code: public String[] getArray(final String key) {
  		final String value = getProperty(key);
  		if (value != null) {
  			final String[] strings = value.split(",[\\s]*|[\\s]*$");
  			return strings;
  		}
  		return null;
  	}
docs: Gets the prefixed key and parse it to an String[]<br>
  Each comma-separated list can be used.
  
  @param key
  the key
  
  @return String[] or null if the key couldn't get found.