jodd-core/src/main/java/jodd/exception/ExceptionUtil.java
public static String message(final Throwable throwable) {
		String message = throwable.getMessage();

		if (StringUtil.isBlank(message)) {
			message = throwable.toString();
		}

		return message;
	}
public static String message(final Throwable throwable) {
		String message = throwable.getMessage();

		if (StringUtil.isBlank(message)) {
			message = throwable.toString();
		}

		return message;
	}
Returns <code>non-null</code> message for a throwable.