Free open-source Spring Boot kit simulates real backend developer workflows

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A developer has released springboot-learning-kit, a free and open-source project designed to give Spring Boot learners hands-on experience with real-world backend tasks beyond basic CRUD applications. The kit includes 12 structured tasks covering areas such as messaging with ActiveMQ and RabbitMQ, database migrations with Liquibase, testing with Mockito and TestContainers, and load testing with JMeter. The entire environment runs locally via Docker Compose, and a Bruno API collection is included to simplify endpoint testing. The project also covers observability topics like Prometheus metrics and Grafana dashboards, as well as code style enforcement and global exception handling. The creator has made the repository publicly available on GitHub and is actively seeking community feedback.

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Snowflake to Databricks Migration: Real Costs and Trade-offs Teams Must Know

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ProgrammingDEV Community ·

How to Use Docker Engine as a Kubernetes Runtime via cri-dockerd on Ubuntu

Since Kubernetes 1.24 removed native dockershim support, users who need Docker Engine as a node runtime must now rely on cri-dockerd, an open-source CRI adapter maintained by Mirantis. The setup involves installing Docker Engine from its official repository, configuring the systemd cgroup driver, and pointing the kubelet to the cri-dockerd socket during cluster initialization. This approach is recommended only for specific use cases, such as teams with Docker-dependent tooling, shared image stores, or vendor requirements that assume Docker Engine. While the shared image store between kubelet and Docker is a convenience, administrators are advised to use crictl for managing cluster containers to avoid interfering with Kubernetes-managed processes. For most users without these specific needs, containerd remains the simpler and more reliable alternative.

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ProgrammingHacker News ·

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ProgrammingDEV Community ·

Developer builds real-world quoting system with .NET 10 and Blazor Server

A developer built a full budget management system for a glass shop that previously handled all quotes manually, using .NET 10 and Blazor Server as the core stack. The project included a product catalogue with multi-supplier pricing, margin calculations, PDF export, and local network deployment. Key challenges included designing Entity Framework Core delete rules to reflect actual business logic, such as preventing client deletion when quotes exist. A recursive in-memory search component was built to filter a nested product catalogue without hitting the database on every keystroke. The hardest bug involved Blazor buttons silently stopping work due to global layout components rendering in static mode outside the interactive render tree, revealing that render mode in Blazor Web App propagates only to descendants, not sibling components.

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