Cannot deserialize value of type `java.lang.String` from Object value (token `JsonToken.START_OBJECT`
I am trying to send back a result from a Lambda to my LexV2 bot, everything seems to be routed correctly until Lex displays the result in the test chat :
Invalid Lambda Response: "Received invalid response from Lambda: Cannot deserialize value of type java.lang.String from Object value (token JsonToken.START_OBJECT) at [Source: (String)"{"sessionState": {"activeContexts": [{"name":..."
I don't get where is the issue since my lambda returns the appropriate format for the response :
What am I missing here ?
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Ok, I initially did not think it was a format issue at first but it is. The response is in the correct format that Lex can receive except my 'message' portion which was in the incorrect format.
Can you try to use JSON.dumps (if using python) or similar to what JSON.stringify does for Javascript? Wrap the whole response object.
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I tried that, this is what I get on the lex chat side : Invalid Lambda Response: Received invalid response from Lambda: Cannot construct instance of
IntentResponse(although at least one Creator exists): no String-argument constructor/factory method to deserialize from String value ('{"sessionState": {"activeContexts":...<rest of the lambda response>.here is where I get the response right before I send it back to lex : print(f"Response: {intent_name} -> Lambda: {fn_name} : {payload}") the resulting log : Response: ListProducts -> Lambda: LexListProducts : { "sessionState": { "activeContexts": [ { "name": "intentContext", "contextAttributes": {}, "timeToLive": { "timeToLiveInSeconds": 600, "turnsToLive": 1 } } ], "sessionAttributes": {}, "dialogAction": { "type": "Close" }, "intent": { "confirmationState": "None", "name": "ListProducts", "slots": {}, "state": "InProgress" } }, "messages": [ { "contentType": "PlainText", "content": { "contentType": "PlainText", "content": "On vend des pommes" } } ] }