© 2026 Hashnode
Source: Reasons Java services get slower after a few hours: How to find thread pool saturation? You boot a service at 03:00 and it behaves beautifully: sub-second responses, healthy throughput. By noon, requests start lagging. After an outage ticke...

Source: Reasons Thread Pool Misconfiguration Creates Fake Throughput in Java Backends 1. A quiet alarm: why you shouldn't trust requests/sec alone In a production incident I investigated, dashboards showed impressive requests/sec during a sudd...

Source: Reasons Circuit Breakers Fail in Real Systems When Timeouts, Retries, and Bulkheads Fight Each Other 1. Why your "smart" circuit breaker still blows up your system Production systems rarely fail in isolation. Instead they fail as emerg...

Source: Techniques for Writing Thread-Safe Code Without Using Synchronized Locks 1. What thread-safe code really means without locks Thread safety is often misunderstood as merely “preventing crashes when multiple threads run.” That definition...

Source: Series of Questions in Backend Developer Interviews Part 3 1. Deep Copy vs Shallow Copy – What Really Happens? Developers often say “shallow copy copies reference, deep copy copies data,” but this shortcut hides the subtlety that expla...

Source: Series of Backend Interview Questions for Java Developers Part 2 1. What does a thread dump contain, and how do you detect deadlocks from a stack trace? A thread dump is essentially an MRI scan of the JVM’s brain taken at a specific mo...

Source: Techniques to Manage Global Variables in Spring Boot Without Breaking Thread-Safety 1. Introduction: Why “Global Variables” Are a Hidden Danger in Spring Boot 1.1 The Naive Way — And Why It Fails Consider this simple (but dangerou...

Source: Techniques for Configuring Executors and Guava RateLimiter for Effective Multithreaded Processing 1. Understanding Executors and Their Role in Multithreading 1.1 What is an Executor? In Java, the Executor framework provides a high...
