J2ee-threads running in tomcat server

Question

How to find the number of threads running in tomcat server?

please if anybody knows the answer tell.

http://stackoverflow.com/questions/2209687/find-out-the-number-of-connections-to-tomcat-server — Kamlesh Arya, Feb 05 '14 at 07:42
Answers become so much simpler if you ask your search engine how to do it using -Java-. — Gimby, Feb 05 '14 at 08:40

score 1 · Answer 1 · answered Feb 05 '14 at 07:43

Use jconsole <process-id> to attach the profiler to your tomcat and it will show minute level details of threads and memory.

jps command will show all the java processes that are running. Find the process id for tomcat and provide that in jconsole

JConsole

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PbxMan · Answer 2 · 2014-02-12T10:45:36.090

I normally upload a simple JSP to display info when I cannot use JConsole or VVM In this web you can find some JSP examples to do this. I normally use this one:

<%@ page language="java" contentType="text/html; charset=UTF-8"
    pageEncoding="UTF-8"%>
<%@ page import="java.io.PrintStream,
                 java.lang.management.ManagementFactory,
                 java.lang.management.ThreadInfo,
                 java.lang.management.ThreadMXBean"%>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<title>Quick and Dirty JSP Thread Report</title>
</head>
<body>
<%!
private static ThreadMXBean thMxBean = 
ManagementFactory.getThreadMXBean();
private static String getTaskName(long id, String name) {
    if (name == null) {
        return Long.toString(id);
    }
    return id + " (" + name + ")<br>";
}
%><%
final int STACK_DEPTH = 20;
boolean contention = thMxBean.isThreadContentionMonitoringEnabled();
long[] threadIds = thMxBean.getAllThreadIds();

out.println("Process Thread Dump: <br/>");
out.println(threadIds.length + " active threads<br/>");
for (long tid : threadIds) {
    ThreadInfo info = thMxBean.getThreadInfo(tid, STACK_DEPTH);
    if (info == null) {
        out.println("  Inactive");
        continue;
    }
    out.println(" <br/><br/>Thread "
            + getTaskName(info.getThreadId(), info.getThreadName()));
    Thread.State state = info.getThreadState();
    out.println("  State: " + state);
    out.println("  <br/>Blocked count: " + info.getBlockedCount());
    out.println("  <br/>Waited count: " + info.getWaitedCount());
    if (contention) {
        out.println("  <br/>Blocked time: " + info.getBlockedTime());
        out.println(" <br/> Waited time: " + info.getWaitedTime());
    }
    if (state == Thread.State.WAITING) {
        out.println("  Waiting on " + info.getLockName());
    } else if (state == Thread.State.BLOCKED) {
        out.println("  Blocked on " + info.getLockName());
        out.println("  Blocked by <br/>"
                + getTaskName(info.getLockOwnerId(),
                        info.getLockOwnerName()));
    }
    out.println("  <br/>Stack: ");
    for (StackTraceElement frame : info.getStackTrace()) {
        out.println("    " + frame.toString());
    }
}%>

I hope this helps.

J2ee-threads running in tomcat server

2 Answers2