Java
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Role-Based Feature Flags in Spring Boot with Unleash or FF4J
Feature flags let you decouple deployment from release. But what if you want to roll out a feature only for…
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Spring Security + OAuth2 Resource Server: How to Validate JWTs Like a Pro
OAuth2 and JWT (JSON Web Tokens) have become the standard for securing APIs in modern microservices and web applications. When…
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Enable or Disable Embedded Tomcat in Spring Boot Using Profiles
In many Spring Boot applications, especially those that support multiple deployment modes, it is common to encounter different runtime environments.…
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Introduction to J2CL
J2CL (Java to JavaScript Compiler) is a Google-backed compiler that enables Java source code to be transpiled into optimized JavaScript.…
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Best Practices for Storing and Validating Passwords in Java (BCrypt, Argon2, PBKDF2)
Password security is critical for any modern application. Java developers often face the question:Which algorithm should I use? In this…
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Fine-Grained Authorization with Spring Security and @PreAuthorize Annotations
Spring Security provides powerful tools to secure your Java applications—but one of its most underrated features is method-level authorization using…
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Fix Cannot Load Driver Class: com.mysql.jdbc.driver in Spring Boot
1. Introduction The “can not find driver exception” with “com.mysql.jdbc.driver" means that the Spring Boot application can not load the…
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Securing GraphQL with Spring Security: A Practical Guide
GraphQL provides a flexible and efficient way to query APIs, but with that power comes the need for robust security.…
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Getting Started with OSHI
OSHI (Operating System and Hardware Information) is a free, open-source Java library used to retrieve system information like CPU, memory,…
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