Can I post JSON format in AWS Lambda function?

Question

I have a JSON file and I want to send it to the RequestHandler. The error response is the following: java.util.LinkedHashMap cannot be cast to java.lang.String

What you are calling a "JSON file" in your question is obviously stored as a LinkedHashMap in your application's memory according to the error message. So you need to lookup how to convert a HashMap to a JSON String. — Mark B
– Mark B, Commented Jun 14, 2019 at 14:38

rmssoares · Accepted Answer · 2019-06-14 15:48:52Z

2

You're attempting to send a LinkedHashMap, as the error and @Mark B says, to the RequestHandler. Instead, "stringify" it into a JSON string first. I recommend one of two libraries for this.

Google's GSON library

String jsonString = new Gson().toJson(jsonData, LinkedHashMap.class);

Java's JSON library

String jsonString = new JSONObject(jsonData).toString()

Then, send this string to the RequestHandler. Hope this helps.

answered Jun 14, 2019 at 15:48

rmssoares

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