code: private static URL findLibraryResource(final String libraryFileName) {
      String osName = System.getProperty("os.name").toLowerCase();
      String osArch = System.getProperty("os.arch").toLowerCase();
      String resourceName = null;
  
      LOG.trace("Load library \"{}\" for os {}:{}", libraryFileName, osName, osArch);
  
      if (osName.startsWith(OS_WIN)) {
        resourceName = determineWindowsLibrary(libraryFileName, osName, osArch);
      } else if (osName.startsWith(OS_LINUX)) {
        resourceName = determineLinuxLibrary(libraryFileName, osName, osArch);
      } else if (osName.startsWith(OS_FREEBSD)) {
        resourceName = determineFreebsdLibrary(libraryFileName, osName, osArch);
      } else if (osName.startsWith(OS_MAC)) {
        resourceName = determineMacLibrary(libraryFileName);
      } else {
        unsupportedPlatform(osName, osArch);
      }
  
      URL resource = NativeLoader.class.getResource(resourceName);
  
      if (null == resource) {
        unsupportedPlatform(osName, osArch, resourceName);
      }
  
      return resource;
    }
docs: Find the right shared library, depending on the operating system and architecture.
  
  @throws UnsupportedOperationException Throw an exception if no native library for this platform
  was found.