Java
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Core Java
Java HttpSession Object Storage
In Java web applications, maintaining user state across multiple requests is essential. Since HTTP is a stateless protocol, we use…
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Software Development
The Dead Letter Queue Problem: Why Your Async Systems Silently Lose Data
Every async system eventually faces the same rude awakening: a message that can never be processed sits in your queue,…
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Core Java
SQLite in 2026: Why Serious Apps Are Choosing It Over Postgres
For two decades, SQLite was the database you used in tests, mobile apps, and quick prototypes — and then swapped…
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Enterprise Java
Spring Boot Dependency Injection using @Autowired
Spring Boot is a widely used framework for building production-ready Java applications with minimal configuration. At the core of Spring…
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Core Java
Fixing PatternSyntaxException: Unclosed Character Class
In Java, regular expressions are widely used for pattern matching, validation, searching, and string manipulation. The Java Regex API provides…
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Core Java
Java IPv4 to IPv6 Conversion
With the growing demand for IP addresses, IPv6 was introduced as a successor to IPv4. While IPv4 uses 32-bit addresses,…
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Enterprise Java
Resolving the “Validation Failed for Query for Method” Error in Spring Data JPA
This article explains how to diagnose and resolve the error “Validation failed for query for method” in Spring Data JPA.…
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Core Java
A Guide to Exporting and Backing Up H2 Databases
Data protection is a critical aspect of application development. Applications that rely on embedded databases, such as the H2 Database…
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Core Java
GraalVM Native Image vs Project Leyden: Two Answers to the Same Cold-Start Problem
Leyden’s AOT approach is fundamentally different from GraalVM’s closed-world assumption. Here is what architects actually need to know to choose…
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