code: private List<File> unTar(final File inputFile, final File outputDir) throws FileNotFoundException, IOException, ArchiveException {
  
  	    _log.info(String.format("Untaring %s to dir %s.", inputFile.getAbsolutePath(), outputDir.getAbsolutePath()));
  
  	    final List<File> untaredFiles = new LinkedList<File>();
  	    final InputStream is = new FileInputStream(inputFile); 
  	    final TarArchiveInputStream debInputStream = (TarArchiveInputStream) new ArchiveStreamFactory().createArchiveInputStream("tar", is);
  	    TarArchiveEntry entry = null; 
  	    while ((entry = (TarArchiveEntry)debInputStream.getNextEntry()) != null) {
  	        final File outputFile = new File(outputDir, entry.getName());
  	        if (entry.isDirectory()) {
  	            _log.info(String.format("Attempting to write output directory %s.", outputFile.getAbsolutePath()));
  	            if (!outputFile.exists()) {
  	                _log.info(String.format("Attempting to create output directory %s.", outputFile.getAbsolutePath()));
  	                if (!outputFile.mkdirs()) {
  	                    throw new IllegalStateException(String.format("Couldn't create directory %s.", outputFile.getAbsolutePath()));
  	                }
  	            }
  	        } else {
  	            _log.info(String.format("Creating output file %s.", outputFile.getAbsolutePath()));
  	            final OutputStream outputFileStream = new FileOutputStream(outputFile); 
  	            IOUtils.copy(debInputStream, outputFileStream);
  	            outputFileStream.close();
  	        }
  	        untaredFiles.add(outputFile);
  	    }
  	    debInputStream.close(); 
  
  	    return untaredFiles;
  	}
docs: Untar an input file into an output file.
  
  The output file is created in the output folder, having the same name
  as the input file, minus the '.tar' extension.
  
  @param inputFile     the input .tar file
  @param outputDir     the output directory file.
  @throws IOException
  @throws FileNotFoundException
  
  @return  The {@link List} of {@link File}s with the untared content.
  @throws ArchiveException