src/main/java/js/servlet/Server.java
private static String log(String message, Object... args) {
		message = String.format(message, args);
		java.util.logging.Logger.getLogger(Server.class.getCanonicalName()).log(java.util.logging.Level.SEVERE, message);
		return message;
	}
private static String log(String message, Object... args) {
		message = String.format(message, args);
		java.util.logging.Logger.getLogger(Server.class.getCanonicalName()).log(java.util.logging.Level.SEVERE, message);
		return message;
	}
Log formatted message to Java logger since framework logger is not yet initialized.

@param message message with optional formatting elements as supported by {@link String#format(String, Object...)},
@param args optional arguments.
@return formatted message.