public void appendFileInTarArchive(String tarPath, String tarFileName, String file2WriteName, String file2WriteContent) throws AuthenticationException, IOException {

    if (tarPath == null || tarFileName == null || tarFileName.isEmpty()) {

        LOG.warn("The path or the name of the tar archive is null or empty.");

        return;

    }

    final File tarFile = new File(tarPath, tarFileName);

    final File fileToAdd = new File(tarPath, file2WriteName);

    FileUtils.write(fileToAdd, file2WriteContent);

    if (file2WriteName == null || file2WriteName.isEmpty()) {

        LOG.warn("The name of the file to append in the archive is null or empty.");

        return;

    }

    ArchiveStreamFactory asf = new ArchiveStreamFactory();

    File tempFile = new File(tarPath, "tmpTar.tar");

    tempFile.createNewFile();

    try {

        FileInputStream fis = new FileInputStream(tarFile);

        ArchiveInputStream ais = asf.createArchiveInputStream(ArchiveStreamFactory.TAR, fis);

        FileOutputStream fos = new FileOutputStream(tempFile);

        ArchiveOutputStream aos = asf.createArchiveOutputStream(ArchiveStreamFactory.TAR, fos);

        // copy the existing entries

        ArchiveEntry nextEntry;

        while ((nextEntry = ais.getNextEntry()) != null) {

            aos.putArchiveEntry(nextEntry);

            IOUtils.copy(ais, aos);

            aos.closeArchiveEntry();

        }

        // create the new entry

        TarArchiveEntry entry = new TarArchiveEntry(file2WriteName);

        entry.setSize(fileToAdd.length());

        aos.putArchiveEntry(entry);

        IOUtils.copy(new FileInputStream(fileToAdd), aos);

        aos.closeArchiveEntry();

        aos.finish();

        ais.close();

        aos.close();

        // copies the new file over the old

        tarFile.delete();

        tempFile.renameTo(tarFile);

    } catch (ArchiveException e) {

        LOG.error(e.getMessage(), e);

    } catch (IOException e) {

        LOG.error(e.getMessage(), e);

    } finally {

        FileUtils.deleteQuietly(fileToAdd);

    }

}