Purpose of Using dumpStack Method in Java

The dumpStack() method is a static method of Thread class and it can be used to print or display stack tracing of the current thread to System.err. The purpose of the dumpStack() method is basically for debugging and Internally this method is calling the printStackTrace() method of Throwable class. This method does not raise any exceptions.

Syntax

public static void dumpStack()

Example

public class ThreadDumpStackTest {
   public static void main(String args[]) {
      Thread t = Thread.currentThread();
      t.setName("ThreadDumpStackTest");
      t.setPriority(1);
      System.out.println("Current Thread: " + t);
      int count = Thread.activeCount();
      System.out.println("Active threads: " + count);
      Thread threads[] = new Thread[count];
      Thread.enumerate(threads);
      for (int i = 0; i < count; i++) {
         System.out.println(i + ": " + threads[i]);
      }
      Thread.dumpStack();
   }
}

Output

Current Thread: Thread[#1,ThreadDumpStackTest,1,main]
Active threads: 1
0: Thread[#1,ThreadDumpStackTest,1,main]
java.lang.Exception: Stack trace
	at java.base/java.lang.Thread.dumpStack(Thread.java:2282)
	at ThreadDumpStackTest.main(ThreadDumpStackTest.java:14)