#vulnerable code 
                             @Override
	public boolean isRetainOuputAsMessage(Message<?> message) {
		return message.getHeaders().containsKey(MessageUtils.MESSAGE_TYPE)
			&& message.getHeaders().get(MessageUtils.MESSAGE_TYPE).equals(CloudEventMessageUtils.CLOUDEVENT_VALUE);
	} 
                            #location 4 
                            #vulnerability type NULL_DEREFERENCE
#fixed code
                             @Override
	public boolean isRetainOuputAsMessage(Message<?> message) {
		return message.getHeaders().containsKey(MessageUtils.TARGET_PROTOCOL) || (message.getHeaders().containsKey(MessageUtils.MESSAGE_TYPE)
			&& message.getHeaders().get(MessageUtils.MESSAGE_TYPE).equals(CloudEventMessageUtils.CLOUDEVENT_VALUE));
	}