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Unable to read value of image arr. How can I read the value of Image arr using jackson json mapper .

JSON 

{ query: "rann of kutch", response: { image: [ "http://www.ouralaskancruise.com/wp-content/uploads/2010/05/Princess_Denali_Express_Rail.jpg" ], source: "chatbot", text: "Very interesting.", time: 5572 }, uid: "11222" }

Code:

String responseJson = null; try { responseJson = Utils.executeHttpGet(url); } catch (Exception e) { if (e != null) { error = e.getMessage(); e.printStackTrace(); } }

Classes

public class ResponseDetails { public String query; public String uid; public Response response; } public class Response { public Image image; public String source; public String text; public long time; } public class Image { public ArrayList<String> urls; //public String url; }

Exception:

11-07 18:48:34.321: W/System.err(15921): com.fasterxml.jackson.databind.JsonMappingException: Can not deserialize instance of com.Travel.TravelChat.DataClasses.Image out of START_ARRAY token 11-07 18:48:34.321: W/System.err(15921): at [Source: java.io.StringReader@417fbc70; line: 4, column: 5] (through reference chain: com.Travel.TravelChat.DataClasses.ResponseDetails["response"]->com.Travel.TravelChat.DataClasses.Response["image"]) 11-07 18:48:34.341: W/System.err(15921): at com.fasterxml.jackson.databind.DeserializationContext.mappingException(DeserializationContext.java:575) 11-07 18:48:34.341: W/System.err(15921): at com.fasterxml.jackson.databind.DeserializationContext.mappingException(DeserializationContext.java:569) 11-07 18:48:34.341: W/System.err(15921): at com.fasterxml.jackson.databind.deser.BeanDeserializerBase.deserializeFromArray(BeanDeserializerBase.java:1121) 11-07 18:48:34.341: W/System.err(15921): at com.fasterxml.jackson.databind.deser.BeanDeserializer._deserializeOther(BeanDeserializer.java:148) 11-07 18:48:34.341: W/System.err(15921): at com.fasterxml.jackson.databind.deser.BeanDeserializer.deserialize(BeanDeserializer.java:123) 11-07 18:48:34.341: W/System.err(15921): at com.fasterxml.jackson.databind.deser.SettableBeanProperty.deserialize(SettableBeanProperty.java:464) 11-07 18:48:34.341: W/System.err(15921): at com.fasterxml.jackson.databind.deser.impl.FieldProperty.deserializeAndSet(FieldProperty.java:107) 11-07 18:48:34.341: W/System.err(15921): at com.fasterxml.jackson.databind.deser.BeanDeserializer.deserializeFromObject(BeanDeserializer.java:295) 11-07 18:48:34.341: W/System.err(15921): at com.fasterxml.jackson.databind.deser.BeanDeserializer.deserialize(BeanDeserializer.java:121) 11-07 18:48:34.341: W/System.err(15921): at com.fasterxml.jackson.databind.deser.SettableBeanProperty.deserialize(SettableBeanProperty.java:464) 11-07 18:48:34.341: W/System.err(15921): at com.fasterxml.jackson.databind.deser.impl.FieldProperty.deserializeAndSet(FieldProperty.java:107) 11-07 18:48:34.341: W/System.err(15921): at com.fasterxml.jackson.databind.deser.BeanDeserializer.deserializeFromObject(BeanDeserializer.java:295) 11-07 18:48:34.341: W/System.err(15921): at com.fasterxml.jackson.databind.deser.BeanDeserializer.deserialize(BeanDeserializer.java:121) 11-07 18:48:34.341: W/System.err(15921): at com.fasterxml.jackson.databind.ObjectMapper._readMapAndClose(ObjectMapper.java:2888) 11-07 18:48:34.341: W/System.err(15921): at com.fasterxml.jackson.databind.ObjectMapper.readValue(ObjectMapper.java:2034) 11-07 18:48:34.341: W/System.err(15921): at com.Travel.TravelChat.Helpers.Utils.readResponseDetailsJson(Utils.java:97) 11-07 18:48:34.341: W/System.err(15921): at com.Travel.TravelChat.Helpers.GetResponseTask.doInBackground(GetResponseTask.java:46) 11-07 18:48:34.341: W/System.err(15921): at com.Travel.TravelChat.Helpers.GetResponseTask.doInBackground(GetResponseTask.java:1) 11-07 18:48:34.341: W/System.err(15921): at android.os.AsyncTask$2.call(AsyncTask.java:264) 11-07 18:48:34.341: W/System.err(15921): at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:305) 11-07 18:48:34.341: W/System.err(15921): at java.util.concurrent.FutureTask.run(FutureTask.java:137) 11-07 18:48:34.341: W/System.err(15921): at android.os.AsyncTask$SerialExecutor$1.run(AsyncTask.java:208) 11-07 18:48:34.341: W/System.err(15921): at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1076) 11-07 18:48:34.341: W/System.err(15921): at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:569) 11-07 18:48:34.341: W/System.err(15921): at java.lang.Thread.run(Thread.java:856) 11-07 18:48:34.341: W/dalvikvm(15921): threadid=11: thread exiting with uncaught exception (group=0x40c18a68) 11-07 18:48:34.351: E/AndroidRuntime(15921): FATAL EXCEPTION: AsyncTask #1

I have gone through the following links : JsonMappingException: out of START_ARRAY token

Cannot deserialize instance of object out of START_ARRAY token in Spring 3 REST Webservice

Please help .

Thanks!

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3 Answers 3

Reset to default
1

If you want to keep you object model, your json should look like this :

{ query: "rann of kutch", response: { image : { urls: ["http://www.ouralaskancruise.com/wp-content/uploads/2010/05/Princess_Denali_Express_Rail.jpg"] }, source: "chatbot", text: "Very interesting.", time: 5572 }, uid: "11222" }

edit

As the JSON can't be changed, like @Chaosit said, change your bean definition to

public class Response { public List<String> image; public String source; public String text; public long time; }

}

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0

The problem is actually that you're trying to deserialize an instance of Image class when you have an array of strings. Try declaring a Response class in the following way:

public class Response { @JsonProperty("image") public List<String> images; public String source; public String text; public long time;

}

You can find these annotations here: https://github.com/FasterXML/jackson-annotations

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2 Comments

List<String> images returns null value, changing it to image* gave the correct arr. thanks
Oh yeah, sorry I've forgotten to add an annotation, please see the edited answer to discover the way to name variable in more convenient way
0

If , we send one object then no need JSON.stringifyIf else make an ajax call Like this to send group of objects. 

data : "data=" + JSON.stringify(data)

then it works.

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