code: protected void cleanUpArchiver( AbstractArchiver archiver )
      {
          try
          {
              Method cleanUpMethod = AbstractArchiver.class.getDeclaredMethod( "cleanUp" );
              cleanUpMethod.setAccessible( true );
              cleanUpMethod.invoke( archiver );
          }
          catch ( Exception e )
          {
              getLog().warn( "\"" + e.getMessage() + "\" exception while invoking AbstractArchiver.cleanUp() using reflection. Ignoring." );
          }
      }
docs: Hack to close input streams (cleanUp() method is protected)