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import java.io.File;
import java.io.RandomAccessFile;
import java.lang.reflect.Method;
import java.nio.ByteBuffer;
import java.nio.MappedByteBuffer;
import java.nio.channels.FileChannel;
import java.nio.channels.FileChannel.MapMode;

import sun.nio.ch.FileChannelImpl;

public class TestDeleteMappedFile {
  

  public static void main(String args[]) {
    
    File f = new File("mapfile");
    RandomAccessFile aFile = null;
    FileChannel inChannel = null;
    try {
      aFile = new RandomAccessFile(f, "rw");
      aFile.setLength(0);
      inChannel = aFile.getChannel();
      ByteBuffer buf = inChannel.map(MapMode.READ_WRITE, 0L, 4);
      
      Method m = FileChannelImpl.class.getDeclaredMethod("unmap", MappedByteBuffer.class);
      m.setAccessible(true);
      m.invoke(FileChannelImpl.class, buf);
    } catch (Exception e) {
      e.printStackTrace();
      return;
    } finally {
      try {
        inChannel.close();
        aFile.close();
      } catch (Exception e) {
        e.printStackTrace();
      }
    }
    System.out.println("delete " + f + " res ==> " + f.delete());
  }

}