In current implementation of RamdomAccessFile.java, it seeks to the end of a file to get the file size, which brings different problems to windows and *nix platforms.

On windows:
When using FILE_FLAG_NO_BUFFERING to open a file, you cannot, in general, get the file size by doing a zero seek relative to FILE_END. The end of the file may not coincide with a sector boundary and trying to seek to a non-aligned position (even if you are just trying to find out what that position is) is illegal and will fail. The workaround is to use GetFileSizeEx instead.

On *nix:
It will throw IOException when checking /proc files. This is the same issue reported in jdk-7132461.

        RandomAccessFile raf = new RandomAccessFile("/proc/cpuinfo", "r");
        System.out.println("RF:" + raf.length());