code: public static void pack(ZipEntrySource[] entries, OutputStream os) {
      if (log.isDebugEnabled()) {
        log.debug("Creating stream from {}.", Arrays.asList(entries));
      }
      pack(entries, os, false);
    }
docs: Compresses the given entries into an output stream.
  
  @param entries
  ZIP entries added.
  @param os
  output stream for the new ZIP (does not have to be buffered)
  
  @since 1.9