code: public boolean getBoolean(String category, String key) {
  		String value = this.getProperty(category, key);
  		return Boolean.parseBoolean(value) || "on".equalsIgnoreCase(value);
  	}
docs: Same as {@link Configuration#getProperty(String, String)}, but a boolean is parsed.
  
  @param category The category of the property
  @param key      The key (identifier) of the property
  @return {@code true} if the property can be parsed to boolean, or equals (ignoring case) {@code "on"}