Ken Kousen
Live online courses, books, and videos on O’Reilly
Upcoming live online training courses
October 1, 2025
Agentic Coding with OpenAI Codex CLI
Unlock the Potential of AI-Driven Coding Course Outcomes Understand how to use OpenAI Codex CLI for software development Course Description Elevate your development skills with OpenAI Codex CLI. This course provides ...
October 6, 2025
LangChain4j
It does the same with a variety of embedding stores, making it easy to implement retrieval-augmented generation (RAG) to add your own data to the models. Join expert Ken Kousen to ...
October 13, 20 & 27, 2025
Spring and Spring Boot in 3 Weeks
The surest route to adding Spring and Spring Boot to your developer toolkit is learning directly from one of the masters of the field. Join acclaimed developer, trainer, and consultant Ken ...
October 15, 2025
Managing your manager
Many times, management decisions can seem capricious, arbitrary, or frustrating, but it doesn't have to be that way. In this three-hour hands-on course, Java Champion Ken Kousen shares the tips and ...
November 7, 2025
Leveraging Java’s Latest Features
With Oracle’s bi-annual releases of Java introducing new features, the language is continuously transforming and evolving. Join expert Ken Kousen as he guides you through the most important features of recent ...
November 10, 2025
AI Coding with Junie
Autonomous task execution for complex coding in your JetBrains IDE Course Outcomes Ability to use Junie for AI-assisted software development Course Description Unlock the full potential of AI-assisted development with Junie, ...
November 17, 2025
Integrating AI in Java Projects
Access ChatGPT, Claude, Gemini, and other AI tools in your Java programs Course outcomes Access AI-based RESTful web services, such as those offered by OpenAI, Claude, or Gemini Apply Java records ...
December 1, 2025
Agentic Coding with Claude Code
Harness the power of AI-assisted coding Course outcomes Understand how to use Claude Code for software development Course description Join expert Ken Kousen to elevate your development skills with Claude Code, ...
December 3, 2025
Spring AI
Combining the OpenAI API with Java and the Spring Framework Course outcomes Connect to LLM tools like ChatGPT message chains, prompt templates, and output parsers using Spring AI Take advantage of ...
December 8, 2025
Agentic Coding with Gemini CLI
Gemini CLI offers a developer-friendly solution that integrates AI assistance directly into your software development workflow. In this course, Ken Kousen will teach you how to use Gemini CLI to refactor ...
Bio
Ken Kousen is the President of Kousen IT, Inc., through which he does technical training, mentoring, and consulting in all areas related to Java, specializing in Android, Spring, Kotlin, Groovy, and Gradle. He is the author of the "Kotlin Cookbook", "Modern Java Recipes", and "Gradle for Android", all from O'Reilly Media, and "Making Java Groovy" from Manning.
Ken is a Java Champion and a regular speaker on the No Fluff, Just Stuff conference tour, and has spoken at many international conferences. He is also a multiple winner of the JavaOne Rock Star award. Over the past decade he has taught thousands of developers in business and industry. In addition to owning several technical certifications, his academic background includes two BS degrees from M.I.T., an MS and a Ph.D. from Princeton, and an MS in Computer Science from R.P.I.