CODEWITHSUNDEEP
javajson
N S
N S

Reputation: 3

java.lang.IllegalStateException error message

I'm using Eclipse to covert json to a string in Java. But I keep getting the:

com.google.gson.JsonSyntaxException: java.lang.IllegalStateException

error message each time I try to run my program. Eclipse doesn't recognize any errors/faults with my code. I've done some research and it seems that my json is not valid (I used JSONLint).

This is my json:

String json =     
 "{"
                +"'$type': 'Tfl.Api.Presentation.Entities.RoadCorridor, Tfl.Api.Presentation.Entities',"
                + "'id' : a1,"
                + "'displayName' : 'A1',"
                + "'statusSeverity' : 'Good',"
                + "'statusSeverityDescription' : 'No Exceptional Delays',"
                + "'bounds' : '[[-0.25616,51.5319],[-0.10234,51.6562]]',"
                + "'envelope' : '[[-0.25616,51.5319],[-0.25616,51.6562],[-0.10234,51.6562],[-0.10234,51.5319],[-0.25616,51.5319]]',"
                + "'url' : 'https://api-argon.tfl.gov.uk/Road/a1'"
                + "}";

Please can someone tell me what is wrong with the json and how I can change it so its valid? I'm quite new to java and json so sorry if I missed out any details that I should have included.

Upvotes: 0

Views: 1124

Answers (3)

Max Cheetham
Max Cheetham

Reputation: 143

You will oftern run into problems using single quotes instead of double quotes

 {
    "$type": "Tfl.Api.Presentation.Entities.RoadCorridor, Tfl.Api.Presentation.Entities",
    "id": "a1",
    "displayName": "A1",
    "statusSeverity": "Good",
    "statusSeverityDescription": "No Exceptional Delays",
    "bounds": "[[-0.25616,51.5319],[-0.10234,51.6562]]",
    "envelope": "[[-0.25616,51.5319],[-0.25616,51.6562],[-0.10234,51.6562],[-0.10234,51.5319],[-0.25616,51.5319]]",
    "url": "https://api-argon.tfl.gov.uk/Road/a1"
 }

here is your json now valid, for reference i find that jsonlint.com is fantastic at helping debug invalid json

Upvotes: 3

Anand Vaidya
Anand Vaidya

Reputation: 1461

You may want to use change it like below. There is a problem in handling of arrays. 

{
'$type': {
    'Tfl.Api.Presentation.Entities.RoadCorridor, Tfl.Api.Presentation.Entities'
},
'id': a1,
'displayName': 'A1',
'statusSeverity': 'Good',
'statusSeverityDescription': 'No Exceptional Delays',
'bounds': '[[-0.25616,51.5319],[-0.10234,51.6562]]',
'envelope': '[[-0.25616,51.5319],[-0.25616,51.6562],[-0.10234,51.6562],[-0.10234,51.5319],[-0.25616,51.5319]]',
'url': 'https://api-argon.tfl.gov.uk/Road/a1'

}

refer here - http://www.w3schools.com/js/js_json_intro.asp

Upvotes: 0

DonyorM
DonyorM

Reputation: 1800

You're using single quotes for your json identifiers. Use double-quotes.

"\"$type\": \"Tfl.Api.Presentation.Entities.RoadCorridor, Tfl.Api.Presentation.Entities\"," + etc.

The error is because your json code is malformed, those single quotes, while convenient in Java, are not valid for json.

Upvotes: 3

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