Concurrency is both the boon and bane of software development. The promise of enhanced performance through parallel processing comes hand in hand with intricate challenges, such as the notorious deadlock. Deadlocks, those insidious hiccups in the world of multithreaded programming, can bring even the most robust application to its knees. It describes a situation where two or more threads are blocked forever, waiting for each other.
In this blog post, we dive deep into a real-world deadlock saga triggered by the seemingly innocent use of Java’s parallelStream. We’ll dissect the root cause and scrutinize thread stack traces.