Retrofit + gson + stackoverflow

[rhespanhol]

Im using retrofit + gson to pull and parse some json from a webservice to this object. Now i want to use that same object as Model but i keep getting stackoverflow.
Is there anyway to fix this?

 java.lang.StackOverflowError
            at com.google.gson.internal.$Gson$Types.resolve($Gson$Types.java:380)
            at com.google.gson.internal.$Gson$Types.resolve($Gson$Types.java:375)
            at com.google.gson.internal.$Gson$Types.resolve($Gson$Types.java:380)
            at com.google.gson.internal.$Gson$Types.resolve($Gson$Types.java:375)
            at com.google.gson.internal.$Gson$Types.resolve($Gson$Types.java:380)
            at com.google.gson.internal.$Gson$Types.resolve($Gson$Types.java:375)
            at com.google.gson.internal.$Gson$Types.resolve($Gson$Types.java:380)
            at com.google.gson.internal.$Gson$Types.resolve($Gson$Types.java:375)
            at com.google.gson.internal.$Gson$Types.resolve($Gson$Types.java:380)
            at com.google.gson.internal.$Gson$Types.resolve($Gson$Types.java:375)
            at com.google.gson.internal.$Gson$Types.resolve($Gson$Types.java:380)
            at com.google.gson.internal.$Gson$Types.resolve($Gson$Types.java:375)
            at com.google.gson.internal.$Gson$Types.resolve($Gson$Types.java:380)
            at com.google.gson.internal.$Gson$Types.resolve($Gson$Types.java:375)
            at com.google.gson.internal.$Gson$Types.resolve($Gson$Types.java:380)
            at com.google.gson.internal.$Gson$Types.resolve($Gson$Types.java:375)
            at com.google.gson.internal.$Gson$Types.resolve($Gson$Types.java:380)
            at com.google.gson.internal.$Gson$Types.resolve($Gson$Types.java:375)
            at com.google.gson.internal.$Gson$Types.resolve($Gson$Types.java:380)
            at com.google.gson.internal.$Gson$Types.resolve($Gson$Types.java:375)
            at com.google.gson.internal.$Gson$Types.resolve($Gson$Types.java:355)
            at com.google.gson.internal.bind.ReflectiveTypeAdapterFactory.getBoundFields(ReflectiveTypeAdapterFactory.java:117)
            at com.google.gson.internal.bind.ReflectiveTypeAdapterFactory.create(ReflectiveTypeAdapterFactory.java:72)
            at com.google.gson.Gson.getAdapter(Gson.java:356)
            at com.google.gson.internal.bind.ReflectiveTypeAdapterFactory$1.(ReflectiveTypeAdapterFactory.java:82)
            at com.google.gson.internal.bind.ReflectiveTypeAdapterFactory.createBoundField(ReflectiveTypeAdapterFactory.java:81)
            at com.google.gson.internal.bind.ReflectiveTypeAdapterFactory.getBoundFields(ReflectiveTypeAdapterFactory.java:118)
            at com.google.gson.internal.bind.ReflectiveTypeAdapterFactory.create(ReflectiveTypeAdapterFactory.java:72)

Here is my model:

@Table
public class Category extends BaseModel implements  Parcelable {

    public Category() {
        super();
    }

    @Column(columnType = Column.PRIMARY_KEY)
    @SerializedName("id")
    public int mId;

    @Column
    @SerializedName("pantone")
    public String mColor;

    @SerializedName("langs")
    public ArrayList mCategoryLanguageArrayList;

...

[agrosner]

This appears to be a GSON issue, not a DBFlow issue.

[rhespanhol]

Thanks for your quick answer.

But you know any workaround to fix this?

[agrosner]

looks good to me. I would debug GSON, and there is not much more I can do to help. Not that I don't want to, just I am not familiar with the library and not sure this error is a DBFlow issue.

[intrications]

@rhespanhol

I solved this by using Gson's @expose annotation.

Pass a custom Gson to Retrofit:

 Gson gson = new GsonBuilder()
                .excludeFieldsWithoutExposeAnnotation()
                .create();
 RestAdapter restAdapter = new RestAdapter.Builder()
                .setConverter(new GsonConverter(gson))
                .build();

Then add the @expose annotation to all your fields (that you want to deserialize) in your Model class.

Not sure why it works but it did.

[rhespanhol]

Thanks @intrications, it worked!!

@intrications Can you give an example please? It doesn't work for me :(

Gson gson = new GsonBuilder()
                .excludeFieldsWithoutExposeAnnotation()
                .create();
return new RestAdapter.Builder()
                .setLogLevel(RestAdapter.LogLevel.FULL)
                .setEndpoint(ApiEndpoint.QUICK_CLOUD_ROOT_API)
                .setRequestInterceptor(headers)
                .setClient(new ApacheClient(getNewHttpClient()))
                .setConverter(new GsonConverter(gson))
                .build();
In Model:

@Table(value = "user")
@ContainerAdapter
public class User extends BaseModel {

    @Expose
    @Column(columnType = Column.PRIMARY_KEY, name = "object_id")
    String objectId;

    @Expose
    @Column
    String name;

    @Expose
    @Column
    String email;

    @Expose
    @Column(name = "email_verified")
    boolean emailVerified;

    @Expose
    @Column(name = "created_at")
    String createdAt;

    @Expose
    @Column(name = "updated_at")
    String updatedAt;
}

Is something wrong? :(

[intrications]

What is ContainerAdapter? I didn't use that.
On 6 Mar 2015 18:11, "nambv" notifications@github.com wrote:

@intrications https://github.com/intrications Can you give an example
please? It doesn't work for me :(

Gson gson = new GsonBuilder()
.excludeFieldsWithoutExposeAnnotation()
.create();
return new RestAdapter.Builder()
.setLogLevel(RestAdapter.LogLevel.FULL)
.setEndpoint(ApiEndpoint.QUICK_CLOUD_ROOT_API)
.setRequestInterceptor(headers)
.setClient(new ApacheClient(getNewHttpClient()))
.setConverter(new GsonConverter(gson))
.build();
In Model:

@table(value = "user")
@ContainerAdapter
public class User extends BaseModel {

@Expose
@Column(columnType = Column.PRIMARY_KEY, name = "object_id")
String objectId;

@Expose
@Column
String name;

@Expose
@Column
String email;

@Expose
@Column(name = "email_verified")
boolean emailVerified;

@Expose
@Column(name = "created_at")
String createdAt;

@Expose
@Column(name = "updated_at")
String updatedAt;

}

Is something wrong? :(

—
Reply to this email directly or view it on GitHub
#121 (comment).

@intrications It's used to save model to database by calling method

model.save(false)

And thanks for your solution! Finally, It's work for me ^^

Gson gson = new GsonBuilder().excludeFieldsWithoutExposeAnnotation().create();
User user = gson.fromJson(result.getAsJsonObject(), User.class);
user.save(false);

[agrosner]

@nambv @intrications @ContainerAdapter is used to generate an adapter to work with ModelContainers. Rather than always generating it, I made it separated to cut down on generated code.

@agrosner Thank you very much for your explaination ^^!

[rjam]

Instead of force exposing all fields, you should get the same result just by letting Gson know that it should not try to serialize/deserialize the contents of the BaseModel class your models are extending (namely the ModelAdapter field it holds). Try creating your gson instance like this and you should no longer need to add the @Expose annotation to all fields:

Gson gson = new GsonBuilder()
                .setExclusionStrategies(new ExclusionStrategy() {
                    @Override
                    public boolean shouldSkipField(FieldAttributes f) {
                        return f.getDeclaredClass().equals(ModelAdapter.class);
                    }

                    @Override
                    public boolean shouldSkipClass(Class<?> clazz) {
                        return false;
                    }
                })
                .create();

[Rainer-Lang]

@rjam Many MANY THANKS!

[intrications]

@rjam Thanks for that. I wasn't sure exactly what it was in BaseModel that was causing the problem.