Core Java
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How to Conditionally Skip Tests in TestNG
In real-world automation frameworks, running every test on every execution is neither practical nor efficient, as test execution often depends…
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An Introduction to @ClassTemplate in JUnit 5
JUnit 5 offers several extension points that allow developers to customize how tests are discovered and executed. One of these…
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Computing Cosine Similarity Between Two Vectors in Java
Cosine similarity is a common metric used to measure how similar two vectors are, based on the angle between them…
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Maven 4 Highlights
Apache Maven 4 is the next major version of the widely-used build automation and project management tool for Java projects.…
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Kotlin’s Null Safety: How to Fix Java’s Billion-Dollar Mistake Without Breaking Everything
In 2009, computer scientist Tony Hoare apologized for inventing the null reference in 1965. He called it his “billion-dollar mistake,”…
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Apache POI HSSFWorkbook: Read, Write, and Stream Excel
Working with Excel files is a common requirement in enterprise Java applications, whether for reporting, data exchange, or bulk uploads.…
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Using @ConcreteProxy in Hibernate
Hibernate is a powerful ORM framework, but its use of proxies for lazy loading can sometimes lead to subtle and…
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Monads Unmasked: The Category Theory You’re Already Using Without Knowing
Mention “monads” to most developers and watch their eyes glaze over. The term carries baggage: intimidating mathematical jargon, abstract category…
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How to Reset and Reuse InputStream
In Java, InputStream is commonly used to read data from files, network sockets, or in-memory buffers. A frequent requirement is…
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