Erwartete BEGIN_OBJECT aber war STRING mit Gson

Question

ich eine Antwort von Retrofit 2 wie immer:

{"error":"0","posts":[{"account_id":61,"industry_id":1,"company_id":1,"profession_id":1,"description":"Demo Post 13","tags":"Cinema","created_at":"2016-12-05 10:47:41","totalFlags":0,"totalComments":0},{"account_id":65,"industry_id":2,"company_id":13,"profession_id":11,"description":"Demo Post 12","tags":"Cinema","created_at":"2016-12-05 10:47:33","totalFlags":0,"totalComments":0},{"account_id":65,"industry_id":2,"company_id":13,"profession_id":11,"description":"Demo Post 11","tags":"Culture","created_at":"2016-12-05 10:47:17","totalFlags":0,"totalComments":0}]}

und ich habe zwei Artikel erklärt:

public class FeedServiceResponse implements Serializable { 

    private String error; 
    private FeedServiceResponseItem[] posts; 

    // getters/setters omitted 
} 

und

public class FeedServiceResponseItem implements Serializable { 

    private int account_id; 
    private int industry_id; 
    private int company_id; 
    private int profession_id; 
    private String description; 
    private String tags; 
    private String created_at; 
    private String totalFlags; 
    private int totalComments; 

// again getters/setters omitted 

} 

aber innerhalb onResponse() von Retrofit wenn ich versuche, solche Daten zu deserialisieren:

FeedServiceResponse feedServiceResponse = gson.fromJson(response.body().toString(), FeedServiceResponse.class); 

bekomme ich folgende Fehlermeldung:

12-05 17:15:17.318 16724-16724/MY_PACKAGE.mock E/AndroidRuntime: FATAL EXCEPTION: main 
Process: MY_PACKAGE.mock, PID: 16724 
com.google.gson.JsonSyntaxException: java.lang.IllegalStateException: Expected BEGIN_OBJECT but was STRING at line 1 column 1 path $ 
    at com.google.gson.internal.bind.ReflectiveTypeAdapterFactory$Adapter.read(ReflectiveTypeAdapterFactory.java:224) 
    at com.google.gson.Gson.fromJson(Gson.java:887) 
    at com.google.gson.Gson.fromJson(Gson.java:852) 
    at com.google.gson.Gson.fromJson(Gson.java:801) 
    at com.google.gson.Gson.fromJson(Gson.java:773) 
    at MY_PACKAGE.main.fragments.feed.FeedRepository$1.onResponse(FeedRepository.java:50) 
    at retrofit2.ExecutorCallAdapterFactory$ExecutorCallbackCall$1$1.run(ExecutorCallAdapterFactory.java:68) 
    at android.os.Handler.handleCallback(Handler.java:733) 
    at android.os.Handler.dispatchMessage(Handler.java:95) 
    at android.os.Looper.loop(Looper.java:136) 
    at android.app.ActivityThread.main(ActivityThread.java:5086) 
    at java.lang.reflect.Method.invokeNative(Native Method) 
    at java.lang.reflect.Method.invoke(Method.java:515) 
    at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:785) 
    at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:601) 
    at dalvik.system.NativeStart.main(Native Method) 
    Caused by: java.lang.IllegalStateException: Expected BEGIN_OBJECT but was STRING at line 1 column 1 path $ 
    at com.google.gson.stream.JsonReader.beginObject(JsonReader.java:385) 
    at com.google.gson.internal.bind.ReflectiveTypeAdapterFactory$Adapter.read(ReflectiveTypeAdapterFactory.java:213) 
    at com.google.gson.Gson.fromJson(Gson.java:887)  
    at com.google.gson.Gson.fromJson(Gson.java:852)  
    at com.google.gson.Gson.fromJson(Gson.java:801)  
    at com.google.gson.Gson.fromJson(Gson.java:773)  
    at MY_PACKAGE.main.fragments.feed.FeedRepository$1.onResponse(FeedRepository.java:50)  
    at retrofit2.ExecutorCallAdapterFactory$ExecutorCallbackCall$1$1.run(ExecutorCallAdapterFactory.java:68)  
    at android.os.Handler.handleCallback(Handler.java:733)  
    at android.os.Handler.dispatchMessage(Handler.java:95)  
    at android.os.Looper.loop(Looper.java:136)  
    at android.app.ActivityThread.main(ActivityThread.java:5086)  
    at java.lang.reflect.Method.invokeNative(Native Method)  
    at java.lang.reflect.Method.invoke(Method.java:515)  
    at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:785)  
    at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:601)  
    at dalvik.system.NativeStart.main(Native Method)  

Ich habe andere Fragen/Antworten auf StackOverflow aber kann nicht scheinen zu finden, was ich falsch mache.

Answer 1

Es scheint, dass Ihr Server nicht mit JSON-Daten antwortet. Sie sollten es mit einem Inspektionswerkzeug überprüfen oder indem Sie die Protokollierung aktivieren.