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Building a Cleaner Projection Layer on Top of JPA Criteria API
If you develop systems using Java with JPA, you have probably faced the need to execute queries that return only a subset of attributes from a given entity. At first glance, this may seem simple. However, when not handled properly, systems tend to accumulate redundant queries or methods that load entire entities when only a few attributes are actually needed. In many real-world scenarios, we often need to retrieve only fields like “id” and “name”. In large or complex systems, it becomes difficult to know whether a specific projection already exists. As a result, developers either duplicate queries or reuse methods that fetch more data than necessary. ProjectionQuery was created to address exactly this problem. It provides a clean and expressive way to define projection-based queries, helping you select only the data your application truly needs, in an organized and reusable way. If this resonates with challenges you’ve faced, I’d love for you to take a look at the documentation and the GitHub repository. Feel free to try it out, open issues, suggest improvements, or share your feedback. Contributions and ideas are always welcome!
Intro:
Hello Community Members, 1. I am based in Chicago, IL (USA) and work as a Java Engineer with over 2 years of experience primarily in backend development, along with some exposure to frontend technologies. 2. I have been seeking a knowledgeable and collaborative community to continue learning and growing, and this group strongly aligns with those goals. Brother Nelson Djalo’s commitment and dedication were a key inspiration for me to join and engage with this community. 3. I joined the Skool platform last year, and this is my first active community group. I look forward to participating meaningfully, learning from experienced members, and contributing where possible. Thank you for the opportunity to be part of this community.
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Video Request: Apache Kafka Complete Guide for Java Developers
Hey Nelson! 👋 I'm a big fan of your Java Master Class and wanted to suggest a tutorial that would be incredibly valuable: A comprehensive Apache Kafka course. Why This Matters Kafka is essential for modern backend development, but there's a lack of practical, end-to-end tutorials in your signature hands-on style. Most developers struggle with production-ready Kafka implementations. What to Cover Core Topics: - Kafka Admin - Setup, topic management, configurations - Producers - Publishing events, serialization, error handling - Consumers - Consumer groups, offset management, rebalancing - Data Model - Event design, partitioning strategies, schema evolution - Kafka Streams - Stream processing, transformations, aggregations Real-World Project: Build an e-commerce order processing system showing all components working together with proper error handling and monitoring. 👍 If you find this useful, smash the like button to notify Nelson and help make this tutorial happen! @Nelson Djalo
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