code: @SuppressWarnings("null")
  	public static String value(String key, String defaultValue) {
  		return System.getProperty(key, defaultValue);
  	}
docs: Gets a system property value.
  
  @param key the property key 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.