Expected BEGIN_ARRAY but was BEGIN_OBJECT json

Question

Hi I am trying to make a changelog list from my REST API to my App, but I have some problems with this error line here:

Expected BEGIN_ARRAY but was BEGIN_OBJECT at line 1 column 2 path $

The JSON output:

{
    "forced": "true",
    "version": "1.0A(125)",
    "description": [
        {
            "description": "Fixed some things 1"
        },
        {
            "description": "Fixed some things 2"
        },
        {
            "description": "Fixed some things 3"
        },
        {
            "description": "Fixed some things 4"
        }
    ]
}

My REST Call:

@GET("updatecheck")
Observable<List<UpdateCheckResponse>> UpdateCheckChangeLog();

Here is my Pojo class named: UpdateCheckResponse.java

public class UpdateCheckResponse {
    @SerializedName("forced")
    @Expose
    private String forced;
    @SerializedName("version")
    @Expose
    private String version;
    @SerializedName("description")
    @Expose
    private List<UpdateCheckDescription> description = null;

    public String getForced() {
        return forced;
    }

    public void setForced(String forced) {
        this.forced = forced;
    }

    public String getVersion() {
        return version;
    }

    public void setVersion(String version) {
        this.version = version;
    }

    public List<UpdateCheckDescription> getDescription() {
        return description;
    }

    public void setDescription(List<UpdateCheckDescription> description) {
        this.description = description;
    }
}

My POJO named: UpdateCheckDescription.java

public class UpdateCheckDescription {
    @SerializedName("description")
    @Expose
    private String description;

    public String getDescription() {
        return description;
    }

    public void setDescription(String description) {
        this.description = description;
    }
}

UpdateChangeLogAdapter.class

public class UpdateChangeLogAdapter extends RecyclerView.Adapter<UpdateChangeLogAdapter.ViewHolder> {

    private ArrayList<UpdateCheckDescription> mAndroidList;

    public UpdateChangeLogAdapter(ArrayList<UpdateCheckDescription> androidList) {
        mAndroidList = androidList;
    }


    @Override
    public ViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {

        View view = LayoutInflater.from(parent.getContext()).inflate(R.layout.list_item_update, parent, false);
        return new ViewHolder(view);
    }

    @Override
    public void onBindViewHolder(ViewHolder holder, int position) {

        holder.mTvChangelog.setText(mAndroidList.get(position).getDescription());
    }

    @Override
    public int getItemCount() {
        return mAndroidList.size();
    }

    public class ViewHolder extends RecyclerView.ViewHolder{

        private TextView mTvChangelog;
        public ViewHolder(View view) {
            super(view);

            mTvChangelog = (TextView)view.findViewById(R.id.descriptionTextView);
        }
    }
}

And here is the call from my UpdateActivity class:

private void loadJSON() {

    FitnessM8REST apiService =
            FitnessM8RestClient.getClient().create(FitnessM8REST.class);

    mCompositeDisposable.add(apiService.UpdateCheckChangeLog()
            .observeOn(AndroidSchedulers.mainThread())
            .subscribeOn(Schedulers.io())
            .subscribe(this::handleResponse,this::handleError));
}

private void handleResponse(List<UpdateCheckResponse> androidList) {

    mAndroidArrayList = new ArrayList<>(androidList);
    mAdapter = new UpdateChangeLogAdapter(mAndroidArrayList);
    mRecyclerView.setAdapter(mAdapter);
}

private void handleError(Throwable error) {
    Toast.makeText(this, "Error "+error.getLocalizedMessage(), Toast.LENGTH_SHORT).show();
    Log.d("Error: ", error.getLocalizedMessage());

}

The error message is pretty self-explanatory. You told it to expect a JSON Array in the response, but it received a JSON Object instead. — Elan Hamburger, Jul 27 '17 at 16:39

score 0 · Accepted Answer · answered Jul 27 '17 at 16:39

See you are doing a wrong call

your method should be

@GET("updatecheck")Call<UpdateCheckResponse> methodName();

and while handling the response you can do something like

List<UpdateCheckDescription> description;
description = response.body().getDescription();

and then pass that description Collection object in your adapter. You are calling an List object directly to response but actually the Array of objects is inside an object

Expected BEGIN_ARRAY but was BEGIN_OBJECT json

1 Answers1