#fixed code
                             @SuppressWarnings("unchecked")
	public static Message<?> toBinary(Message<?> inputMessage, MessageConverter messageConverter) {

		Map<String, Object> headers = inputMessage.getHeaders();
		CloudEventAttributes attributes = new CloudEventAttributes(headers);

		// first check the obvious and see if content-type is `cloudevents`
		if (!attributes.isValidCloudEvent() && headers.containsKey(MessageHeaders.CONTENT_TYPE)) {
			MimeType contentType = resolveContentType(inputMessage.getHeaders());
			if (contentType != null && contentType.getType().equals(CloudEventMessageUtils.APPLICATION_CLOUDEVENTS.getType())
					&& contentType.getSubtype().startsWith(CloudEventMessageUtils.APPLICATION_CLOUDEVENTS.getSubtype())) {

				String dataContentType = StringUtils.hasText(attributes.getDataContentType())
						? attributes.getDataContentType()
						: MimeTypeUtils.APPLICATION_JSON_VALUE;

				String suffix = contentType.getSubtypeSuffix();
				Assert.hasText(suffix, "Content-type 'suffix' can not be determined from " + contentType);
				MimeType cloudEventDeserializationContentType = MimeTypeUtils
						.parseMimeType(contentType.getType() + "/" + suffix);
				Message<?> cloudEventMessage = MessageBuilder.fromMessage(inputMessage)
						.setHeader(MessageHeaders.CONTENT_TYPE, cloudEventDeserializationContentType)
						.setHeader(CloudEventMessageUtils.CANONICAL_DATACONTENTTYPE, dataContentType)
						.build();
				Map<String, Object> structuredCloudEvent = (Map<String, Object>) messageConverter.fromMessage(cloudEventMessage, Map.class);
				Message<?> binaryCeMessage = buildCeMessageFromStructured(structuredCloudEvent, inputMessage.getHeaders());
				return binaryCeMessage;
			}
		}
		else if (StringUtils.hasText(attributes.getDataContentType())) {
			return MessageBuilder.fromMessage(inputMessage)
				.setHeader(MessageHeaders.CONTENT_TYPE, attributes.getDataContentType())
				.build();
		}
		return inputMessage;
	}
#vulnerable code 
                             @SuppressWarnings("unchecked")
	public static Message<?> toBinary(Message<?> inputMessage, MessageConverter messageConverter) {

		Map<String, Object> headers = inputMessage.getHeaders();
		CloudEventAttributes attributes = new CloudEventAttributes(headers);

		// first check the obvious and see if content-type is `cloudevents`
		if (!attributes.isValidCloudEvent() && headers.containsKey(MessageHeaders.CONTENT_TYPE)) {
			MimeType contentType = contentTypeResolver.resolve(inputMessage.getHeaders());
			if (contentType.getType().equals(CloudEventMessageUtils.APPLICATION_CLOUDEVENTS.getType())
					&& contentType.getSubtype().startsWith(CloudEventMessageUtils.APPLICATION_CLOUDEVENTS.getSubtype())) {

				String dataContentType = StringUtils.hasText(attributes.getDataContentType())
						? attributes.getDataContentType()
						: MimeTypeUtils.APPLICATION_JSON_VALUE;

				String suffix = contentType.getSubtypeSuffix();
				Assert.hasText(suffix, "Content-type 'suffix' can not be determined from " + contentType);
				MimeType cloudEventDeserializationContentType = MimeTypeUtils
						.parseMimeType(contentType.getType() + "/" + suffix);
				Message<?> cloudEventMessage = MessageBuilder.fromMessage(inputMessage)
						.setHeader(MessageHeaders.CONTENT_TYPE, cloudEventDeserializationContentType)
						.setHeader(CloudEventMessageUtils.CANONICAL_DATACONTENTTYPE, dataContentType)
						.build();
				Map<String, Object> structuredCloudEvent = (Map<String, Object>) messageConverter.fromMessage(cloudEventMessage, Map.class);
				Message<?> binaryCeMessage = buildCeMessageFromStructured(structuredCloudEvent, inputMessage.getHeaders());
				return binaryCeMessage;
			}
		}
		else if (StringUtils.hasText(attributes.getDataContentType())) {
			return MessageBuilder.fromMessage(inputMessage)
				.setHeader(MessageHeaders.CONTENT_TYPE, attributes.getDataContentType())
				.build();
		}
		return inputMessage;
	} 
                            #location 10 
                            #vulnerability type NULL_DEREFERENCE