Why am i getting an index out of bounds exception

Question

I just want to read some bytes at the end of an mp3 file.
File file = new File(fd.getDirectory() + File.separator + fd.getFile());
            try {
                 FileInputStream fileInputStream = new FileInputStream(file);
                 byte[] fileSnippet = new byte[100];
                 int startPosition = (int)file.length() - 500;
                 fileInputStream.read(fileSnippet, startPosition, 100);

Answer 1

fileInputStream.read(fileSnippet, startPosition, 100);This does not tell it to seek (hint, hint) to startPosition and read 100 bytes. It is telling it to read from the current position into the buffer starting at index "startPosition" in that buffer. If startPosition is >= 100, then that's clearly out of bounds.