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

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

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.

$ 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

To avoid setting JAVA_HOME env var before launching

Perhaps using javax.tools.ToolProvider.getSystemToolClassLoader() http://docs.oracle.com/javase/7/docs/api/javax/tools/ToolProvider.html#getSystemToolClassLoader()

objc[56636]: Class JavaLaunchHelper is implemented in both /Library/Java/JavaVirtualMachines/jdk1.8.0_73.jdk/Contents/Home/bin/java (0x10b6864c0) and /Library/Java/JavaVirtualMachines/jdk1.8.0_73.jdk/Contents/Home/jre/lib/libinstrument.dylib (0x11333f4e0). One of the two will be used. Which one is undefined.

Dear ajermakovics,

I get a "IndexOutOfBoundsException: Index: 0, Size: 0" on running jvm-mon-0.3/bin/jvm-mon.

./jvm-mon-0.3/bin/jvm-mon OpenJDK 64-Bit Server VM warning: You have loaded library /tmp/java-monitoring/jvm-mon-0.3/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 ', or link it with '-z noexecstack'. Exception in thread "main" java.lang.IndexOutOfBoundsException: Index: 0, Size: 0 at java.util.ArrayList.rangeCheck(ArrayList.java:653) at java.util.ArrayList.get(ArrayList.java:429) at JvmMon.(JvmMon.java:46) at JvmMon.main(JvmMon.java:27)

My Env

cat /etc/*-release PRETTY_NAME="Debian GNU/Linux 8 (jessie)" NAME="Debian GNU/Linux" VERSION_ID="8" VERSION="8 (jessie)" ID=debian

java -version openjdk version "1.8.0_121" OpenJDK Runtime Environment (build 1.8.0_121-8u121-b13-1~bpo8+1-b13) OpenJDK 64-Bit Server VM (build 25.121-b13, mixed mode)

echo $JAVA_HOME /usr/lib/jvm/java-8-openjdk-amd64

Could you help?

best regards

Hey,

I downloaded your tar, extracted it, did the configuration for Java, and when I executed jvm-mon, here is the error I got :

OpenJDK 64-Bit Server VM warning: You have loaded library /home/tristan/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'.

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

Hi, during the startup I get the "You have loaded library...." message, then my console is cleared and nothing is shown.

When I CTRL-C, my console is not usable, since there is only 1 line available. On the screenshot there is an OLD line written, then Enter, then NEW written:

Any ideas? I work on Windows, using Cygwin consoles managed by ConEmu 64

Possible hint: I got I working the first time! But since then never again...

Currently j2v8 extracts it's native library (libj2v8_linux_x86_64.so) to users home directory. Should look into extracting it somewhere else, ideally project directory

(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.

• [email protected]
• [email protected] updated 2 packages in 1.022s

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 =

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.

This maybe a little weird but it's really happening and I don't realize why.

Just launching bin/jvm-mon with:

• jvm-mon version 0.3
• java version "1.8.0_171" Java(TM) SE Runtime Environment (build 1.8.0_171-b11) Java HotSpot(TM) 64-Bit Server VM (build 25.171-b11, mixed mode)
• Linux localhost 3.13.0-24-generic #46-Ubuntu SMP Thu Apr 10 19:11:08 UTC 2014 x86_64 x86_64 x86_64 GNU/Linux
• Ubuntu 14.04 LTS

java.rmi.ConnectIOException: Exception creating connection to: 192.168.0.150; nested exception is:
	java.net.NoRouteToHostException: No route to host (Host unreachable)
	at sun.rmi.transport.tcp.TCPEndpoint.newSocket(TCPEndpoint.java:631)
	at sun.rmi.transport.tcp.TCPChannel.createConnection(TCPChannel.java:216)
	at sun.rmi.transport.tcp.TCPChannel.newConnection(TCPChannel.java:202)
	at sun.rmi.server.UnicastRef.invoke(UnicastRef.java:129)
	at java.rmi.server.RemoteObjectInvocationHandler.invokeRemoteMethod(RemoteObjectInvocationHandler.java:227)
	at java.rmi.server.RemoteObjectInvocationHandler.invoke(RemoteObjectInvocationHandler.java:179)
	at com.sun.proxy.$Proxy0.newClient(Unknown Source)
	at javax.management.remote.rmi.RMIConnector.getConnection(RMIConnector.java:2430)
	at javax.management.remote.rmi.RMIConnector.connect(RMIConnector.java:308)
	at javax.management.remote.JMXConnectorFactory.connect(JMXConnectorFactory.java:270)
	at javax.management.remote.JMXConnectorFactory.connect(JMXConnectorFactory.java:229)
	at com.jvmtop.openjdk.tools.ProxyClient.tryConnect(ProxyClient.java:392)
	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.update(JvmMon.java:50)
	at JvmMon.<init>(JvmMon.java:45)
	at JvmMon.main(JvmMon.java:27)
Caused by: java.net.NoRouteToHostException: No route to host (Host unreachable)
	at java.net.PlainSocketImpl.socketConnect(Native Method)
	at java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:350)
	at java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:206)
	at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:188)
	at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:392)
	at java.net.Socket.connect(Socket.java:589)
	at java.net.Socket.connect(Socket.java:538)
	at java.net.Socket.<init>(Socket.java:434)
	at java.net.Socket.<init>(Socket.java:211)
	at sun.rmi.transport.proxy.RMIDirectSocketFactory.createSocket(RMIDirectSocketFactory.java:40)
	at sun.rmi.transport.proxy.RMIMasterSocketFactory.createSocket(RMIMasterSocketFactory.java:148)
	at sun.rmi.transport.tcp.TCPEndpoint.newSocket(TCPEndpoint.java:613)
	... 18 more

Interfaces Ip addr:

ip a
1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN group default
    link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
    inet 127.0.0.1/8 scope host lo
       valid_lft forever preferred_lft forever
    inet6 ::1/128 scope host
       valid_lft forever preferred_lft forever
2: em1: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc mq state UP group default qlen 1000
    link/ether f4:03:43:57:41:6c brd ff:ff:ff:ff:ff:ff
    inet 192.168.0.200/24 brd 192.168.0.255 scope global em1
       valid_lft forever preferred_lft forever
    inet6 fe80::f603:43ff:fe57:416c/64 scope link
       valid_lft forever preferred_lft forever
3: em2: <BROADCAST,MULTICAST> mtu 1500 qdisc noop state DOWN group default qlen 1000
    link/ether f4:03:43:57:41:6d brd ff:ff:ff:ff:ff:ff
4: em3: <BROADCAST,MULTICAST> mtu 1500 qdisc noop state DOWN group default qlen 1000
    link/ether f4:03:43:57:41:6e brd ff:ff:ff:ff:ff:ff
5: em4: <BROADCAST,MULTICAST> mtu 1500 qdisc noop state DOWN group default qlen 1000
    link/ether f4:03:43:57:41:6f brd ff:ff:ff:ff:ff:ff

Kernel IP routing table

Kernel IP routing table
Destination     Gateway         Genmask         Flags   MSS Window  irtt Iface
0.0.0.0         192.168.0.1     0.0.0.0         UG        0 0          0 em1
192.168.0.0     0.0.0.0         255.255.255.0   U         0 0          0 em1