Core Java
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Java PostgreSQL Query Cancellation Explained
PostgreSQL is known for its robustness, performance, and strong support for concurrency. However, while working with long-running queries, background jobs,…
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The Philosophy of Null: Why Java’s Billion-Dollar Mistake Isn’t Actually a Mistake
In 2009, Tony Hoare apologized for inventing null references, calling it his “billion-dollar mistake.” The programming world nodded in agreement.…
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Joining Unrelated Tables with JPA Criteria API
In real-world enterprise applications, it is common to encounter database tables that do not have explicit JPA relationships (such as…
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How to Fix Hibernate’s token ‘*’ SyntaxException
Hibernate’s JPQL (Java Persistence Query Language) provides an object-oriented abstraction over SQL, allowing us to query entities instead of database…
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Fixing java.io.NotSerializableException
The java.io.NotSerializableException is a common runtime exception in Java that occurs during the serialization process. Serialization is the mechanism of…
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EBCDIC to ASCII Conversion in Java
Many enterprise systems still rely on legacy platforms such as IBM mainframes, where data is commonly stored using EBCDIC (Extended…
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Create Unique and Valid Identifiers in Java
Generating valid and unique identifiers is a fundamental requirement in software systems. Identifiers are used to uniquely represent entities such…
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Code as Literature: What Ernest Hemingway Can Teach You About Writing Java
Every programmer has experienced it—that moment when you open a file and the code just makes sense. The logic flows…
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How to Collect Entity IDs from Java Collections
In many applications, we often work with collections of domain entities retrieved from a database, API, or in-memory source, and…
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