How to generate a thread dump that looks similar to what you get from JVisualVM?

Question

If I want to generate a thread dump and log it within my application (for diagnostic purposes), are there any utilities for generating one, or am I stuck cobbling together my own?

Because I want my application to do it itself based on certain conditions. — Jun-Dai Bates-Kobashigawa, Nov 05 '13 at 19:46
you might want to check this answer: http://stackoverflow.com/a/240217/594406 — Katona, Nov 05 '13 at 19:53

score 1 · Answer 1 · edited May 23 '17 at 11:43

1

This is a semi-duplicate of this question. Check out my answer here:

Generate a Java thread dump without restarting.

This does an approximation of the output seen when you do a kill -QUIT <my-pid>. Not sure how much that matches the JVisualVM output.

The full code for the Thread stack dump method is posted on pastebin. A sample of the code is in the question listed.

edited May 23 '17 at 11:43

Community

1
1

answered Nov 05 '13 at 20:15

Gray

115,027
24
293
354

score 0 · Answer 2 · edited May 23 '17 at 12:14

0

Did you try StackTraceElement[] cause = Thread.currentThread().getStackTrace(); as recommended in Determining Current Call Stack (For Diagnostic Purposes).

Related Q/A:

edited May 23 '17 at 12:14

Community

1
1

answered Nov 05 '13 at 19:47

Aleš

8,896
8
62
107

Note that you should post question as duplicate instead of using it as your own answer. – Luiggi Mendoza Nov 05 '13 at 19:48
Also, none of the links posted helps OP to get a thread dump from the running application. – Luiggi Mendoza Nov 05 '13 at 19:49
Yes, but that's the starting point for cobbling together my own solution. I wanted to know if there were any libraries that will generate the full dump with thread names, locks, etc., formatted in a way that most thread dump analysis tools will understand. – Jun-Dai Bates-Kobashigawa Nov 05 '13 at 19:50
@LuiggiMendoza : I agree, this is a duplicate question. I won't mind if its flagged for close. – Aleš Nov 05 '13 at 19:51
@Jun-DaiBates-Kobashigawa that's covered in the possible duplicate question link. – Luiggi Mendoza Nov 05 '13 at 19:52

score 0 · Answer 3 · answered Nov 05 '13 at 19:52

I'm currently using this. Not sure if it's exactly what you want.

import java.io.PrintWriter;
import java.io.StringWriter;
import java.lang.management.ManagementFactory;
import java.lang.management.ThreadInfo;
import java.lang.management.ThreadMXBean;
public class ThreadDumper
{
    public static String dumpThreads()
    {
        StringWriter sw = new StringWriter();
        PrintWriter pw = new PrintWriter(sw);           
        try
        {
            ThreadMXBean bean = ManagementFactory.getThreadMXBean();
            ThreadInfo[] threadInfos = bean.getThreadInfo(bean.getAllThreadIds(), Integer.MAX_VALUE);
            for (int i = 0; i < threadInfos.length; i++)
            {
                ThreadInfo threadInfo = threadInfos[i];
                pw.print(threadInfo);
            }

            pw.println("----------------------------------------");
            pw.println();

            long[] deadlockedIds = bean.findMonitorDeadlockedThreads();
            if(deadlockedIds == null || deadlockedIds.length == 0)
            {
                pw.println("Detected 0 deadlocked threads.");
            }
            else
            {
                pw.println("Detected " + deadlockedIds.length + " deadlocked threads:");
                threadInfos = bean.getThreadInfo(deadlockedIds, 0);
                for (int i = 0; i < threadInfos.length; i++)
                {
                    ThreadInfo threadInfo = threadInfos[i];
                    pw.print(threadInfo);
                }
            }
        }
        catch(Exception e)
        {
            pw.println("----------------------------------------");
            pw.println("Exception occurred while taking thread dump:");
            e.printStackTrace(pw);
            pw.println("----------------------------------------");
        }

        return sw.toString();
    }
}

How to generate a thread dump that looks similar to what you get from JVisualVM?

3 Answers3