Core Java
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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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Jackson MongoDB POJO Mapping Example
In Java-based applications using MongoDB, converting data between MongoDB’s native document representation and Java Plain Old Java Objects (POJOs) is…
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Java’s Checked Exceptions: The 20-Year Experiment That Failed
In 1996, Java introduced a bold experiment: checked exceptions. The compiler would force developers to handle errors, making software more…
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Getting Started with MyBatis Dynamic SQL
MyBatis Dynamic SQL is a type-safe Java DSL (Domain-Specific Language) for building SQL queries programmatically instead of writing SQL strings…
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