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prerequisites
intermediate JUnit5 • intermediate Spring • beginner Maven • beginner Hibernate • working knowledge of Java 11 • working knowledge of object-oriented programming
skills learned
use IntelliJ IDEA to write and execute tests • reproduce problems in hard-to-reach parts of a system with tests • use tests to drive bug fixes • use Hibernate and an in-memory database to inspect the results of service execution • mock S3 containers
Max Guernsey, III
1 week · 6-8 hours per week · INTERMEDIATE
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Create an alarm system that warns you before your system breaks. You’re a Java developer for a large company that sells stock photography. You’re responsible for the service that ingests images. A recent upgrade to the image scaling library has caused a problem with the aspect ratio of thumbnail images. Working in IntelliJ IDEA, you’ll build a layer of integration tests that replicates the problem and also tests assumptions that your unit tests rely on. When you’re done, you’ll have an alarm system that warns you when the assumptions your unit tests rely on are no longer valid, preventing problems in the future.

This project is designed for learning purposes and is not a complete, production-ready application or solution.

project author

Max Guernsey, III

Max Guernsey has over twenty years of experience in software development and is currently a managing member at DevCraft LLC. He has worked on a wide range of products and technologies, including C++ class libraries, financial analysis applications, C# and Java backends, and even multi-platform video games. He is an experienced consultant and his "coaching from the keyboard" approach provides hands-on experience to learners in all aspects of modern software development.

prerequisites

This liveProject is for developers with an intermediate-level understanding of Java and object-oriented design. To begin these liveProjects you’ll need to be familiar with the following:

TOOLS
  • JUnit5
  • Spring
  • Maven
  • Hibernate
TECHNIQUES
  • Working knowledge of Java 11
  • Working knowledge of object-oriented programming

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