I am writing a spring cloud function (latest build) to deploy into AWS. I understand that the AWS lambda handler uses its own Jackson configuration. I wrote a custom serializer. But, how do I override or configure the default AWS lambda one?
package com.ttp.api;
import com.fasterxml.jackson.core.JsonGenerator;
import com.fasterxml.jackson.core.JsonParser;
import com.fasterxml.jackson.core.JsonProcessingException;
import com.fasterxml.jackson.databind.DeserializationContext;
import com.fasterxml.jackson.databind.JsonDeserializer;
import com.fasterxml.jackson.databind.JsonSerializer;
import com.fasterxml.jackson.databind.SerializerProvider;
import org.bson.types.ObjectId;
import org.springframework.stereotype.Component;
import java.io.IOException;
@Component
public class ObjectIdJsonConverter {
public static class ObjectIdSerializer extends JsonSerializer<ObjectId> {
@Override
public void serialize(ObjectId objectId, JsonGenerator jsonGenerator, SerializerProvider serializerProvider) throws IOException {
if (objectId == null) {
jsonGenerator.writeNull();
} else {
jsonGenerator.writeString(objectId.toHexString());
}
}
}
public static class ObjectIdDeserializer extends JsonDeserializer<ObjectId> {
@Override
public ObjectId deserialize(JsonParser jsonParser, DeserializationContext deserializationContext) throws IOException, JsonProcessingException {
String objectIdString = jsonParser.readValueAs(String.class);
return new ObjectId(objectIdString);
}
}
}
I tried this in my main application, but either get the bean can't be overridden (I tried the spring boot property). If I take that I get the error below.
@Bean
@Primary
public ObjectMapper objectMapper() {
ObjectMapper objectMapper = new ObjectMapper();
objectMapper.registerModule(new JavaTimeModule());
SimpleModule objectIdModule = new SimpleModule("ObjectIdModule");
objectIdModule.addSerializer(ObjectId.class, new ObjectIdJsonConverter.ObjectIdSerializer());
objectIdModule.addDeserializer(ObjectId.class, new ObjectIdJsonConverter.ObjectIdDeserializer());
objectMapper.registerModule(objectIdModule);
return objectMapper;
}
{"errorMessage":"Failed to convert. Possible bug as the conversion probably shouldn't have been attempted here","errorType":"java.lang.IllegalStateException","stackTrace":["org.springframework.cloud.function.json.JacksonMapper.doFromJson(JacksonMapper.java:65)","org.springframework.cloud.function.json.JsonMapper.fromJson(JsonMapper.java:66)","org.springframework.cloud.function.adapter.aws.AWSLambdaUtils.generateMessage(AWSLambdaUtils.java:90)","org.springframework.cloud.function.adapter.aws.FunctionInvoker.handleRequest(FunctionInvoker.java:83)","java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method)","java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)","java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)","java.base/java.lang.reflect.Method.invoke(Unknown Source)"],"cause":{"errorMessage":"No content to map due to end-of-input\n at [Source: (byte[])\"\"; line: 1, column: 0]","errorType":"com.fasterxml.jackson.databind.exc.MismatchedInputException","stackTrace":["com.fasterxml.jackson.databind.exc.MismatchedInputException.from(MismatchedInputException.java:59)","com.fasterxml.jackson.databind.ObjectMapper._initForReading(ObjectMapper.java:4821)","com.fasterxml.jackson.databind.ObjectMapper._readMapAndClose(ObjectMapper.java:4723)","com.fasterxml.jackson.databind.ObjectMapper.readValue(ObjectMapper.java:3771)","org.springframework.cloud.function.json.JacksonMapper.doFromJson(JacksonMapper.java:55)","org.springframework.cloud.function.json.JsonMapper.fromJson(JsonMapper.java:66)","org.springframework.cloud.function.adapter.aws.AWSLambdaUtils.generateMessage(AWSLambdaUtils.java:90)","org.springframework.cloud.function.adapter.aws.FunctionInvoker.handleRequest(FunctionInvoker.java:83)","java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method)","java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)","java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)","java.base/java.lang.reflect.Method.invoke(Unknown Source)"]}}
Here is my function
@Component
public class ListCustomers implements Supplier<Flux<Subscriber>> {
public static final Logger LOGGER = LoggerFactory.getLogger(AddCustomer.class);
@Autowired
private CustomerRepository customerRepository;
@Override
public Flux<Subscriber> get() {
Flux<Subscriber> customers = this.customerRepository
.findAll()
.log();
return customers;
}
}
Here is my Pojo
@NoArgsConstructor
@Data
@Setter
@Getter
@AllArgsConstructor
@Document("subscriber")
public class Subscriber {
@Id
//@JsonSerialize(using = ObjectIdJsonConverter.ObjectIdSerializer.class)
//@JsonDeserialize(using = ObjectIdJsonConverter.ObjectIdDeserializer.class)
private ObjectId _id;
private String firstName;
private String lastName;
private String emailAddress;
}
