Java development Archives

Fixing “Cannot Resolve Symbol” in IntelliJ Even When Code Compiles

By admin April 10, 2025

One of the most frustrating issues developers encounter in IntelliJ IDEA is the "Cannot resolve symbol" error—especially when the code compiles and runs just fine. If you've seen red underlines…

How to Round Numbers to N Decimal Places in Java (Without Trailing Zeros)

By admin April 3, 2025

Rounding numbers in Java seems simple—until you encounter trailing zeros, incorrect rounding modes, or floating-point inaccuracies. This guide explains three reliable methods to round decimals in Java while avoiding common…

How to Fix java.lang.UnsupportedClassVersionError: A Complete Guide

By admin March 31, 2025

Encountering the java.lang.UnsupportedClassVersionError is a common issue for Java developers. This error occurs when your Java Runtime Environment (JRE) is older than the version used to compile the class file.…

StringBuilder vs StringBuffer in Java: Key Differences, Performance, and When to Use Each

By admin March 31, 2025

When working with mutable strings in Java, two classes stand out: StringBuilder and StringBuffer. Both are designed for efficient string manipulation, but they differ in critical ways that impact performance…

Understanding JavaBeans: Conventions, Usage, and Best Practices

By admin March 27, 2025

JavaBeans are a crucial part of Java programming, enabling the creation of reusable and interoperable components. This post dives into what JavaBeans are, their key conventions, and how they differ…

How to Check if a Java Array Contains a Value – Best Methods Explained

By admin February 28, 2025

Checking whether a Java array contains a specific value is a common programming task. In this guide, we’ll explore multiple efficient methods to test array membership, compare their performance, and…

Common Spring Boot Mistakes and How to Fix Them

By admin February 23, 2025

Spring Boot simplifies Java development, but improper usage can lead to performance bottlenecks and maintainability issues. Whether you're building a fintech application like a core banking system or an e-commerce…

How to Fix java.lang.NoClassDefFoundError: org/w3c/dom/ls/DocumentLS During JDK 11 to JDK 17 Migration

By admin February 14, 2025

Migrating a Spring Boot application from JDK 11 to JDK 17 can sometimes lead to unexpected runtime errors, especially when dealing with XML parsing and dependencies. One such common error…

How to create a Spring Library and consumers can import all the beans automatically?

By admin February 11, 2025

Do you want your custom Spring Boot library to seamlessly integrate into consumer applications, automatically registering necessary beans without manual configuration? This approach, similar to official Spring Boot starters, can…

Is Java “pass-by-reference” or “pass-by-value”?

By admin February 9, 2025

Are you confused about whether Java uses pass-by-value or pass-by-reference? You're not alone! This is a common question for Java developers. Let's break down this concept with clear explanations, analogies,…