Use a POJO instead of String in "body" ApiGatewayRequest field

[destebanm]

Hi!

I have an issue related with the class ApiGatewayRequest:

Reading your comment about "body" field

if you require parameters from a transformed request body (e.g. POST payload)
then you'll need to define your POJO matching the expected deserialised object here
in place of the 'body' String property

I understand that
private String body;

 public String getBody() {
    return body;
}

public void setBody(String body) {
    this.body = body;
}

could be replaced by i.e Customer (Customer is my POJO)

private Customer body;

 public Customer getBody() {
    return body;
}

public void setBody(Customer body) {
    this.body = body;
}

Nevertheless, if i do that, i get the next error:

RuntimeException","stackTrace":[],"cause":{"errorMessage":"com.fasterxml.jackson.databind.JsonMappingException: Can not instantiate value of type [simple type, class com.naevatec.iot.pojos.Customer] from String value ('{\n "firstName":"Hello",\n "lastName":"World"\n}'); no single-String constructor/factory method\n at [Source: lambdainternal.util.NativeMemoryAsInputStream@3e57cd70; line: 1, column: 864] (through reference chain: com.naevatec.iot.pojos.apigateway.ApiGatewayRequest["body"])","errorType":"java.io.UncheckedIOException","stackTrace":[],"cause":{"errorMessage":"Can not instantiate value of type [simple type, class com.naevatec.iot.pojos.Customer] from String value ('{\n "firstName":"Hello",\n "lastName":"World"\n}'); no single-String constructor/factory method\n at [Source: lambdainternal.util.NativeMemoryAsInputStream@3e57cd70; line: 1, column: [TRUNCATED]

Were you be able to get working it?

Thanks!

[willh]

Hi @destebanm, I've not tried replicating your example. I might get a chance at some point this week to take a look, but I'd suggest three things for starters:

1. can you post the definition of your customer class here? It'll need a public constructor and public setters for the two firstName/lastName fields.
2. can you also post the definition of any API gateway settings you have mapping the request unless it's just an unchanged integration request?
3. as the docs here http://docs.aws.amazon.com/apigateway/latest/developerguide/api-gateway-set-up-simple-proxy.html?shortFooter=true#api-gateway-simple-proxy-for-lambda-input-format say that you'll get a "JSON string of the request payload" and your error message suggests it's trying to initialise a Customer object using just a string, you could try adding @JsonProperty annotations to your customer object's firstName and lastName fields and see if Jackson will fall through the parsing into your Customer object and deserialise it for you too?

[destebanm]

public class Customer implements Serializable {

	private static final long serialVersionUID = 1L;

	private String firstName;

	private String lastName;

	public Customer() {
	}

	public Customer(String firstName, String lastName) {
		this.firstName = firstName;
		this.lastName = lastName;
	}

	public String getFirstName() {
		return firstName;
	}

	public void setFirstName(String firstName) {
		this.firstName = firstName;
	}

	public String getLastName() {
		return lastName;
	}

	public void setLastName(String lastName) {
		this.lastName = lastName;
	}

}

2. I am using
   Lambda Function
   Use Lambda Proxy integration

eu-west-1
customers-create

3. This is what i am receiving from api gateway

{
"resource":"/customers",
"path":"/customers",
"httpMethod":"POST",
"headers":null,
"queryStringParameters":null,
"pathParameters":null,
"stageVariables":null,
"requestContext":{
"accountId":"xxxxx",
"resourceId":"vqbbwo",
"stage":"test-invoke-stage",
"requestId":"test-invoke-request",
"identity":{
"cognitoIdentityPoolId":null,
"accountId":"xxxxxx",
"cognitoIdentityId":null,
"caller":"xxxxxx:xxx@xxxx",
"apiKey":"test-invoke-api-key",
"sourceIp":"test-invoke-source-ip",
"accessKey":"xxxxx",
"cognitoAuthenticationType":null,
"cognitoAuthenticationProvider":null,
"userArn":"arn:aws:sts::xxxxxx:assumed-role/xxxxx",
"userAgent":"Apache-HttpClient/4.5.x (Java/1.8.0_102)",
"user":"xxxxxxx"
},
"resourcePath":"/customers",
"httpMethod":"POST",
"apiId":"xxxx"
},
"body":"{\n "firstName":"firstName1",\n "lastName":"lastName1"\n}",
"isBase64Encoded":false
}

I think that the main issue is that body is not an object, is a string with quotes

I tried using @JsonProperty but it did not work

Thanks!