jcmd: VM.system_properties: Print VM system properties

jcmd provides ‘VM.system_properties’ command, it prints VM system properties.

For example,

HelloWorld.java

public class HelloWorld {
 public static void main(String args[]) throws Exception {
  Thread t1 = new Thread() {
   public void run() {
    while (true) {
     try {
      Thread.sleep(1000);
     } catch (Exception e) {

     }
    }
   }
  };

  t1.start();
 }
}

Compile and run HelloWorld.java application.

Open new terminal (or) command prompt and execute jcmd command.

C:\>jcmd
21744 HelloWorld
13220
19416 sun.tools.jcmd.JCmd

From the jcmd output, I confirm that HelloWorld application is running with process id 21744.

Execute the command 'jcmd 21744 help' to get list of available commands associated with process id 21744.

As you see above image 'VM.system_properties' command is available for the process id 21744.

Execute the command 'jcmd 21744 VM.system_properties' to get all the system properties used by this VM.

C:\>jcmd 21744 VM.system_properties
21744:
#Fri Jul 27 08:55:35 IST 2018
java.runtime.name=Java(TM) SE Runtime Environment
sun.boot.library.path=C\:\\Program Files\\Java\\jdk1.8.0_171\\jre\\bin
java.vm.version=25.171-b11
java.vm.vendor=Oracle Corporation
java.vendor.url=http\://java.oracle.com/
path.separator=;
java.vm.name=Java HotSpot(TM) 64-Bit Server VM
file.encoding.pkg=sun.io
user.script=
user.country=US
sun.java.launcher=SUN_STANDARD
sun.os.patch.level=
java.vm.specification.name=Java Virtual Machine Specification
user.dir=C\:\\Users\\krishna\\Documents\\Study\\Miscellaneous
java.runtime.version=1.8.0_171-b11
java.awt.graphicsenv=sun.awt.Win32GraphicsEnvironment
java.endorsed.dirs=C\:\\Program Files\\Java\\jdk1.8.0_171\\jre\\lib\\endorsed
os.arch=amd64
java.io.tmpdir=C\:\\Users\\krishna\\TEMP\\
line.separator=\r\n
java.vm.specification.vendor=Oracle Corporation
user.variant=
os.name=Windows 10
sun.jnu.encoding=Cp1252

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