ingrid.yao@Eng 2001-05-23

J2SE Version (please include all output from java -version flag):

   java version "1.4.0-beta"
   Java(TM) 2 Runtime Environment, Standard Edition (build 1.4.0-beta-b64)
   Java HotSpot(TM) Client VM (build 1.4.0-beta-b64, mixed mode)

Does this problem occur on J2SE 1.3? Yes / No (pick one)

   Feature Not exists

Operating System Configuration Information (be specific):

     Win 2000 5.00.2195 Service pack 1

Hardware Configuration Information (be specific):

    x86 Family 6 Model 7 Stepping 3

Bug Description:

    java.nio.MappedByteBuffer.isReadOnly() returns false, should be true

Test program
================

import java.nio.channels.FileChannel;
import java.nio.MappedByteBuffer;
import java.io.*;


public class readNIOSmap {

   public static void main(String[] args) throws Exception {
readNIOSmap();
   }

   private static void readNIOSmap() throws IOException {
     long startTime = System.currentTimeMillis();

     RandomAccessFile raf = new RandomAccessFile("testFile", "r");
     FileChannel channel = raf.getChannel();
     MappedByteBuffer buff = channel.map(FileChannel.MAP_RO, 0, (int) raf.length());
     buff.load();
     System.out.println(" read NIO map: "+ buff.isDirect()+" "+buff.isLoaded()+" "+ buff.isReadOnly());

     raf.close();

     long tookTime = System.currentTimeMillis() - startTime;
     System.out.println("Read NIO Stream mapped takes "+ (tookTime*.001) + " seconds");
   }
}