NPE unmarshalling an event

I’m using Spring for REST and trying to unmarshall an event coming in with this code snippet:

@PostMapping(value = "/", consumes = MediaType.APPLICATION_JSON_VALUE)
    public ResponseEntity<Void> event(@RequestHeader Map<String, Object> headers,
            @RequestBody String body) {
        System.out.println("Receved request headers: " + headers);
        System.out.println("Received request body: " + body);
        if (MediaType.APPLICATION_JSON_VALUE.equalsIgnoreCase(headers.get("content-type").toString())) {
            @SuppressWarnings("rawtypes")
            CloudEvent<AttributesImpl, Map> cloudEvent = Unmarshallers.binary(Map.class)
                .withHeaders(() -> headers)
                .withPayload(() -> body)
                .unmarshal();
            System.out.println("Received CloudEvent: " + cloudEvent);
            //...
        }
        return ResponseEntity.accepted().build();
    }

I get these headers and body:

Receved request headers: {host=****, user-agent=Go-http-client/1.1, content-length=40, accept-encoding=gzip, ce-id=81063005-d897-4162-8a79-5224bdde4d81, ce-source=/apis/v1/namespaces/default/cronjobsources/test-cronjob-source, ce-specversion=0.3, ce-time=2019-10-08T12:56:00.000398275Z, ce-type=dev.knative.cronjob.event, content-type=application/json, forwarded=for=172.30.252.225;proto=http, for=127.0.0.1, k-proxy-request=activator, x-b3-parentspanid=08fdcef844c5b6e6, x-b3-sampled=0, x-b3-spanid=7d2298100968d43e, x-b3-traceid=ff56838a09c39d245ad334a89c91a0c8, x-envoy-decorator-operation=javaspringknativecloudant-vwv5h-nlf5f.default.svc.cluster.local:80/*, x-forwarded-for=172.30.252.225, 127.0.0.1, 172.30.233.147, x-forwarded-proto=http, x-istio-attributes=ClsKF2Rlc3RpbmF0aW9uLnNlcnZpY2UudWlkEkASPmlzdGlvOi8vZGVmYXVsdC9zZXJ2aWNlcy9qYXZhc3ByaW5na25hdGl2ZWNsb3VkYW50LXZ3djVoLW5sZjVmCl0KGGRlc3RpbmF0aW9uLnNlcnZpY2UuaG9zdBJBEj9qYXZhc3ByaW5na25hdGl2ZWNsb3VkYW50LXZ3djVoLW5sZjVmLmRlZmF1bHQuc3ZjLmNsdXN0ZXIubG9jYWwKQwoYZGVzdGluYXRpb24uc2VydmljZS5uYW1lEicSJWphdmFzcHJpbmdrbmF0aXZlY2xvdWRhbnQtdnd2NWgtbmxmNWYKKgodZGVzdGluYXRpb24uc2VydmljZS5uYW1lc3BhY2USCRIHZGVmYXVsdApHCgpzb3VyY2UudWlkEjkSN2t1YmVybmV0ZXM6Ly9hY3RpdmF0b3ItNzY1NDc1OTU0Ny00ZDd2bS5rbmF0aXZlLXNlcnZpbmc=, x-request-id=6041ed42-e2e0-46b5-b6eb-c5ff88120464}
Received request body: {"message":"Hello world! This is CRON!"}

And I get this NPE. Am I doing something wrong in my usage of the SDK?

java.lang.NullPointerException: null
	at sun.reflect.annotation.TypeAnnotationParser.mapTypeAnnotations(Unknown Source) ~[na:1.8.0]
	at sun.reflect.annotation.AnnotatedTypeFactory$AnnotatedTypeBaseImpl.<init>(Unknown Source) ~[na:1.8.0]
	at sun.reflect.annotation.AnnotatedTypeFactory.buildAnnotatedType(Unknown Source) ~[na:1.8.0]
	at sun.reflect.annotation.TypeAnnotationParser.buildAnnotatedType(Unknown Source) ~[na:1.8.0]
	at java.lang.reflect.Field.getAnnotatedType(Unknown Source) ~[na:1.8.0]
	at org.hibernate.validator.internal.metadata.provider.TypeAnnotationAwareMetaDataProvider.findTypeAnnotationConstraintsForMember(TypeAnnotationAwareMetaDataProvider.java:65) ~[hibernate-validator-5.3.6.Final.jar!/:5.3.6.Final]
	at org.hibernate.validator.internal.metadata.provider.AnnotationMetaDataProvider.findPropertyMetaData(AnnotationMetaDataProvider.java:244) ~[hibernate-validator-5.3.6.Final.jar!/:5.3.6.Final]
	at org.hibernate.validator.internal.metadata.provider.AnnotationMetaDataProvider.getFieldMetaData(AnnotationMetaDataProvider.java:227) ~[hibernate-validator-5.3.6.Final.jar!/:5.3.6.Final]
	at org.hibernate.validator.internal.metadata.provider.AnnotationMetaDataProvider.retrieveBeanConfiguration(AnnotationMetaDataProvider.java:137) ~[hibernate-validator-5.3.6.Final.jar!/:5.3.6.Final]
	at org.hibernate.validator.internal.metadata.provider.AnnotationMetaDataProvider.getBeanConfiguration(AnnotationMetaDataProvider.java:125) ~[hibernate-validator-5.3.6.Final.jar!/:5.3.6.Final]
	at org.hibernate.validator.internal.metadata.provider.AnnotationMetaDataProvider.getBeanConfigurationForHierarchy(AnnotationMetaDataProvider.java:108) ~[hibernate-validator-5.3.6.Final.jar!/:5.3.6.Final]
	at org.hibernate.validator.internal.metadata.BeanMetaDataManager.createBeanMetaData(BeanMetaDataManager.java:203) ~[hibernate-validator-5.3.6.Final.jar!/:5.3.6.Final]
	at org.hibernate.validator.internal.metadata.BeanMetaDataManager.getOrCreateBeanMetaData(BeanMetaDataManager.java:231) ~[hibernate-validator-5.3.6.Final.jar!/:5.3.6.Final]
	at org.hibernate.validator.internal.metadata.BeanMetaDataManager.isConstrained(BeanMetaDataManager.java:174) ~[hibernate-validator-5.3.6.Final.jar!/:5.3.6.Final]
	at org.hibernate.validator.internal.engine.ValidatorImpl.validate(ValidatorImpl.java:195) ~[hibernate-validator-5.3.6.Final.jar!/:5.3.6.Final]
	at io.cloudevents.v02.CloudEventBuilder.build(CloudEventBuilder.java:183) ~[cloudevents-api-0.3.1.jar!/:na]
	at io.cloudevents.v02.CloudEventBuilder.of(CloudEventBuilder.java:158) ~[cloudevents-api-0.3.1.jar!/:na]
	at io.cloudevents.v02.CloudEventBuilder.build(CloudEventBuilder.java:164) ~[cloudevents-api-0.3.1.jar!/:na]
	at io.cloudevents.v02.http.Unmarshallers$$Lambda$22.00000000182159E0.build(Unknown Source) ~[na:na]
	at io.cloudevents.format.BinaryUnmarshaller$Builder.unmarshal(BinaryUnmarshaller.java:241) ~[cloudevents-api-0.3.1.jar!/:na]
	at application.rest.v1.Events.event(Events.java:75) ~[classes!/:1.0-SNAPSHOT]
	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ~[na:1.8.0]

[gee4vee]

So adding this to my pom fixed it. Thanks!

<hibernate-validator.version>6.0.17.Final</hibernate-validator.version>

[gee4vee]

I see at com.google.gson.internal.ConstructorConstructor$3.construct(. We do not use gson.

Yes this seems to be related to a Java Cloudant Client issue. I will look into it separately, thanks.