import java.nio.ByteBuffer;
 import java.util.Date;
 import sun.misc.VM;
 
 public class DirectByteBufferExample {
 
     private static volatile long maxMemory = VM.maxDirectMemory();
 
     public static void main (String [] args)
             throws Exception {
         System.out.println("System classpath "+System.getProperty("java.class.path"));
         System.out.println("Direct Memory Size "+ VM.maxDirectMemory() +" "+maxMemory);
         int COUNT = 32;
         long startTime = new Date().getTime();
         if (args.length > 0) {
           System.out.println("Creating 1 GB memory which will be released if GCed");
           ByteBuffer buffer = null;
           for (int i = 0; i < COUNT; i++) {
              try {
                buffer = ByteBuffer.allocateDirect(1 * 1024 * 1024 * 1024);
              } catch(OutOfMemoryError e) {
                if (args.length > 1) {
                  try {
                     Thread.sleep(100);
                  } catch (InterruptedException x) {
                    Thread.currentThread().interrupt();
                  }
                  continue;
                } else
                  throw(e);
              }
              System.out.println("Direct Memory Size "+ VM.maxDirectMemory() +" "+maxMemory);
           }
         }
 
         long endTime = new Date().getTime();
         System.out.println("");
         System.out.println("Time taken (millis): " + (endTime - startTime));
     }
 }