ReadableBytechannel.read always returns -1

I am using ReadableByteChannel to read from a file.

The code snippet is as below

   InputStream in = new FileInputStream("Copy.tiff");
   FileInputStream in1 = new FileInputStream("Copy.tiff");
   FileChannel inChannel = in1.getChannel();
   ReadableByteChannel srcChannel = null;
   srcChannel = Channels.newChannel(in);
   ByteBuffer buffer = ByteBuffer.allocate(1024);
   long pos1 = 0;
   buffer.rewind();
   pos1= srcChannel.read(buffer);//Here value is -1
   pos1 = inChannel.read(buffer);//Here some开发者_StackOverflow中文版 positive number

If I use InputStream read method always returns -1. If I use FileInputStream it returns a positive number. Googling did not provide any appropriate answer. Any feedback on what is going wrong.

I'm not able to reproduce this (on Windows). I get a positive value via both methods, and I don't see why it should fail. Maybe it's some awful implementation-dependent quirk.

FileChannel (as returned by FileInputStream.getChannel()) already implements ReadableByteChannel, so I wonder why you're creating one manually?

The following code works fine for me:

    ByteBuffer buffer = ByteBuffer.allocate(1024);
    InputStream in = new FileInputStream("Copy.tiff");
    ReadableByteChannel srcChannel = Channels.newChannel(in);
    long pos = srcChannel.read(buffer);
    System.out.println("Position in channel: " + pos);

ReadableByteChannel srcChannel = new FileInputStream("Copy.tiff).getChannel();