code: @Override
  	public void store(final Writer writer, final String comments) throws IOException {
  		lock.readLock().lock();
  		try {
  			properties.store(writer, comments);
  		} finally {
  			lock.readLock().unlock();
  		}
  	}
docs: /*
  (non-Javadoc)
  
  @see java.util.Properties#store(java.io.Writer, java.lang.String)