java.lang.IllegalStateException: Expected BEGIN_OBJECT but was STRING at line 1 column 2 path $

Question

I am getting a response from a firebase function and dialogflow which hold some information that I need for further implementations. The response is a JSON, which I hold in mResultFromDialogFlow, which is a HashMap (String, Object) type variable.

I've searched other threads like this, but the strange thing was that my problem is at column 2, not 1 and I don't see the problem in the json. Here is the gson part. The error is thrown on the line with Properties!

Gson _gson = new Gson();
String _json = _gson.toJson(mResultFromDialogFlow.get("parameters"));
Properties data = _gson.fromJson(_json, Properties.class);
mTime = data.getProperty("date"); // String type variable
mDateFromUser = data.getProperty("time"); // String type variable

This is the response JSON:

{"date":"2019-07-19T12:00:00+03:00","time":"2019-07-19T14:00:00+03:00"}

So, apparantly, the _json has this value: "{\"time\":\"2019-07-19T14:00:00+03:00\",\"date\":\"2019-07-19T12:00:00+03:00\"}" @MC Emperor, yes — David Buzatu
– David Buzatu, Commented Jul 18, 2019 at 13:16
Have you added the quotes ? or is this the raw value ? Because the object should start with a { not a " — Arnaud Claudel
– Arnaud Claudel, Commented Jul 18, 2019 at 13:18
That looks like a JSON string converted to JSON. I suspect mResultFromDialogFlow.get("parameters") already returns a JSON string. With toJson(), you convert a JSON string to JSON. What happens if you try Properties data = _gson.fromJson(mResultFromDialogFlow.get("parameters"));? — MC Emperor
– MC Emperor, Commented Jul 18, 2019 at 13:19
@MCEmperor, you were right. I just needed to add mResultFromDialogFlow directly to _gson.fromJson — David Buzatu
– David Buzatu, Commented Jul 18, 2019 at 13:21

MC Emperor · Accepted Answer · 2019-07-18 13:21:44Z

1

That looks like a JSON string converted to JSON. I suspect mResultFromDialogFlow.get("parameters") already returns a JSON string. With toJson(), you convert a JSON string to JSON.

If you try

Properties data = _gson.fromJson(mResultFromDialogFlow.get("parameters"), Properties.class);

it'll probably work.

answered Jul 18, 2019 at 13:21

MC Emperor

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4 Comments

David Buzatu Over a year ago

Yes, this was it. I figured it out 1 minute earlier thanks to @MC Emperor

MC Emperor Over a year ago

@DavidBuzatu Well, that's me

David Buzatu Over a year ago

I am too tired, my bad. Thank you again

MC Emperor Over a year ago

@DavidBuzatu You should get some sleep ;-)

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