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Console-based JVM monitoring tool

jvm-mon Console based JVM monitoring - when you just want to SSH into a server and see what's going on. jvm-top lets you monitor your JVM server applications from the terminal. New Version Release: 1.0-ea1
Information
Category: Java / Performance analysis
Watchers: 59
Star: 1.5k
Fork: 121
Last update: Sep 15, 2023
Resource links
https://github.com/ajermakovics/jvm-mon

Tests Homebrew Release

jvm-mon

Console based JVM monitoring - when you just want to SSH into a server and see what's going on.

jvm-top lets you monitor your JVM server applications from the terminal.

Screenshot

New Version

Release: 1.0-ea1

  • Rewritten in Go
  • Single executable file
  • Can monitor applications on Java 8 and above
  • Does not require an existing JDK

How it works:

  • jvm-mon executable comes bundled with a Java agent jar
  • On startup it extracts the agent to a temp directory
  • It attaches to the JVM you want to monitor
  • Loads agent into running JVM to collect metrics
  • Agent and app establish a socket connection to send metrics

Install

Requirement: a JDK8 on the server and JAVA_HOME environment variable pointing to it. It won't work with just a JRE.

MacOS

brew install jvm-mon

Linux/MacOS

  1. Download the release and extract
  2. Set JAVA_HOME environment variable: export JAVA_HOME=/path/to/your/jdk8
  3. Execute ./bin/jvm-mon from extracted directory

Usage

  • Select a JVM process and press Enter to monitor it
  • Press q or Ctrl+C to exit
  • Press Del or Backspace to kill a process

What is available

Currently it shows:

  • List of running JVM processes
  • Cpu and GC load
  • Heap size and usage
  • Top threads with cpu usage

Building from source

To build locally run ./gradlew installDist. Then go to ./build/install/jvm-mon/ and run ./bin/jvm-mon.

To develop you will need npm on your machine and then run ./gradlew npmDeps once to get dependencies.

How does it work?

jvm-mon is a Kotlin application based on these awesome libraries:

  • blessed-contrib terminal dashboard library in JavaScript
  • J2V8 Java Bindings for V8 JavaScript engine and Node.js
  • jvmtop Java monitoring for the command-line

The way it works is:

  1. The Kotlin app starts a Node.js engine in-process
  2. Node.js loads a script with all the widgets
  3. The script calls back into Kotlin to get metrics
17 Open More issues
Closed

UnsatisfiedLinkError: Could not load J2V8 library. Reasons: no j2v8_linux_x86_64 in java.library.path

Executing from a VM, unzipped package, CentOS 6

Java HotSpot(TM) 64-Bit Server VM warning: You have loaded library /home/rss/libj2v8_linux_x86_64.so which might have disabled stack guard. The VM will try to fix the stack guard now.
It's highly recommended that you fix the library with 'execstack -c <libfile>', or link it with '-z noexecstack'.
Exception in thread "main" java.lang.ExceptionInInitializerError
Caused by: java.lang.IllegalStateException: J2V8 native library not loaded
	at com.eclipsesource.v8.V8.checkNativeLibraryLoaded(V8.java:195)
	at com.eclipsesource.v8.V8.createV8Runtime(V8.java:149)
	at com.eclipsesource.v8.V8.createV8Runtime(V8.java:125)
	at com.eclipsesource.v8.NodeJS.createNodeJS(NodeJS.java:58)
	at com.eclipsesource.v8.NodeJS.createNodeJS(NodeJS.java:45)
	at JvmMon.<clinit>(JvmMon.java:12)
Caused by: java.lang.UnsatisfiedLinkError: Could not load J2V8 library. Reasons:
	no j2v8_linux_x86_64 in java.library.path
	/home/rss/libj2v8_linux_x86_64.so: /usr/lib64/libstdc++.so.6: version `GLIBCXX_3.4.15' not found (required by /home/rss/libj2v8_linux_x86_64.so)

	at com.eclipsesource.v8.LibraryLoader.loadLibrary(LibraryLoader.java:75)
	at com.eclipsesource.v8.V8.load(V8.java:71)
	at com.eclipsesource.v8.V8.createV8Runtime(V8.java:145)
	... 4 more
opened Feb 7, 2017 by trumpetx 10
Closed

Make available through homebrew

Would be great if it would be possible to distribute it using homebrew

opened Feb 7, 2017 by johanhaleby 9
Closed

ClassNotFoundException on MacOS/Java 8

When I try to run a build of HEAD, I get the following:

$ bin/jvm-mon
Exception in thread "main" java.lang.NoClassDefFoundError: sun/jvmstat/monitor/MonitorException
	at com.jvmtop.view.VMOverviewView.scanForNewVMs(VMOverviewView.java:157)
	at JvmMon.update(JvmMon.java:38)
	at JvmMon.main(JvmMon.java:22)
Caused by: java.lang.ClassNotFoundException: sun.jvmstat.monitor.MonitorException
	at java.net.URLClassLoader.findClass(URLClassLoader.java:381)
	at java.lang.ClassLoader.loadClass(ClassLoader.java:424)
	at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:331)
	at java.lang.ClassLoader.loadClass(ClassLoader.java:357)
	... 3 more

$ java -version
java version "1.8.0_91"
Java(TM) SE Runtime Environment (build 1.8.0_91-b14)
Java HotSpot(TM) 64-Bit Server VM (build 25.91-b14, mixed mode)

$ uname -a
Darwin somehost.local 15.6.0 Darwin Kernel Version 15.6.0: Mon Jan  9 23:07:29 PST 2017; root:xnu-3248.60.11.2.1~1/RELEASE_X86_64 x86_64
opened Feb 7, 2017 by fs111 6
Closed

Package using capsule

To produce a single executable jar http://www.capsule.io

or maybe Packr https://github.com/libgdx/packr

opened Feb 7, 2017 by ajermakovics 6
Closed

Display Java processes being run by other users on a box

I like the idea of jvm-mon, but it would be really useful if it displayed/monitored all the java processes running on a box (irrespective of user). If I run jvm-mon as root on my machine (Fedora 23) I would expect to be able to see all java processes running (they are available via jps), but this isn't the case.

opened Feb 7, 2017 by tom-smalls 5
Closed

Doesn't work when not run from within the exploded zip/tar 

$ opt/jvm-mon-0.1/bin/jvm-mon
objc[39393]: Class JavaLaunchHelper is implemented in both /Users/dnw/.jenv/versions/1.8/bin/java and /Library/Java/JavaVirtualMachines/jdk1.8.0_112.jdk/Contents/Home/jre/lib/libinstrument.dylib. One of the two will be used. Which one is undefined.

node.js:376
        callback();
        ^
module.js:341: Error: Cannot find module '/Users/dnw/opt/jvm-mon-0.1/bin/src/dist/jvm-mon.js'

$ cd opt/jvm-mon-0.1
$ bin/jvm-mon
objc[39418]: Class JavaLaunchHelper is implemented in both /Users/dnw/.jenv/versions/1.8/bin/java and /Library/Java/JavaVirtualMachines/jdk1.8.0_112.jdk/Contents/Home/jre/lib/libinstrument.dylib. One of the two will be used. Which one is undefined.~
$ # that worked
opened Feb 7, 2017 by dwijnand 4
Open

SyntaxError: Unexpected token =

(base) ➜ jvm-mon git:(master) ✗ ./gradlew npmDeps

Task :npmDeps npm WARN saveError ENOENT: no such file or directory, open '/Users/develop/jvm-mon/package.json' npm notice created a lockfile as package-lock.json. You should commit this file. npm WARN enoent ENOENT: no such file or directory, open '/Users/develop/jvm-mon/package.json' npm WARN jvm-mon No description npm WARN jvm-mon No repository field. npm WARN jvm-mon No README data npm WARN jvm-mon No license field.

3 packages are looking for funding run npm fund for details

BUILD SUCCESSFUL in 2s 1 actionable task: 1 executed (base) ➜ jvm-mon git:(master) ✗ ./build/install/jvm-mon/bin/jvm-mon java.io.IOException: Management agent not found at com.jvmtop.openjdk.tools.LocalVirtualMachine.loadManagementAgent(LocalVirtualMachine.java:365) at com.jvmtop.openjdk.tools.LocalVirtualMachine.startManagementAgent(LocalVirtualMachine.java:141) at com.jvmtop.openjdk.tools.ProxyClient.tryConnect(ProxyClient.java:372) at com.jvmtop.openjdk.tools.ProxyClient.connect(ProxyClient.java:354) at com.jvmtop.monitor.VMInfo.attachToVM(VMInfo.java:219) at com.jvmtop.monitor.VMInfo.processNewVM(VMInfo.java:186) at com.jvmtop.view.VMOverviewView.scanForNewVMs(VMOverviewView.java:176) at jvmmon.JvmStats.update(JvmStats.kt:32) at jvmmon.JvmStats.update$default(JvmStats.kt:31) at jvmmon.JvmStats.(JvmStats.kt:15) at JvmMon.(JvmMon.kt:12) at JvmMon$Companion.main(JvmMon.kt:28) at JvmMon.main(JvmMon.kt) java.io.IOException: Management agent not found at com.jvmtop.openjdk.tools.LocalVirtualMachine.loadManagementAgent(LocalVirtualMachine.java:365) at com.jvmtop.openjdk.tools.LocalVirtualMachine.startManagementAgent(LocalVirtualMachine.java:141) at com.jvmtop.openjdk.tools.ProxyClient.tryConnect(ProxyClient.java:372) at com.jvmtop.openjdk.tools.ProxyClient.connect(ProxyClient.java:354) at com.jvmtop.monitor.VMInfo.attachToVM(VMInfo.java:219) at com.jvmtop.monitor.VMInfo.processNewVM(VMInfo.java:186) at com.jvmtop.view.VMOverviewView.scanForNewVMs(VMOverviewView.java:176) at jvmmon.JvmStats.update(JvmStats.kt:32) at jvmmon.JvmStats.update$default(JvmStats.kt:31) at jvmmon.JvmStats.(JvmStats.kt:15) at JvmMon.(JvmMon.kt:12) at JvmMon$Companion.main(JvmMon.kt:28) at JvmMon.main(JvmMon.kt) java.io.IOException: Management agent not found at com.jvmtop.openjdk.tools.LocalVirtualMachine.loadManagementAgent(LocalVirtualMachine.java:365) at com.jvmtop.openjdk.tools.LocalVirtualMachine.startManagementAgent(LocalVirtualMachine.java:141) at com.jvmtop.openjdk.tools.ProxyClient.tryConnect(ProxyClient.java:372) at com.jvmtop.openjdk.tools.ProxyClient.connect(ProxyClient.java:354) at com.jvmtop.monitor.VMInfo.attachToVM(VMInfo.java:219) at com.jvmtop.monitor.VMInfo.processNewVM(VMInfo.java:186) at com.jvmtop.view.VMOverviewView.scanForNewVMs(VMOverviewView.java:176) at jvmmon.JvmStats.update(JvmStats.kt:32) at jvmmon.JvmStats.update$default(JvmStats.kt:31) at jvmmon.JvmStats.(JvmStats.kt:15) at JvmMon.(JvmMon.kt:12) at JvmMon$Companion.main(JvmMon.kt:28) at JvmMon.main(JvmMon.kt)

node.js:376 callback(); ^ /Users/develop/jvm-mon/build/install/jvm-mon/node_modules/marked-terminal/index.cjs:23: SyntaxError: Unexpected token = (base) ➜ jvm-mon git:(master) ✗ SyntaxError: Unexpected token =

opened Aug 20, 2022 by p-moon 0
Open

Chart stops updating after running for a long time

Once memory and cpu chart reaches end it stops updating.

Workaround: switch to another process and back

bug 
opened May 13, 2020 by ajermakovics 0
Open

Refresh list of JVMs

So that newly started processes also appear in the list and exited processes disappear. Atm it only shows processes that were already running.

opened May 13, 2020 by ajermakovics 0
Open

Calculating values for heap usage for plotting the graph

How can I get plotted values of heap usage graph in text file ( possibly comma separated ) ? Also, I couldn't understand how exactly are you getting/calculating those values for plotting ? Can you please tell this approach, that would be more beneficial for me. Thanks in advance, means a lot.

opened May 1, 2020 by ReasonablyAnon 3
Open

Calculate GC usage

In the new Go version

opened Apr 30, 2020 by ajermakovics 0
Open

Try with Termdash

https://github.com/mum4k/termdash

It has some nice features like zooming into a chart.

opened Apr 30, 2020 by ajermakovics 0

Contents

    tianshiyeben Linux performance monitoring system
    uber-common JVM Profiler Sending Metrics to Kafka, Console Output or Custom Reporter
    paulmillr Browser console methods polyfill.
    aragozin Small set of tools for JVM troublshooting, monitoring and profiling.
    EyeOfRa Windows Console Monitoring
    cucumber Cucumber for the JVM
    deephacks A curated list of awesome loosely performance related JVM stuff. Inspired by awesome-python.
    barosl jvm-monitor is a lightweight monitoring tool that logs all the local variables whenever exceptions occur.
    nunomaduro ✅ Laravel Console Task is a output method for Laravel Console Commands.
    mayuki Micro-framework for .NET Core console application. Cocona makes it easy and fast to build console applications on .NET Core.
    zkonge Another Mirai console wrapper
    patik Clear console logging for every browser
    scouter-project Scouter is an open source APM (Application Performance Management) tool.
    wgliang Golang application performance data monitoring.
    puniverse Dead-Simple Packaging and Deployment for JVM Apps
    pravj :chart_with_upwards_trend: HTTP log monitoring console for Humans
    deeplearning4j Fast, Scientific and Numerical Computing for the JVM (NDArrays)
    spring-projects Java agent that enables class reloading in a running JVM
    jruby JRuby, an implementation of Ruby on the JVM
    cretz Compile WebAssembly to JVM and other WASM tools
    plasma-umass Breaks the browser language barrier (includes a plugin-free JVM).
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