code: public boolean getBoolean(final String key, final boolean def) {
  		final String value = getProperty(key);
  		return value != null ? Boolean.valueOf(value).booleanValue() : def;
  	}
docs: Gets the prefixed key and parse it to an boolean-value.
  
  @param key
  key value
  @param def
  default value
  
  @return boolean-representation of value