* Copyright (c) 2011, 2013 Oracle and/or its affiliates. All rights reserved.

import java.io.*;

    /**

     * Memory leak is assumed, if application consumes more than specified amount of memory during its execution.

     * The number is given in Kb.

     */

    private static final long MEM_LEAK_THRESHOLD = 32 * 1024; // 32Mb

        long vMemBefore = getVMemSize();

        long vMemAfter = getVMemSize();

        if (vMemBefore == 0 || vMemAfter == 0) {

            System.err.println("WARNING: Cannot perform memory leak detection on this OS");

        } else {

            long vMemDelta = vMemAfter - vMemBefore;

            if (vMemDelta > MEM_LEAK_THRESHOLD) {

                System.err.println("FAIL: Virtual memory usage increased by " + vMemDelta + "Kb " +

                        "(greater than " + MEM_LEAK_THRESHOLD + "Kb)");

                System.exit(1);

            }

            System.err.println("PASS: Virtual memory usage increased by " + vMemDelta + "Kb " +

                    "(not greater than " + MEM_LEAK_THRESHOLD + "Kb)");

        }

    /**

     * Return size of virtual memory allocated to the process in Kb.

     * Linux specific. On other platforms and in case of any errors return 0.

     */

    private static long getVMemSize() {

        // Refer to the Linux proc(5) man page for details about /proc/self/stat file

        //

        // In short, this file contains status information about the current process

        // written in one line. The fields are separated with spaces.

        // The 23rd field is defined as 'vsize %lu   Virtual memory size in bytes'

        try (FileReader fileReader = new FileReader("/proc/self/stat");

             BufferedReader bufferedReader = new BufferedReader(fileReader)) {

            String line = bufferedReader.readLine();

            return Long.parseLong(line.split(" ")[22]) / 1024;

        } catch (Exception ex) {}

        return 0;

    }