote shell, Spring Mobile, and Spring Social auto-configuration were removed—so 1.x code needs deliberate rework. - **Configuration binding got a new API** (Early): YAML and properties files both work, but the 2.0 binding API changes how POJOs like `Address` map to nested config, which matters for anyone upgrading. - **Observability is first-class via Micrometer** (Early): Custom metrics (e.g., a `custom.endpoint.calls` counter) are registered through `MeterRegistry`, making production monitoring a design concern rather than an afterthought. - **Layered MVC keeps projects maintainable** (Middle): Separating presentation, routing/business logic, and persistence lets UI and database work proceed independently—contrasted explicitly with unlayered "spaghetti" web apps. - **Template engines beat raw JSP for views** (Early): Thymeleaf and FreeMarker decouple presentation from business logic and enable reuse of tested markup, reducing duplication and bugs. - **Security and auditing are wired together** (Middle): `AuditorAware` pulls the logged-in principal from `SecurityContextHolder` so `@CreatedBy` fields populate automatically—a pattern worth copying. - **Reactive REST is the book's advanced payoff** (Late): A Kotlin + WebFlux + MongoDB movie-rating API demonstrates the reactive stack end-to-end, including service/controller testing and Postman-based verification. - **Testing is treated as part of each build** (Early–Late): Repository tests, mocked service tests, and integration tests appear alongside features rather than as a separate topic. 【Reading Tips】 - **Skim the migration chapter if you're new to Spring Boot**, but deep-read it if you're upgrading a 1.x codebase—the Actuator and property changes are the highest-risk items. - **Follow the projects in order**: each builds on prior setup (JPA/H2 → Elasticsearch → MongoDB/WebFlux), so skipping ahead means re-creating infrastructure. - **Treat the reactive chapters as the hard part**: WebFlux, Kotlin, and MongoDB together are the steepest climb; budget extra time and run the integration tests yourself. - **Use the code repositories referenced in the excerpts** rather than retyping snippets—the book points to per-chapter GitHub directories. - **Take away the patterns, not just the code**: auditing via `AuditorAware`, layered MVC, and Micrometer metrics transfer to your own projects. 【Coverage Limits】 This guide is based on stratified excerpts covering roughly the first half of the book (through the reactive movie API); later chapters and any microservices material are not represented, so claims about the ending are inferred from the table of contents only.