json.simple.JSONObject cannot be cast to java.lang.String with AWS Lambda JAVA

Question

I'am trying to parse the 'Body' from a POST request with a Java Lambda. I'am stuck on this error for a while.

 org.json.simple.JSONObject cannot be cast to java.lang.String

But the Body when logged look like that :

{"body":{"email":"[email protected]"}}

Witch should work with the parsing i'am doing right ? The weird thing is the insert is working on local with JUNIT but not online after on AWS.

@Override
public void handleRequest(InputStream inputStream, OutputStream outputStream, Context context) throws IOException {
    logger = context.getLogger();
    BufferedReader reader = new BufferedReader(new InputStreamReader(inputStream));
    Number user_id = null;
    String birthdate = null;
    List<Number> company_id = new ArrayList<Number>();
    String email = null;
    String employment_status = null;
    String firstname = null;
    String lastname = null;
    String login = null;
    String profile = null;
    List<Number> site_id = new ArrayList<Number>();
    String validation_status = null;
    JSONObject responseJson = new JSONObject();

    Map<String, AttributeValue> expressionAttributeValues = new HashMap<String, AttributeValue>();
    String filterExpression = "";
    String RegionAWS = REGION.toString();
    client = AmazonDynamoDBClientBuilder.standard().withRegion(RegionAWS).build();
    DynamoDB dynamoDB = new DynamoDB(client);
    Table table = dynamoDB.getTable("LI_user");
    try {
        JSONParser parser = new JSONParser();
        JSONObject event = (JSONObject) parser.parse(reader);
        logger.log(event.toJSONString());
        if (event.get("body") != null) {
            JSONObject bod = (JSONObject)parser.parse((String)event.get("body"));
         //   JSONObject bod = (JSONObject) event.get("body");
            if ( bod.get("id") != null) {
                user_id = (Number)bod.get("id");
            }
            if ( bod.get("birthdate") != null) {
                birthdate = (String)bod.get("birthdate");
            }
            if ( bod.get("email") != null) {
                email = (String) bod.get("email");
            }
            if ( bod.get("employment_status") != null) {
                employment_status = (String) bod.get("employment_status");
            }
            if ( bod.get("firstname") != null) {
                firstname = (String) bod.get("firstname");
            }
            if ( bod.get("lastname") != null) {
                lastname = (String) bod.get("lastname");
            }
            if ( bod.get("login") != null) {
                login = (String) bod.get("login");
            }
            if ( bod.get("profile") != null) {
                profile = (String) bod.get("profile");
            }
            if ( bod.get("validation_status") != null) {
                validation_status = (String) bod.get("validation_status");
            }
        }

You already had logger.log(event.toJSONString()); as event is a JSONObject. So why not replacing JSONObject bod = (JSONObject)parser.parse((String)event.get("body")); with JSONObject bod = (JSONObject)event.get("body"); — Davide Cavestro
– Davide Cavestro, Commented Oct 11, 2017 at 10:01

Davide Cavestro · Accepted Answer · 2017-10-11 10:04:01Z

1

Replace

JSONObject bod = (JSONObject)parser.parse((String)event.get("body"));

with

JSONObject bod = (JSONObject)event.get("body");

if event is always an instance of JSONObject (as it seems granted, otherwise you would get a ClassCast at JSONObject event = (JSONObject) parser.parse(reader);)

You see logged

{"body":{"email":"[email protected]"}}

just because of logger.log(event.toJSONString());

answered Oct 11, 2017 at 10:04

Davide Cavestro

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Florian VIDAL · Accepted Answer · 2017-10-11 10:12:17Z

0

Yes thanks you i have progress. But now its seem like when i send the data on JSON format with Postman, that he receive a stringified version of the body. I get this data on cloudwatch logs :

     "resource": "/users",
    "httpMethod": "POST",
    "queryStringParameters": null,
    "stageVariables": null,
    "body": "{\n \"id\": 5,\n \"company_id\": [\n    1\n  ],\n \"email\": \"[email protected]\",\n \"employment_status\": \"FULL-TIME\",\n \"firstname\": \"Sebastien\",\n \"lastname\": \"LALALLALA\",\n \"login\": \"[email protected]\",\n \"profile\": \"FULL-TIME\",\n \"site_id\": \"55\",\n \"birthdate\": \"1985.05.05\",\n \"validation_status\" : \"COMPLETE\"\n}\n"
}

And this error :

java.lang.ClassCastException: java.lang.String cannot be cast to org.json.simple.JSONObject

answered Oct 11, 2017 at 10:12

Florian VIDAL

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2 Comments

Davide Cavestro Over a year ago

Are you sending a raw json body from Postman? Did you set an contentType header? If the structure of the request is stable, you could also consider using a POJO instead than consuming from an InputStream and using so many typecasts, i.e. see docs.aws.amazon.com/lambda/latest/dg/…

Florian VIDAL Over a year ago

Hello, yes i'am sending raw json body and content type is set to application/json

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