API-first with Spring Boot 4 and OpenAPI Generator
How to apply the API-first approach with Spring Boot 4 and OpenAPI Generator.
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Project Leyden: speed up Spring Boot startup times with zero effort
Spring Boot startup 80% faster with zero code.
Read more: Project Leyden: speed up Spring Boot startup times with zero effort
Automatic MDC logs in Spring WebFlux with spring-webflux-mdc
Automatic Context Propagation with the spring-webflux-mdc library..
Read more: Automatic MDC logs in Spring WebFlux with spring-webflux-mdc
Webhook with Spring Boot
Implementing webhooks with Spring Boot: a practical guide with client and server example.
REST API Versioning: by URL vs. Content Negotiation
Example of versioning with OpenAPI and Spring Boot.
Read more: REST API Versioning: by URL vs. Content Negotiation
Partitioned Steps with Spring Batch
A complete guide to implementing parallel partitioned batch jobs with Spring Batch.
How to Use Spring Cloud AWS with LocalStack: Build and Test AWS Applications Locally
Learn how to integrate Spring Cloud AWS with LocalStack to emulate AWS services like SQS, DynamoDB, and Parameter Store, enabling fast and cost-effective local development and testing.
Read more: How to Use Spring Cloud AWS with LocalStack: Build and Test AWS Applications Locally
Broker agnostic with Spring Cloud Stream
Example of Kafka producer and consumer (also Reactive) with Spring Cloud Stream. Error handling with retry and DLQ.
Spring Boot vs Spring Boot with GraalVM: Performance testing and considerations
Migrating a classic Spring Boot app to a GraalVM native image. My experience.
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Virtual Threads vs WebFlux: who wins?
Let's challenge these two approaches with load tests!
OpenID Connect, OAuth2 and authorization code with Spring Cloud Gateway and WSO2 Identity Server
Centralized security with Spring, example of OAuth2 Client and Resource Server and session management with Hazelcast.
Securing your REST APIs with Spring Security and JWT
How to integrate JWT access token and refresh token with Spring Security.
Read more: Securing your REST APIs with Spring Security and JWT
Integration tests for DynamoDB with Spring Boot, Testcontainers, and Localstack
Testing DynamoDB with a LocalStack container shared between test classes.
Read more: Integration tests for DynamoDB with Spring Boot, Testcontainers, and Localstack
Retryable RestTemplate with RetryTemplate and centralized retry configuration
Centralized Retry configuration with Policy on HTTP statuses in response.
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Switching from Java 11 to Java 17
Which new features to exploit.
Web Service REST with Spring WebFlux and Reactive Mongo
WebFlux with functional (RouterFunction) and traditional (annotation based) endpoints.
Read more: Web Service REST with Spring WebFlux and Reactive Mongo
Kubernetes' Pod object
What is a Pod and how to create it.
Introduction to Kubernetes
What is Kubernetes and installing a Cluster via Kind.
Centralized management of multiple containers with Docker Compose
Docker Compose example for a Java app with Postgres database.
Read more: Centralized management of multiple containers with Docker Compose
Integration of WSO2 API Manager with WSO2 Identity Server
WSO2IS as Key Manager in WSO2AM.
Read more: Integration of WSO2 API Manager with WSO2 Identity Server
Communication between containers: networking in Docker
How to expose and isolate containers.
Read more: Communication between containers: networking in Docker
Persistence in Docker containers: volumes and bind mounts
How to make the filesystem of a Docker container persistent.
Read more: Persistence in Docker containers: volumes and bind mounts
Build and export custom images: docker commit, docker build and docker save
Example of Dockerfile to create a Docker image of a Java app.
Read more: Build and export custom images: docker commit, docker build and docker save
Get Started with Docker
What are containers and basic operations with Docker.
Introduction to Spring and Dependency Injection
How to declare a bean, types and DI considerations.
Singleton Pattern
Singleton Pattern, how to make it Thread-safe, how to handle possible subclasses.
JPA Fetch and N+1 SELECT problem
LAZY Fetch vs EAGER Fetch and possible optimizations.
EntityManager: Application managed and Container managed
Persistence Context, Persistence Unit, EntityManager from container and from application.
Read more: EntityManager: Application managed and Container managed
Introduction to JPA and relationship mapping
OneToMany, OneToOne and ManyToMany in JPA.
Level 3 REST services and paging with Spring HATEOAS
Let's see how to implement a level 3 Restful Web Service of the Richardson Maturity Model.
Read more: Level 3 REST services and paging with Spring HATEOAS
Richardson Maturity Model and REST levels
What is the Richardson Maturity Model and HATEOAS.
Spring Monitoring with Spring Actuator and Spring Boot Admin
Let's see how to monitor a Spring Boot app in a simple way.
Read more: Spring Monitoring with Spring Actuator and Spring Boot Admin
Integration Test with TDD, Spring Boot, JUnit 5 and H2
Example of integration test with Spring Boot, JUnit 5 and H2 as in-memory database.
Read more: Integration Test with TDD, Spring Boot, JUnit 5 and H2
TDD and Unit Test with JUnit 5 and Mockito
Example of unit test with JUnit 5 and Mockito using test drive development.
Manage multiple instances of Spring Batch with Shedlock
How to manage easily a Spring Batch app on several nodes with the Shedlock library.
Read more: Manage multiple instances of Spring Batch with Shedlock
Lesson 3: The selection (if-else)
The selection (if-else).
Lesson 2: First program in Java
A first simple (procedural) program in Java.
Lesson 1: Introduction to Java and tools used
Introduction of Java language.
Lesson 0: Introduction to programming
A brief Intro on what programming is.
REST Web Service + CRUD in 5 minutes with Spring Boot and Spring Data REST
An easy and fast way for develop an entry level backend.
Read more: REST Web Service + CRUD in 5 minutes with Spring Boot and Spring Data REST