CODEWITHSUNDEEP
javajsonaws-lambdacloudevents
krisrr3
krisrr3

Reputation: 105

Lambda, Java and CloudEvents

I a have a Lambda function (java), which get triggered from Confluent Cloud Lambda Connector.

The Lambda is being triggered but is failing because of deserialization errors.

The signature is as follows

public class App implements RequestHandler<CloudEvent, Map<String, String>> {
private static final Logger logger = LoggerFactory.getLogger(App.class);

public Map<String,String> handleRequest(CloudEvent event, Context context) {

The error is

java.lang.RuntimeException: An error occurred during JSON parsing
Caused by: java.io.UncheckedIOException: >com.amazonaws.lambda.thirdparty.com.fasterxml.jackson.databind.exc.InvalidDefinitionException: Cannot construct instance of io.cloudevents.CloudEvent (no Creators, like default construct, exist): abstract types either need to be mapped to concrete types, have custom deserializer, or contain additional type information
 at [Source: (ByteArrayInputStream); line: 1, column: 1]
    at >com.amazonaws.services.lambda.runtime.serialization.factories.JacksonFactory$InternalSerializer.fromJson(JacksonFactory.java:184)
Caused by: com.amazonaws.lambda.thirdparty.com.fasterxml.jackson.databind.exc.InvalidDefinitionException: Cannot construct instance of io.cloudevents.CloudEvent (no Creators, like default construct, exist): abstract types either need to be mapped to concrete types, have custom deserializer, or contain additional type information
 at [Source: (ByteArrayInputStream); line: 1, column: 1]
    at com.amazonaws.lambda.thirdparty.com.fasterxml.jackson.databind.exc.InvalidDefinitionException.from(InvalidDefinitionException.java:67)
    at com.amazonaws.lambda.thirdparty.com.fasterxml.jackson.databind.DeserializationContext.reportBadDefinition(DeserializationContext.java:1592)
    at com.amazonaws.lambda.thirdparty.com.fasterxml.jackson.databind.DeserializationContext.handleMissingInstantiator(DeserializationContext.java:1058)
    at com.amazonaws.lambda.thirdparty.com.fasterxml.jackson.databind.deser.AbstractDeserializer.deserialize(AbstractDeserializer.java:265)
    at com.amazonaws.lambda.thirdparty.com.fasterxml.jackson.databind.ObjectReader._bindAndClose(ObjectReader.java:1719)
    at com.amazonaws.lambda.thirdparty.com.fasterxml.jackson.databind.ObjectReader.readValue(ObjectReader.java:1228)
    at com.amazonaws.services.lambda.runtime.serialization.factories.JacksonFactory$InternalSerializer.fromJson(JacksonFactory.java:182)

Has anyone faced this before and knows how I should tackle it?

Upvotes: 0

Views: 267

Answers (0)

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