allegient-labs / bootcamp-java

DMI Java and Spring Bootcamp Exercises

DMI Developer Boot Camp: Java/Spring

Introductory Topics

1. Overview of JUnit and Hamcrest
2. What are good unit tests?
   • Small
   • Repeatable
   • Independant
3. Overview of Maven
   • The POM
   • Project Structure
   • Dependency Management
   • Project Build Lifecycle
4. Understanding Maven Versioning
5. Basics for most Java projects
   • Configure the POM for Java 8+
   • Configure for JUnit
6. Exercise

Step 1: Java/Spring

Basics of Java Web Development

1. A little history
   • How we did Java dev without/before Spring
   • Why is Spring so dominant?
2. Basics of Java Web Development
   • The Servlet API
   • Servlet Containers
   • WAR Packaging
   • Deployment

Basics of Spring

1. Overview of the Spring Container and Dependency Injection (IoC)
2. Overview of Spring Initializr
3. Structure of Modern Java Web Applications (Hexagonal)
   • Why we build applications this way (testable)
   • Recomendations for package structure
4. Overview of Spring REST
5. Overview of Swagger
6. Exercise

Interlude - Cloud Native Development and DevOps

This is Andrea and Jim's SWAT talk regarding the cloud.

Step 2: Pivotal Cloud Foundry

1. What is PCF?
2. Basic PCF Commands
3. Apps, Routes, Services, Spaces, etc.
4. Exercise
   • Create a free Pivotal Web Services account
   • Install the PCF CLI
   • Create a manifest file for your application
   • Push your application to PCF
   • Scale the app up/down

Step 3: Using Cloud Services

1. Overview of Redis
2. Spring support for Redis
3. Redis in PCF
4. Changes in Spring configuration for the cloud (covers Spring profiles)
5. Exercise
   • Create a free Redis service in your PCF instance
   • Create a Redis implementation of the HitCounter service
   • Modify your Spring configuration to use Redis in the cloud
   • Push your update to PCF and verify that the hit count persists through application stop/start

Step 4: JPA/CRUD/REST

1. Overview of JPA
2. Configuring a Spring CRUD Repository
3. Spring support for in-memory databases for testing
4. Overview of different REST Methods (Safe, idempotent, etc.)
5. Creating a REST controller for CRUD
6. Exercise

Step 5: JPA in the Cloud

1. Spring cloud support for PostreSQL
2. How to use an in-memory database for testing and PostgreSQL for production
3. Exercise
   • Create a free PostgreSQL service in your PCF instance
   • Change the Spring configuration to use PostgreSQL in the Cloud
   • Change the manifest to map PostgreSQL to your application
   • Deploy, Test