ReproFix is a blog about errors that show up after upgrading Java backend tools, and how to fix them.
Every post starts from a real error that developers have reported on recent releases of Spring Boot, Spring AI, PostgreSQL, Flyway, Docker, and the tools around them. I rebuild the problem in a small project on my own machine, run it until the same error appears, and then write down what caused it and what fixed it.
How each post is made
- Reproduced locally. The code, error messages, and logs in a post come from a project I actually ran. I don’t paste errors from memory or make up output.
- Version-pinned. Each post lists the exact versions I tested with. If you’re on a different version, the cause or the fix may be different.
- Checked against official sources. Explanations are based on official documentation, release notes, and issue trackers. Each post links them in the References section so you can verify the details yourself.
- Written for the fix, not the theory. Posts go straight from the symptom to the cause and the fix, including the mistakes I ran into along the way.
Topics
| Category | What it covers |
|---|---|
| Java & Spring Boot | Spring Boot, Spring Security, Spring Data JPA, Java 21+ |
| Spring AI | Spring AI, RAG, vector stores, MCP, Ollama |
| Database | PostgreSQL, MySQL, Oracle, SQL tuning, Flyway, Liquibase |
| DevOps | Docker, Docker Compose, Testcontainers, GitHub Actions, Maven |
Corrections
Tools change fast, and a fix that worked on one release can break on the next. If something in a post is wrong or out of date, please tell me through the Contact page. I’ll re-run the example and update the post.
Disclaimer
ReproFix is an independent blog. It isn’t affiliated with or endorsed by the Spring team, Broadcom, Oracle, the PostgreSQL Global Development Group, Docker, Inc., or any other project or company mentioned here. Product names belong to their owners.
The code in this blog is provided as-is for learning and troubleshooting. Test any change in your own environment before using it in production.