gson: Android M: Cannot make field constructor accessible

D/Retrofit﹕java.lang.SecurityException: Can't make field constructor accessible
            at java.lang.reflect.Constructor.setAccessible(Constructor.java:334)
            at com.google.gson.internal.ConstructorConstructor.newDefaultConstructor(ConstructorConstructor.java:97)
            at com.google.gson.internal.ConstructorConstructor.get(ConstructorConstructor.java:79)
            at com.google.gson.internal.bind.ReflectiveTypeAdapterFactory.create(ReflectiveTypeAdapterFactory.java:82)
            at com.google.gson.Gson.getAdapter(Gson.java:359)
            at com.google.gson.internal.bind.CollectionTypeAdapterFactory.create(CollectionTypeAdapterFactory.java:52)
            at com.google.gson.Gson.getAdapter(Gson.java:359)
            at com.google.gson.internal.bind.ReflectiveTypeAdapterFactory.getFieldAdapter(ReflectiveTypeAdapterFactory.java:122)
            at com.google.gson.internal.bind.ReflectiveTypeAdapterFactory.access$100(ReflectiveTypeAdapterFactory.java:46)
            at com.google.gson.internal.bind.ReflectiveTypeAdapterFactory$1.<init>(ReflectiveTypeAdapterFactory.java:92)
            at com.google.gson.internal.bind.ReflectiveTypeAdapterFactory.createBoundField(ReflectiveTypeAdapterFactory.java:91)
            at com.google.gson.internal.bind.ReflectiveTypeAdapterFactory.getBoundFields(ReflectiveTypeAdapterFactory.java:142)
            at com.google.gson.internal.bind.ReflectiveTypeAdapterFactory.create(ReflectiveTypeAdapterFactory.java:83)
            at com.google.gson.Gson.getAdapter(Gson.java:359)
            at com.google.gson.internal.bind.ReflectiveTypeAdapterFactory.getFieldAdapter(ReflectiveTypeAdapterFactory.java:122)
            at com.google.gson.internal.bind.ReflectiveTypeAdapterFactory.access$100(ReflectiveTypeAdapterFactory.java:46)
            at com.google.gson.internal.bind.ReflectiveTypeAdapterFactory$1.<init>(ReflectiveTypeAdapterFactory.java:92)
            at com.google.gson.internal.bind.ReflectiveTypeAdapterFactory.createBoundField(ReflectiveTypeAdapterFactory.java:91)
            at com.google.gson.internal.bind.ReflectiveTypeAdapterFactory.getBoundFields(ReflectiveTypeAdapterFactory.java:142)
            at com.google.gson.internal.bind.ReflectiveTypeAdapterFactory.create(ReflectiveTypeAdapterFactory.java:83)
            at com.google.gson.Gson.getAdapter(Gson.java:359)
            at com.google.gson.internal.bind.CollectionTypeAdapterFactory.create(CollectionTypeAdapterFactory.java:52)
            at com.google.gson.Gson.getAdapter(Gson.java:359)
            at com.google.gson.internal.bind.ReflectiveTypeAdapterFactory.getFieldAdapter(ReflectiveTypeAdapterFactory.java:122)
            at com.google.gson.internal.bind.ReflectiveTypeAdapterFactory.access$100(ReflectiveTypeAdapterFactory.java:46)
            at com.google.gson.internal.bind.ReflectiveTypeAdapterFactory$1.<init>(ReflectiveTypeAdapterFactory.java:92)
            at com.google.gson.internal.bind.ReflectiveTypeAdapterFactory.createBoundField(ReflectiveTypeAdapterFactory.java:91)
            at com.google.gson.internal.bind.ReflectiveTypeAdapterFactory.getBoundFields(ReflectiveTypeAdapterFactory.java:142)
            at com.google.gson.internal.bind.ReflectiveTypeAdapterFactory.create(ReflectiveTypeAdapterFactory.java:83)
            at com.google.gson.Gson.getAdapter(Gson.java:359)
            at com.google.gson.Gson.fromJson(Gson.java:809)
            at com.google.gson.Gson.fromJson(Gson.java:775)
            at retrofit.converter.GsonConverter.fromBody(GsonConverter.java:63)
            at retrofit.RestAdapter$RestHandler.invokeRequest(RestAdapter.java:367)
            at retrofit.RestAdapter$RestHandler.access$100(RestAdapter.java:220)
            at retrofit.RestAdapter$RestHandler$2.obtainResponse(RestAdapter.java:278)
            at retrofit.CallbackRunnable.run(CallbackRunnable.java:42)
            at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1113)
            at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:588)
            at retrofit.Platform$Android$2$1.run(Platform.java:142)
            at java.lang.Thread.run(Thread.java:818)

Originally filed at https://github.com/square/retrofit/issues/870.

Note: this might be a bug in the preview OS runtime and not Gson, but it’s definitely not a Retrofit problem.

About this issue

Original URL
State: closed
Created 9 years ago
Comments: 39 (4 by maintainers)

Commits related to this issue

fix: fixed bug causing movies not to be saved in database in API 23 and above. Th issue was related to the GSON library as discussed under - https://github.com/google/gson/issues/648 — committed to RowlandOti/MovieSquire by RowlandOti 7 years ago

Most upvoted comments

@jirivrany excludeFieldsWithoutExposeAnnotation()work for me

malinkang on Mar 30, 2016

I am using Retrofit and GSON in a project and only encountered this issue on Android M after replacing SugarORM with ActiveAndroid.

nBollard on Sep 23, 2015

👍 to excludeFieldsWithModifiers(Modifier.FINAL, Modifier.TRANSIENT, Modifier.STATIC)

rafaelcgo on Mar 17, 2016

You can try adding GsonConverter

new GsonConverter(new GsonBuilder()
                .excludeFieldsWithModifiers(Modifier.FINAL, Modifier.TRANSIENT, Modifier.STATIC)
                .serializeNulls()
                .create())

In your RestAdapter.Builder()

RestAdapter.Builder()
                .setConverter(new GsonConverter(new GsonBuilder()
                        .excludeFieldsWithModifiers(Modifier.FINAL, Modifier.TRANSIENT, Modifier.STATIC)
                        .serializeNulls()
                        .create()))
                .setEndpoint(endPoint)
                .build()

saleehk on Aug 24, 2015

I’m using Retrofit+ Gson + ActiveAndroid

GsonBuilder builder = new GsonBuilder(); builder.excludeFieldsWithModifiers(Modifier.FINAL, Modifier.TRANSIENT, Modifier.STATIC); Gson gson = builder.create();

worked for me

AnthonyKoueik on Oct 13, 2016

I’m using OkHttp + Gson + ActiveAndroid

GsonBuilder builder = new GsonBuilder();
builder.excludeFieldsWithModifiers(Modifier.FINAL, Modifier.TRANSIENT, Modifier.STATIC);
Gson gson = builder.create();

work for me

quydm on Jul 27, 2016

I use Gson’s ExclusionStrategy to skip java.lang.reflect.Field and java.lang.reflect.Method, my simple demo.

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);

    String json = "{\"name\": \"Ricky\", \"age\": 25}";

    ExclusionStrategy exclusionStrategy = new ExclusionStrategy() {

        @Override
        public boolean shouldSkipField(FieldAttributes fieldAttributes) {
            return false;
        }

        @Override
        public boolean shouldSkipClass(Class<?> clazz) {
            return clazz == Field.class || clazz == Method.class;
        }
    };

    Gson gson = new GsonBuilder()
            .addSerializationExclusionStrategy(exclusionStrategy)
            .addDeserializationExclusionStrategy(exclusionStrategy)
            .create();

    // Student is a simple class extends com.activeandroid.Model
    Student student = gson.fromJson(json, Student.class);
    student.save();

    List<Student> students = new Select().from(Student.class).execute();
    if (students != null && students.size() > 0) {
        Student stu = students.get(0);
        Log.d("zlx", stu.name + "'s age: " + stu.age);
    }
}

zhenglingxiao on Feb 24, 2016

@AeroEchelon I was trying to use ActiveAndroid and Gson and my workaround is fine for parsing the data with gson, but when I try to save fields that have relationships it doesnt work.

arlindiDev on Feb 22, 2016

I had the same issue. I’m using Gson with Retrofit and ActiveAndroid.

The solution with

excludeFieldsWithoutExposeAnnotation()

suggested by @aat-antoine works for me.

jirivrany on Nov 13, 2015