get rss (resident set size) memory using java

PrintRssMemory.java

package com.github.diegolovison;

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.lang.management.ManagementFactory;

public class PrintRssMemory {

   public static void main(String[] args) throws IOException {

      System.out.println(getRss());
   }

   private static Long getRss() throws IOException {

      String command = "ps --no-headers -o rss " + getCurrentPid();

      ProcessBuilder builder = new ProcessBuilder().command("bash", "-c", command);

      Process process = builder.start();

      return Long.valueOf(new BufferedReader(new InputStreamReader(process.getInputStream())).readLine());

   }

   // java9: long pid = ProcessHandle.current().pid();
   public static synchronized long getCurrentPid() {

      return Long.valueOf(ManagementFactory.getRuntimeMXBean().getName().split("@")[0]);
   }
}