How Can I Retrieve a Complete List of All Running Java Threads?

Retrieving a Comprehensive List of Running Threads in Java

Knowing about the threads executing within a JVM is crucial for debugging purposes and performance profiling. This article explores how to obtain a list of all threads currently running within the JVM, including those not initiated by the current class.

Obtaining an Iterable Thread Set

To acquire an iterable set of threads, leverage the Thread.getAllStackTraces() method. Its .keySet() method provides a set of threads that are currently executing. The code snippet below demonstrates this:

Set<Thread> threadSet = Thread.getAllStackTraces().keySet();

This operation efficiently gathers all threads running in the JVM, irrespective of their source.

Note: The performance of this method for 12 threads on Azul JVM 16.0.1 running on Windows 10 with a Ryzen 5600X processor is approximately 0 ms.

Additional Context for Thread Inspection

If you require further information about each thread, such as their name, status, or associated class, you can iterate through the thread set and retrieve these details explicitly. For instance:

for (Thread thread : threadSet) {
    System.out.println(thread.getName() + " - " + thread.getState());
    System.out.println("\t" + thread.getClass());
}

By using this approach, you can obtain a granular understanding of the threads executing within the JVM, enabling you to effectively troubleshoot issues, optimize performance, and manage concurrency.

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