Outline

Java Fundamentals

• Java 21, 25 (LTS)
• OOPs concepts
• Exception Handling
• Collections and Map
• Streams
• Lambda
• Multithreading and concurrency
• Records, Sealed, Pattern mactching
• Virtual Threads

Build Tools

• Maven
• Gradle

Spring Core

• Inversion of Controls (IoC)
• Dependency Injection (DI)
• Beans, Beans Lifecycle Methods
• Beans Scopes
• Spring AOP
• Spring Beans Configurations - XML based and Java based

Spring Boot

• Spring Boot Features
• Spring Boot Starter
• Embedded Server Support
• Autoconfiguration
• Spring Profiles
• Spring Boot Actuator
• Elegant Configuration Management

REST APIs

• REST API Desing Practices
  • API versioning
  • Use of Proper Verbs and Resource names
  • Pagination, Sorting and Filtering
  • Bean Validation
  • Exception Handling
  • Status Codes (2xx, 4xx, 5xx)
  • Idempotency
  • Rate Limiting
• Controller/RestController
• RequestMapping - Get, Post, Put, Patch, Delete
• RequestBody and RequestParam
• File Upload and File Download
• Documenting - Swagger/OpenAPI

Spring Security

• API security important
• Authentication and Authorization
• JWT based Authentication
• OAuth2.0
• Keycloak
• Role based Access

Data Access

• Databases
  • DBMS
  • RDBMS
  • SQL - MySQL, Postgresql
  • NoSQL - Cassandra, MongoDB
• JDBC
• Hibernate
• Persistance
• Redis for caching and sessions
• Test Containers for Databases

REST API Clients

• RestClient - Synchronous, Blocking
• WebClient - Reactive, Non-Blocking

Testing

• Unit Testing with Jnit6
• Mockito
• Integration Testing
• Test Containers for Databases
• MockMvc and WebTestClient
• SpringBootTest Annotation
• DataJpaTest Annotation

Microsevices

• Spring Cloud Projects
  • Spring Cloud Config Server
  • Spring Cloud Cloud Gateway
  • Netflix - Eureka client/server
  • Spring Cloud Circuit Breaker
  • Spring Cloud OpenFeign
  • Spring Cloud Security
• Design Pattern
  • saga
  • API Gateway
  • Database per service
  • Event Sourcing
  • CQRS

Messaging Systems

• RabbitMQ
• Kafka

Containers and Cloud

• AWS/GCP/Azure
• Linux
• Docker
• Kubernetes

DevOps and Observablility

• CI/CD
• Logging
• Metric
• Tracing
• Centralized Logging using ELK