code: private static InputStreamReader decompressWithBZip2(
  			final String archivePath)
  		throws ConfigurationException
  	{
  
  		Bzip2Archiver archiver = new Bzip2Archiver();
  		InputStreamReader reader = null;
  		try {
  			reader = archiver.getDecompressionStream(archivePath, WIKIPEDIA_ENCODING);
  		}
  		catch (IOException e) {
  
  			e.printStackTrace();
  		}
  
  		return reader;
  	}
docs: Starts a decompression process using the BZip2 program.
  
  @param archivePath
  path to the archive
  @return InputStreamReader
  
  @throws ConfigurationException
  if an error occurred while accessing the configuration