How to get productive with Spring Boot

Transcript

1. How to get productive with Spring Boot Madhura Bhave
2. Agenda • Getting Started • Dependency Management / Starters / start.spring.io • Development-time • Devtools / Auto-configuration report / Configuration Properties / Testing • Production • Actuator endpoints
3. Getting Started CODE
4. Parent POM <parent> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-parent</artifactId> <version>2.1.9.RELEASE</version> </parent>
5. Parent POM Dependency Management Java Level 1.8 Sensible Plugins Resource Filtering
6. Demo Parent POM
7. Custom Parent POM <dependencyManagement> <dependencies> <dependency> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-dependencies</artifactId> <version>2.1.9.RELEASE</version> <type>pom</type> <scope>import</scope> </dependency> </dependencies> </dependencyManagement>
8. Gradle Dependency management plugins { id 'org.springframework.boot' version ‘2.1.9.RELEASE' } apply plugin: 'io.spring.dependency-management'
9. Demo Starters
10. Starters • One-stop shop for a set of dependencies • No copy/paste for common use-cases • Starters are managed dependencies • Community starters
11. start.spring.io Spring Initializr
12. Development Time Getting productive during development
13. Demo Back to the code
14. Devtools • Automatic Restarts • Condition evaluation delta • Sensible property defaults • Live reload for static resources
15. Demo Troubleshoot auto-configuration
16. Troubleshooting auto-Configuration
17. Troubleshooting auto-Configuration • Condition Evaluation Report with --DEBUG • Conditions Endpoint • Use the source • *AutoConfiguration • @Conditional*
18. Demo Configuration properties
19. Configuration properties • @Value(${“property”}) are tedious • JSR-303 Validation • Auto-completion • /configprops endpoint • Now also immutable
20. Demo Testing
21. Testing ApplicationContext
22. Testing ApplicationContext
23. Testing ApplicationContext ApplicationContext
24. Testing ApplicationContext ApplicationContext
25. Testing ApplicationContext @WebFluxTest @WebMvcTest @DataMongoTest @DataJpaTest
26. Testing • Junit 5 • Testcontainers
27. Testing Spring Boot Applications https://springoneplatform.io/2019/sessions/ testing-spring-boot-applications
28. Production
29. • Why is the app down? • Why does the app work locally but not in production? • What version of the app is running in production?
30. Actuator Endpoints • Health • Info • Environment • Runtime configuration of Loggers • JVM Thread dump
31. Health Endpoint • Aggregates health indicators • Custom health indicators can be added • Usage: • Authenticated / Unauthenticated • Health Groups
32. Info Endpoint • Git Information • Branch / Commit ID / Commit time • Build Information • Artifact / Group / Version • Custom Info contributorS
33. Env Endpoint • Access to the Spring Environment • Shows • Active profiles • property sources in the order of precedence
34. Loggers Endpoint • access to application’s loggers • Update logger configuration at runtime
35. Thread Dump Endpoint • provides a thread dump from the application’s JVM • Accepts Text/plain requests • compatible with • https://fastthread.io • https://github.com/irockel/tda
36. Demo Actuator endpoints
37. Getting productive with Spring Boot Yay @madhurabhave23 mbhave@pivotal.io