code: public static boolean booleanValue(Class<?> clazz, String key, boolean defaultValue) {
  		return booleanValue(clazz.getName() + key, defaultValue);
  	}
docs: Gets a {@code boolean} system property value.
  
  @param clazz the {@linkplain Class} to derive the property key from.
  @param key the system property key (relative to the submitted {@linkplain Class}) to get.
  @param defaultValue The default value to return in case the property is not defined.
  @return The property value or the submitted default value if the property is not defined.