How Can I Get a List of All Running Threads in a Java Virtual Machine?

Get a List of All Running Threads in Java

The task of obtaining a comprehensive list of all active threads within a Java Virtual Machine (JVM) is crucial for debugging, performance analysis, and understanding system behavior.

Obtaining an Iterable Set of Threads

To acquire an iterable set of all currently running threads, including those not initiated by the current class, utilize the following code snippet:

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

This approach efficiently generates a set of Thread objects representing each active thread in the JVM.

Retrieving Thread and Class Objects

In conjunction with the set of Thread objects, it is possible to obtain the corresponding Class objects for each thread. By utilizing the Thread.getStackTrace() method, you can access an array of StackTraceElement objects, which contain valuable information such as the class of the thread.

Performance Considerations

The performance of the code depends on the number of active threads in the JVM. Based on empirical observations, a JVM running 12 threads exhibits an execution time of approximately 0 milliseconds on an Azul JVM 16.0.1 configured on Windows 10 with a Ryzen 5600X processor.

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