Spring Boot 3.0 Cookbook: Proven recipes for building modern and robust Java web applications with Spring Boot

Spring Boot 3.0 Cookbook....2 Contributors....5 About the author....5 About the reviewers....5 Preface....29 Who this book is for....30 What this book covers....31 To get the most out of this book....32 Download the example code files....33 Conventions used....33 Sections....34 Getting ready....34 How to do it…....34 How it works…....35 There’s more…....35 See also....35 Get in touch....35 Share Your Thoughts....35 Download a free PDF copy of this book....35 Part 1:Web Applications and Microservices....37 Chapter 1: Building RESTful APIs....38 Technical requirements....38 Creating a RESTful API....39 Getting ready....39 How to do it.......39 How it works.......42 There’s more.......43 See also....44 Defining responses and the data model exposed by the API....44 Getting ready....44 How to do it.......44 How it works.......47 Managing errors in a RESTful API....48 Getting ready....48 How to do it.......49 How it works.......50 There’s more.......50 Testing a RESTful API....50 Getting ready....51 How to do it.......51 How it works.......53 There’s more.......53 See also....53 Using OpenAPI to document our RESTful API....54 Getting ready....54 How to do it.......54 How it works.......56 Consuming a RESTful API from another Spring Boot application using FeignClient....56 Getting ready....56 How to do it.......56 How it works.......58 There’s more.......59 Consuming a RESTful API from another Spring Boot application using RestClient....59 Getting ready....59 How to do it.......59 How it works.......60 Mocking a RESTful API....61 Getting ready....62 How to do it.......62 How it works.......63 See also....64 Chapter 2: Securing Spring Boot Applications with OAuth2....65 Technical requirements....65 Setting up Spring Authorization Server....66 Getting ready....66 How to do it…....66 How it works…....69 There’s more…....70 See also....70 Protecting a RESTful API using OAuth2....71 Getting ready....71 How to do it…....72 How it works…....74 Protecting a RESTful API using OAuth2 with different scopes....75 Getting ready....76 How to do it…....76 How it works…....78 There’s more…....78 See also....79 Configuring an MVC application with OpenID authentication....79 Getting ready....80 How to do it…....80 How it works…....89 See also....89 Logging in with Google Accounts....90 Getting ready....90 How to do it…....90 How it works…....101 See also....102 Integrating a RESTful API with a cloud IdP....103 Getting ready....103 How to do it…....103 How it works…....112 There’s more…....113 Chapter 3: Observability, Monitoring, and Application Management....117 Technical requirements....118 Adding Actuator to your application....118 Getting ready....119 How to do it…....119 How it works…....120 There’s more…....120 See also....120 Creating a custom Actuator endpoint....121 Getting ready....121 How to do it…....121 How it works…....124 Using probes and creating a custom health check....125 Getting ready....125 How to do it…....126 How it works…....129 See also....130 Implementing distributed tracing....130 Getting ready....131 How to do it…....131 How it works…....136 There’s more…....137 Accessing standard metrics....139 Getting ready....139 How to do it…....140 How it works…....142 See also....143 Creating your own metrics....143 Getting ready....144 How to do it…....144 How it works…....146 There’s more…....146 Integrating your application with Prometheus and Grafana....148 Getting ready....148 How to do it…....149 How it works…....156 Changing the settings of a running application....157 Getting ready....157 How to do it…....158 How it works…....160 There’s more…....160 Chapter 4: Spring Cloud....161 Technical requirements....161 Setting up Eureka Server....162 Getting ready....162 How to do it.......162 How it works.......164 Integrating an application in Eureka Server....164 Getting ready....164 How to do it.......164 How it works.......167 There’s more.......168 Scaling out the RESTful API....168 Getting ready....169 How to do it.......169 How it works.......171 Setting up Spring Cloud Gateway....171 Getting ready....173 How to do it.......173 How it works.......174 See also....175 Testing Spring Cloud Gateway....175 Getting ready....176 How to do it.......176 How it works.......178 Setting up Spring Cloud Config....178 Getting ready....179 How to do it.......179 How it works.......181 There’s more.......183 See also....183 Integrating distributed tracing with Spring Cloud....184 Getting ready....184 How to do it.......184 How it works.......187 Deploying Spring Boot Admin....187 Getting ready....188 How to do it.......188 How it works.......192 Protecting Spring Cloud Gateway....193 Getting ready....193 How to do it.......193 How it works.......196 Part 2: Database Technologies....197 Chapter 5: Data Persistence and Relational Database Integration with Spring Data....198 Technical requirements....199 Connecting your application to PostgreSQL....199 Getting ready....199 How to do it.......200 How it works.......202 There’s more.......202 Using JdbcClient to access the database....203 Getting ready....203 How to do it.......203 How it works.......204 Using an ORM to access the database....204 Getting ready....205 How to do it.......205 How it works.......208 There’s more.......209 See also....210 Creating the database schema from our code....210 Getting ready....210 How to do it.......210 How it works.......212 There’s more.......213 See also....213 PostgreSQL integration tests with Testcontainers....213 Getting ready....214 How to do it.......214 How it works.......215 Versioning and upgrading database schema....216 Getting ready....216 How to do it.......216 How it works.......219 There’s more.......220 See also....220 Using JPQL....221 Getting ready....221 How to do it.......221 How it works.......225 There’s more.......225 Using Native Queries....226 Getting ready....226 How to do it.......226 How it works.......228 There’s more.......229 See also....229 Updating Operations....230 Getting ready....230 How to do it.......230 How it works.......234 See also....235 Using Dynamic Queries....235 Getting ready....236 How to do it.......236 How it works.......238 There’s more.......238 See also....238 Using Transactions....239 Getting ready....239 How to do it.......239 How it works.......241 There’s more.......243 See also....243 Chapter 6: Data Persistence and NoSQL Database Integration with Spring Data....245 Technical requirements....246 Connecting your application to MongoDB....246 Getting ready....246 How to do it.......247 How it works.......250 There’s more.......251 Using Testcontainers with MongoDB....251 Getting ready....251 How to do it.......252 How it works.......253 Data indexing and sharding in MongoDB....253 Getting ready....254 How to do it.......254 How it works.......256 There’s more.......258 Using transactions in MongoDB....258 Getting ready....259 How to do it.......259 How it works.......261 See also....262 Deploying a MongoDB cluster in Testcontainers....262 Getting ready....262 How to do it.......262 How it works.......264 Managing concurrency with MongoDB....265 Getting ready....266 How to do it.......266 How it works.......267 Connecting your application to Apache Cassandra....268 Getting ready....268 How to do it.......268 How it works.......270 See also....271 Using Testcontainers with Cassandra....271 Getting ready....271 How to do it.......272 How it works.......273 Using Apache Cassandra templates....273 Getting ready....274 How to do it.......274 How it works.......275 There’s more.......276 Managing concurrency with Apache Cassandra....276 Getting ready....277 How to do it.......277 How it works.......278 Part 3: Application Optimization....279 Chapter 7: Finding Bottlenecks and Optimizing Your Application....280 Technical requirements....280 Tuning the database connection pool....281 Getting ready....281 How to do it…....282 How it works…....286 There’s more…....287 Caching dependencies....287 Getting ready....288 How to do it…....288 How it works…....290 There’s more…....290 Using shared cache....292 Getting ready....292 How to do it…....293 How it works…....294 Using Testcontainers with Redis cache....295 Getting ready....295 How to do it…....296 How it works…....296 Creating a native image using Spring Boot....297 Getting ready....297 How to do it…....297 How it works…....298 Using GraalVM Tracing Agent to configure the native application....299 Getting ready....299 How to do it…....300 How it works…....301 There’s more…....302 Creating a native executable using Spring Boot....303 Getting ready....303 How to do it…....304 How it works…....304 There’s more…....304 Creating a native executable from a JAR....305 Getting ready....306 How to do it…....306 How it works…....307 Chapter 8: Spring Reactive and Spring Cloud Stream....308 Technical requirements....309 Creating a reactive RESTful API....309 Getting ready....310 How to do it.......310 How it works.......311 There’s more.......312 Using a reactive API client....313 Getting ready....313 How to do it.......313 How it works.......315 Testing reactive applications....315 Getting ready....315 How to do it.......316 How it works.......318 Connecting to PostgreSQL using Spring Data R2DBC....319 Getting ready....319 How to do it.......320 How it works.......322 There’s more.......323 Event-driven applications with Spring Cloud Stream and RabbitMQ....324 Getting ready....324 How to do it.......325 How it works.......327 There’s more.......329 See also....330 Routing messages with Spring Cloud Stream and RabbitMQ....330 Getting ready....330 How to do it.......331 How it works.......332 See also....334 Error handling with Spring Cloud Stream....334 Getting ready....335 How to do it.......335 How it works.......338 See also....339 Part 4: Upgrading to Spring Boot 3 from Previous Versions....340 Chapter 9: Upgrading from Spring Boot 2.x to Spring Boot 3.0....341 Technical requirements....341 Preparing the application....342 Getting ready....342 How to do it.......343 How it works.......344 See also....345 Preparing Spring Security....345 Getting ready....345 How to do it.......345 How it works.......347 See also....347 Detecting property changes....348 Getting ready....348 How to do it.......348 How it works.......350 Upgrade the project to Spring Boot 3....350 Getting ready....350 How to do it.......351 How it works.......352 Upgrading Spring Data....353 Getting ready....353 How to do it.......353 How it works.......356 There’s more.......357 See also....357 Managing Actuator changes....357 Getting ready....357 How to do it.......358 How it works.......360 See also....361 Managing web application changes....361 Getting ready....362 How to do it.......362 How it works.......362 There’s more.......362 See also....363 Using OpenRewrite for migration automation....363 Getting ready....363 How to do it.......363 How it works.......367 There’s more.......367 See also....368 Index....369 Why 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