Core Java
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Getting Process ID in Java
Every running Java Virtual Machine (JVM) application executes as an operating system process. Like every other process, the JVM is…
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LangChain4j RAG in Java: Embedding, Chunking, and Retrieval Without the Python Envy
A practical pipeline for document ingestion, embedding, and retrieval, all on the JVM, with a Spring AI comparison for good…
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The Diamond Problem and Default Methods
Java 8 gave interfaces actual behavior, then had to answer the same question C++ has been arguing about for thirty…
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Fixing Hibernate Illegal Attempt to Map a Non Collection Error
Hibernate is one of the most widely used Object Relational Mapping (ORM) frameworks in Java applications. It allows developers to…
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Java SQL String Building Example
Building SQL queries dynamically is a common requirement in Java applications. Search screens, filtering APIs, reporting modules, and administrative dashboards…
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Exploring CTE Support in Hibernate with HQL
Common Table Expressions (CTEs) are one of the most powerful SQL features for writing readable, reusable, and recursive queries. Prior…
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Project Valhalla’s Value Classes Are Finally Real
What the new value keyword actually changes about heap layout, and why data-heavy Java applications should pay attention. For more than a…
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The Expression Problem: Why Java’s Sealed Interfaces Are One Answer, Not The Answer
Adding a new type is trivial in object-oriented code. Adding a new operation is trivial in functional code. Nobody has…
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Sealed Interfaces and Exhaustive Switch: Making Illegal States Unrepresentable
A compact, runnable example showing how sealed hierarchies plus pattern-matching switches turn a whole category of bugs into compile errors.…
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