Learn how to detect and fix thread leaks in Java applications using Java 21, thread dumps, ExecutorService, monitoring tools, and Spring Boot examples.

Introduction

Imagine running a restaurant where employees keep showing up for work but never leave.

At first, everything seems fine. But after a few hours, the kitchen becomes crowded, employees bump into each other, and service slows down. Eventually, the restaurant stops functioning.

That’s exactly what happens during a thread leak in Java applications .

Threads are essential workers inside a Java application. They process web requests, background jobs, database operations, and scheduled tasks.…