import java.io.IOException;
import java.util.Optional;

public class ProcessUtils {
  private ProcessUtils() {}

  public static Optional getCommandOfCurrentProcess() {
     ProcessHandle processHandle = ProcessHandle.current();
     return processHandle.info().command();
  }

  public static void main(String[] args) throws IOException {
    System.out.println(ProcessUtils.getCommandOfCurrentProcess());
  }
}

/*
  output:

  Optional[C:\Dev\Java\jdk-9\bin\javaw.exe]

*/

package com.rgagnon.howto;

import java.io.BufferedReader;
import java.io.File;
import java.io.FileWriter;
import java.io.IOException;
import java.io.InputStreamReader;

public class JVMUtils {

  private JVMUtils() {}

  private static long getPID() {
    String processName =
      java.lang.management.ManagementFactory.getRuntimeMXBean().getName();
    return Long.parseLong(processName.split("@")[0]);
  }

  /**
   * @return the current JVM used by this process or null
   */
  public static String getJVMPath() {
    String path = "";
    BufferedReader input = null;
    try {
        File file = File.createTempFile("realhowto",".vbs");
        file.deleteOnExit();
        FileWriter fw = new java.io.FileWriter(file);

        String vbs = "Set WshShell = WScript.CreateObject(\"WScript.Shell\")\n"
                   + "Set locator = CreateObject(\"WbemScripting.SWbemLocator\")\n"
                   + "Set service = locator.ConnectServer()\n"
                   + "Set processes = service.ExecQuery _\n"
                   + " (\"select * from Win32_Process where ProcessId='"
                   + JVMUtils.getPID() +"'\")\n"
                   + "For Each process in processes\n"
                   + "wscript.echo process.ExecutablePath \n"
                   + "Next\n"
                   + "Set WSHShell = Nothing\n";
        fw.write(vbs);
        fw.close();
        Process p = Runtime.getRuntime().exec("cscript //NoLogo " + file.getPath());
        input =
            new BufferedReader
              (new InputStreamReader(p.getInputStream()));
        path = input.readLine();
    }
    catch(Exception e){
        e.printStackTrace();
        return null;
    }
    finally {
      try { if (input != null) { input.close(); }  }
      catch (IOException io) { io.printStackTrace(); return null; }
    }
    return path;
  }

  /**
   * @return the JVM used by the current process and its command line or null
   */
  public static String getJVMCommandLine() {
    String path = "";
    BufferedReader input = null;
    try {
        File file = File.createTempFile("realhowto",".vbs");
        file.deleteOnExit();
        FileWriter fw = new java.io.FileWriter(file);

        String vbs = "Set WshShell = WScript.CreateObject(\"WScript.Shell\")\n"
                   + "Set locator = CreateObject(\"WbemScripting.SWbemLocator\")\n"
                   + "Set service = locator.ConnectServer()\n"
                   + "Set processes = service.ExecQuery _\n"
                   + " (\"select * from Win32_Process where ProcessId='"
                   + JVMUtils.getPID() +"'\")\n"
                   + "For Each process in processes\n"
                   + "wscript.echo process.CommandLine \n"
                   + "Next\n"
                   + "Set WSHShell = Nothing\n";
        fw.write(vbs);
        fw.close();
        Process p = Runtime.getRuntime().exec("cscript //NoLogo " + file.getPath());
        input =
            new BufferedReader
              (new InputStreamReader(p.getInputStream()));
        path = input.readLine();
    }
    catch(Exception e){
        e.printStackTrace();
        return null;
    }
    finally {
      try { if (input != null) { input.close(); }  }
      catch (IOException io) { io.printStackTrace(); return null; }
    }
    return path;
  }


  public static void main(String[] args) {
    System.out.println(JVMUtils.getJVMPath());
    /*
    output (example):
    C:\Program Files (x86)\Java\jre6\bin\javaw.exe
    */
    System.out.println(JVMUtils.getJVMCommandLine());
    /*
     output (example):
     "C:\Program Files (x86)\Java\jre7\bin\javaw.exe" -Dfile.encoding=Cp1252 -classpath "C:\Applications\dev\eclipseworkspace\Howto\bin;" com.rgagnon.howto.JVMUtils
    */
  }
}