Hands-On Code Examples for Tutorials on rieckpil.de

If you find an issue or bug within the provided code examples, feel free to open an issue, and we'll take a look.

Cheat Sheets

• Testing Java Applications Cheat Sheet
• Java EE & Jakarta EE Application Server Cheat Sheet (Sources)
• Spring Web MVC Cheat Sheet (Sources)

Articles about Testing

• Parallelizing Only Java Unit Tests with JUnit 5 and Maven (Sources)
• Test Thymeleaf Controller Endpoints with Spring Boot and MockMvc (Sources)
• Spring Boot Testing: MockMvc vs. WebTestClient vs. TestRestTemplate (Sources)
• Amazon SQS Listener Testing with @SqsTest (Spring Cloud AWS) (Sources)
• Spring Boot Test Spring Web MVC HandlerInterceptor (Sources)
• LaunchDarkly Java Testing and Local Development Hints (Sources)
• What the Heck Is the SpringExtension Used For? (Sources)
• Maven Setup For Testing Java Applications (Sources)
• Creating Deep Stubs With Mockito to Chain Method Stubbing (Sources)
• Spring Boot Unit and Integration Testing Overview (Sources)
• Initialization Strategies With Testcontainers For Integration Tests (Sources)
• Record Spring Events When Testing Spring Boot Applications (Sources)
• Testing Spring Boot Applications With REST Assured (Sources)
• How to Test Java HTTP Client Usages (e.g OkHttp, Apache HttpClient) (Sources)
• Spring Boot Test Slices Overview and Usage (Sources)
• Guide to Testing Spring Boot applications with MockMvc (Sources)
• MongoDB Testcontainers Setup for @DataMongoTest (Sources)
• Mocking Statics Methods with Mockito (Kotlin & Java) (Sources)
• Mock Java Constructors And Their Object Creation With Mockito (Sources)
• Write Concise Web Tests With Selenide for Java Projects (Sources)
• Test Your Spring MVC Controller with the WebTestClient and MockMvc (Sources)
• Test Your Spring Boot JPA Persistence Layer With @DataJpaTest (Sources)
• Override Spring Boot Configuration Properties For Tests (Sources)
• Use GreenMail For Spring Mail (JavaMailSender) JUnit 5 Integration Tests (Sources)
• Write Spring Boot integration tests with Testcontainers (JUnit 4 and 5) (Sources)
• Reuse containers with Testcontainers for fast integration tests (Sources)
• Test Spring WebClient with MockWebServer from OkHttp (Sources)
• Test Spring applications using AWS with Testcontainers and LocalStack (Sources)
• Write integration tests for your Spring WebSocket endpoints (Sources)
• Improve build times with Context Caching from Spring Test (Sources)
• Testing Spring Boot Applications with Kotlin and Testcontainers (Sources)
• Write JPA integration tests with Java EE (Sources)
• Simple load-testing with Apache Benchmark (Sources)
• Java Benchmarking with JMH (Java Microbenchmark Harness) (Sources)
• Consumer-Driven Contracts with Spring Cloud Contract (Sources)
• Jakarta EE integration tests with MicroShed Testing (Sources)
• Spring Boot Integration Tests with WireMock and JUnit 5 (Sources)
• Spring WebTestClient for efficient testing of your REST API (Sources)
• Spring Boot Functional Tests with Selenium and Testcontainers (Sources)
• Testing your Spring RestTemplate with @RestClientTest (Sources)
• Five JUnit 5 features you might not know yet (Sources)
• Testing your JSON serialization with @JsonTest (Sources)

Articles about Spring Boot

• Lock @Scheduled Tasks With ShedLock And Spring Boot (Sources)
• Best Practices Flyway and Hibernate with Spring Boot (Sources)
• Up- and download files with React and Spring Boot (Sources)
• Expose git information with Spring Boot’s Actuator (Sources)
• Lazy Loading of JPA attributes with Hibernate (Sources)
• Send E-Mails with SendGrid and Spring Boot (Sources)
• Dynamic SQL Querying & Pagination with Querydsl and Spring Data JPA (Sources)
• Remote Debug Spring Boot applications (IntelliJ IDEA + Eclipse) (Sources)
• Use Spring’s WebClient for RESTful communication (Sources)
• Generate random data in Java using Java Faker (Sources)
• Feature Toggles for Spring Boot applications with Togglz (Sources)
• Spring WebClient OAuth2 Integration for Spring WebFlux (Sources)
• Spring WebClient OAuth2 Integration for Spring Web (Servlet) (Sources)
• Expose Metrics of Spring WebClient using Spring Boot Actuator (Sources)
• Spring WebClient exchange vs. retireve a comparison (Sources)
• Customize Spring WebClient with WebClientCustomizer (Sources)

Articles about AWS

• AWS Lambda with Kotlin and Spring Cloud Function (Sources)
• OIDC Logout With AWS Cognito and Spring Security (Sources)
• Java AWS Lambda Container Image Support (Complete Guide) (Sources)
• Resolving Spring Boot properties using the AWS Parameter Store (SSM) (Sources)
• Java AWS Lambda with Serverless and Maven - Thumbnail Generator (Sources)
• Java AWS Lambda with Spring Cloud Function (Sources)
• Thymeleaf OAuth2 Login with Spring Security and AWS Cognito (Sources)

Articles about Azure

• Using Azurite to Test Azure Blob Storage Interactions in Spring Boot (Sources)

Articles about Kotlin

• Create Spring Boot applications with Maven and Kotlin (Sources)
• Write Java EE applications with Kotlin (Sources)
• Writing JavaScript code with Kotlin using Gradle (Sources)

Articles about Java EE/Jakarta EE/MicroProfile

• Avoid repeating attributes in JPA entities (Sources)
• Deploy a Spring Boot Uber-Jar application within Open Liberty (Sources)
• Simple CRUD table with JSF and PrimeFaces (Sources)
• Simple JSF 2.3 Login with Java EE 8 Security API (Sources)
• Simple JMS application with the embedded messaging engine in Open Liberty (Sources)
• JAX-RS user-based API rate-limiting with JSR-375 (Sources)
• Generate documents from Word templates with Docx4j on Wildfly 14 (Sources)
• MicroProfile JWT Authentication with Keycloak and React (Sources)
• Generate PDFs (Apache PDFBox) including Charts (XChart) with Java EE (Sources)
• Up- and downloading files with Java EE and Web Components (Sources)
• RESTEasy (WildFly) file up- and downloading (Sources)
• Messaging with JMS using Payara with embedded OpenMQ broker (Sources)
• Nice-looking JSF 2.3 apps with PrimeFaces 7.0 (Sources)
• Send emails with Java EE using Payara (Sources)
• Deploy Java EE applications to Kubernetes (Sources)
• MicroProfile Rest Client for RESTful communication (Sources)
• Intercept method calls using CDI interceptors (Sources)
• Bootstrap your first Jakarta EE 8 application (Sources)
• Jakarta EE and MicroProfile applications with React and PostgreSQL (Sources)
• Create real-time applications with Jakarta EE WebSocket (Sources)
• Jakarta EE & React file up- and download using Java 11 and TypeScript (Sources)

Miscellaneous

• Automatic Java Code Migration with OpenRewrite (Mockito Example) (Sources)
• Simple database documentation with SchemaSpy (Sources)
• Preview PDF files with React (Sources)
• Writing PostgreSQL functions with Java using PL/Java (Sources)
• Deploy a React application to Kuberntes (Sources)
• Create your own Maven Archetype in 5 simple steps (Sources)
• GitHub Actions for Java - automate your Maven workflows (Sources)

WHATIS? Articles

• JavaServer Faces. An introduction to JSF 2.3 (Sources)
• GraalVM - an introduction to the next level JVM (Sources)
• MicroProfile Config (Sources)
• MicroProfile Fault Tolerance (Sources)
• MicroProfile Metrics (Sources)
• MicroProfile JWT Auth (Sources)
• MicroProfile Rest Client (Sources)
• MicroProfile OpenAPI (Sources)
• MicroProfile OpenTracing (Sources)
• MicroProfile Health (Sources)
• Contexts and Dependency Injection (CDI) (Sources)
• Jakarta RESTful Web Services (JAX-RS) (Sources)
• JSON Binding (JSON-B) (Sources)
• JSON Processing (JSON-P) (Sources)

REVIEW Articles

• What’s new in Spring Boot 2.1 (Sources)
• What's new in Spring Boot 2.2 (Sources)
• What's new in Spring Boot 2.3 (Sources)
• What's new in MicroProfile 3.1 (Sources)
• Improved Java/Jakarta EE productivity with Adam Bien’s WAD (Watch and Deploy) (Sources)
• 5 Java 9 Features you might not know yet (Sources)
• Top 3 Maven Plugins to ensure Quality and Security for your project (Sources)
• Joyful Open Liberty Developer Experience with Liberty Maven Plugin (Sources)