Devoxx Courses

Quantum Computing Exposed - Deep Dive

A visual introduction demystifies qubits and quantum gates, then explores how Shor’s algorithm could threaten RSA encryption.

• YouTube
• 2 hours 42 minutes
• Self-Paced
• Conference Talk

Parallel and Asynchronous Programming with Streams and CompletableFuture

Explores the gotchas of Java 8 parallel streams and asynchronous tasks, including when to use them and when to avoid them.

• YouTube
• 2 hours 35 minutes
• Self-Paced
• Conference Talk

Comparison Method Violates Its General Contract! - Part 1

Learn why malformed Java comparators trigger sorting exceptions and how Java 8 utilities help compose correct, sophisticated comparators.

• YouTube
• 30 minutes
• Self-Paced
• Conference Talk

Comparison Method Violates Its General Contract! - Part 2

Learn how subtle Comparator contract violations trigger sorting failures, and how Java 8 composition methods help build correct, sophisticated comparators.

• YouTube
• 30 minutes
• Self-Paced
• Conference Talk

Deploy Microservices with Certainty

Learn how consumer-driven contracts can catch incompatible service changes before they break a microservices deployment.

• YouTube
• 32 minutes
• Self-Paced
• Conference Talk

WebHooks vs WebSub - Which One to Stream Your Events in Real Time

Compare WebHooks and WebSub for real-time API events, focusing on how to implement each and choose between them.

• YouTube
• 26 minutes
• Self-Paced
• Conference Talk

Collectors in the Wild

Explore Java collectors beyond built-in reductions, composing downstream collectors into readable data-processing pipelines and examining performance.

• YouTube
• 2 hours 47 minutes
• Self-Paced
• Conference Talk

Slice & Dice Your Monolith with Domain Driven Design

Refactor an anemic legacy monolith through live coding, using bounded contexts to encapsulate data and behavior.

• YouTube
• 2 hours 31 minutes
• Self-Paced
• Conference Talk

Empathetic Communication at Work

A workshop on using empathy to reshape workplace conversations, from active listening and fair disagreement to responses that help others understand your message.

• YouTube
• 2 hours 43 minutes
• Self-Paced
• Conference Talk

Not All Equals Methods Are Created Equal

Learn to spot bugs in IDE-generated equals methods, build a robust implementation, and verify it with one line of test code.

• YouTube
• 28 minutes
• Self-Paced
• Conference Talk

Design Patterns with Kotlin

Revisits Gang of Four design patterns by implementing them in Kotlin with IntelliJ’s native Kotlin support.

• YouTube
• 31 minutes
• Self-Paced
• Conference Talk

Neural Networks - Walkthrough

A visual walkthrough demystifies neural networks, explaining what tanh does and why training may fail to converge.

• YouTube
• 1 hour 50 minutes
• Self-Paced
• Conference Talk

The Art of Clean Code

Learn to spot code smells and use refactoring techniques to make code more expressive and easier to maintain.

• YouTube
• 57 minutes
• Self-Paced
• Conference Talk

Java Performance Techniques - The Cost of HotSpot Runtime Optimizations

Explores how HotSpot’s runtime optimizations can speed up Java—and how deoptimization and other hidden costs can make them backfire.

• YouTube
• 54 minutes
• Self-Paced
• Conference Talk

SOA Lessons Learnt or Microservices Done Better

Learn from SOA’s successes and failures to avoid common pitfalls when building microservices.

• YouTube
• 52 minutes
• Self-Paced
• Conference Talk