android - Jackson + Gson + Retrofit Expected BEGIN_OBJECT but was BEGIN_ARRAY -

i know has been asked lot but, none of question i've found solve especific problem.

here json

[json url][1]

[   {           "unit":"imeca",     "value":29,   },   {     "unit":"imeca",     "value":43,   } ] 

this dto

zona.java

  public class zona {   private string unit;   private int value;    public string getunit() {     return unit;   }    public void setunit(string unit) {     this.unit = unit;   }    public int getvalue() {     return value;   }    public void setvalue(int value) {     this.value = value;   }    @override   public string tostring() {     return string.valueof(unit) + ": " + string.valueof(value);   } } 

and interface

api.java

public interface api {   @get("/data/heatmap_stations.json")   call<zona> getzona(); } 

i kind of understand why happens , because json array response jackson + gson expecting single json object.

i tried creating pojo this:

zonas.java

public class zonas extends arraylist<zona> {} 

and changing call signature in interface , retrofit call, replacing single dto plural, (from call< zona > call< zonas >, replacing single class 1 inherits arraylist<>), nothing, mean, didn't threw exception, didn't threw response either.

change

public interface api {   @get("/data/heatmap_stations.json")   call<zona> getzona(); } 

to

public interface api {   @get("/data/heatmap_stations.json")   call<list<zona>> getzona(); } 

you telling expect single zona object returning array of zona objects