端點方法中的堆棧溢出錯誤

Question

我正在使用端點開發由谷歌應用引擎驅動的 android 應用程序，在我編寫的 api 中，我一直無緣無故地收到堆棧溢出錯誤。

到目前為止，這里是我的端點 api 類中的 2 個方法：

@ApiMethod(name = "saveProfile")
public Profile saveProfile(@Named("userId") String userId,
                               @Named("firstName") String firstName,
                               @Named("lastName") String lastName,
                               @Named("birthday") String birthday) {

        Profile profile = ofy().load().key(Key.create(Profile.class, userId)).now();
        if (profile == null) {
            profile = new Profile(userId, firstName, lastName, birthday);
        } else {
            profile.updateProfile(firstName, lastName, birthday);
        }
        ofy().save().entity(profile).now();
        return profile;
    }

@ApiMethod(name = "getSuggestedFriends")
public List<Profile> getSuggestedFriends(@Named("userId") String userId) {

    Profile profile = ofy().load().key(Key.create(Profile.class, userId)).now();
    if (profile != null) {
        /**
         * Queries for users with same last name as you (presumably family).
         */
        Query<Profile> sameLastName = ofy().load().type(Profile.class).order("birthday");
        sameLastName = sameLastName.filter("lastName =", profile.getLastName());

        /**
         * Gets the friends of your friends.
         */
        List<Profile> suggestedFriends = new ArrayList<>(0);
        for (Profile friend : profile.getFriends()) {
            for (Profile friendOfFriend : friend.getFriends()) {
                if (!profile.getFriends().contains(friendOfFriend))
                    suggestedFriends.add(friendOfFriend);
            }
        }

        /**
         * Merge the 2 lists into 1 list of suggested friends.
         */
        for (Profile suggestedFriend : sameLastName) {
            if (!profile.getFriends().contains(suggestedFriend))
                suggestedFriends.add(suggestedFriend);
        }
        return suggestedFriends;
    } else
        return null;
}

有人可以就這種情況發生的原因提供一些見解和解決方案嗎？

編輯：

大多數堆棧跟蹤（很長）：

java.lang.StackOverflowError
    at java.util.AbstractCollection.toArray(AbstractCollection.java:176)
    at sun.reflect.annotation.AnnotationParser.toArray(AnnotationParser.java:865)
    at java.lang.reflect.Field.getDeclaredAnnotations(Field.java:1139)
    at java.lang.reflect.AccessibleObject.getAnnotations(AccessibleObject.java:207)
    at com.googlecode.objectify.impl.FieldProperty.<init>(FieldProperty.java:36)
    at com.googlecode.objectify.impl.KeyMetadata.findKeyFields(KeyMetadata.java:77)
    at com.googlecode.objectify.impl.KeyMetadata.<init>(KeyMetadata.java:50)
    at com.googlecode.objectify.impl.translate.ClassTranslatorFactory.createEntityClassTranslator(ClassTranslatorFactory.java:64)
    at com.googlecode.objectify.impl.translate.ClassTranslatorFactory.create(ClassTranslatorFactory.java:48)
    at com.googlecode.objectify.impl.translate.ClassTranslatorFactory.create(ClassTranslatorFactory.java:36)
    at com.googlecode.objectify.impl.translate.Translators.create(Translators.java:138)
    at com.googlecode.objectify.impl.translate.Translators.get(Translators.java:117)
    at com.googlecode.objectify.impl.translate.CreateContext.getTranslator(CreateContext.java:27)
    at com.googlecode.objectify.impl.translate.CollectionTranslatorFactory.create(CollectionTranslatorFactory.java:38)
    at com.googlecode.objectify.impl.translate.Translators.create(Translators.java:138)
    at com.googlecode.objectify.impl.translate.Translators.get(Translators.java:117)
    at com.googlecode.objectify.impl.translate.CreateContext.getTranslator(CreateContext.java:27)
    at com.googlecode.objectify.impl.translate.ClassPopulator.<init>(ClassPopulator.java:88)
    at com.googlecode.objectify.impl.translate.ClassTranslatorFactory.createEntityClassTranslator(ClassTranslatorFactory.java:66)
    at com.googlecode.objectify.impl.translate.ClassTranslatorFactory.create(ClassTranslatorFactory.java:48)
    at com.googlecode.objectify.impl.translate.ClassTranslatorFactory.create(ClassTranslatorFactory.java:36)
    at com.googlecode.objectify.impl.translate.Translators.create(Translators.java:138)
    at com.googlecode.objectify.impl.translate.Translators.get(Translators.java:117)
    at com.googlecode.objectify.impl.translate.CreateContext.getTranslator(CreateContext.java:27)
    at com.googlecode.objectify.impl.translate.CollectionTranslatorFactory.create(CollectionTranslatorFactory.java:38)
    at com.googlecode.objectify.impl.translate.Translators.create(Translators.java:138)
    at com.googlecode.objectify.impl.translate.Translators.get(Translators.java:117)
    at com.googlecode.objectify.impl.translate.CreateContext.getTranslator(CreateContext.java:27)
    at com.googlecode.objectify.impl.translate.ClassPopulator.<init>(ClassPopulator.java:88)
    at com.googlecode.objectify.impl.translate.ClassTranslatorFactory.createEntityClassTranslator(ClassTranslatorFactory.java:66)
    at com.googlecode.objectify.impl.translate.ClassTranslatorFactory.create(ClassTranslatorFactory.java:48)
    at com.googlecode.objectify.impl.translate.ClassTranslatorFactory.create(ClassTranslatorFactory.java:36)
    at com.googlecode.objectify.impl.translate.Translators.create(Translators.java:138)
    at com.googlecode.objectify.impl.translate.Translators.get(Translators.java:117)
    at com.googlecode.objectify.impl.translate.CreateContext.getTranslator(CreateContext.java:27)
    at com.googlecode.objectify.impl.translate.CollectionTranslatorFactory.create(CollectionTranslatorFactory.java:38)
    at com.googlecode.objectify.impl.translate.Translators.create(Translators.java:138)
    at com.googlecode.objectify.impl.translate.Translators.get(Translators.java:117)
    at com.googlecode.objectify.impl.translate.CreateContext.getTranslator(CreateContext.java:27)
    at com.googlecode.objectify.impl.translate.ClassPopulator.<init>(ClassPopulator.java:88)
    at com.googlecode.objectify.impl.translate.ClassTranslatorFactory.createEntityClassTranslator(ClassTranslatorFactory.java:66)
    at com.googlecode.objectify.impl.translate.ClassTranslatorFactory.create(ClassTranslatorFactory.java:48)
    at com.googlecode.objectify.impl.translate.ClassTranslatorFactory.create(ClassTranslatorFactory.java:36)
    at com.googlecode.objectify.impl.translate.Translators.create(Translators.java:138)
    at com.googlecode.objectify.impl.translate.Translators.get(Translators.java:117)
    at com.googlecode.objectify.impl.translate.CreateContext.getTranslator(CreateContext.java:27)
    at com.googlecode.objectify.impl.translate.CollectionTranslatorFactory.create(CollectionTranslatorFactory.java:38)
    at com.googlecode.objectify.impl.translate.Translators.create(Translators.java:138)
    at com.googlecode.objectify.impl.translate.Translators.get(Translators.java:117)
    at com.googlecode.objectify.impl.translate.CreateContext.getTranslator(CreateContext.java:27)
    at com.googlecode.objectify.impl.translate.ClassPopulator.<init>(ClassPopulator.java:88)
    at com.googlecode.objectify.impl.translate.ClassTranslatorFactory.createEntityClassTranslator(ClassTranslatorFactory.java:66)
    at com.googlecode.objectify.impl.translate.ClassTranslatorFactory.create(ClassTranslatorFactory.java:48)
    at com.googlecode.objectify.impl.translate.ClassTranslatorFactory.create(ClassTranslatorFactory.java:36)
    at com.googlecode.objectify.impl.translate.Translators.create(Translators.java:138)
    at com.googlecode.objectify.impl.translate.Translators.get(Translators.java:117)
    at com.googlecode.objectify.impl.translate.CreateContext.getTranslator(CreateContext.java:27)
    at com.googlecode.objectify.impl.translate.CollectionTranslatorFactory.create(CollectionTranslatorFactory.java:38)
    at com.googlecode.objectify.impl.translate.Translators.create(Translators.java:138)
    at com.googlecode.objectify.impl.translate.Translators.get(Translators.java:117)
    at com.googlecode.objectify.impl.translate.CreateContext.getTranslator(CreateContext.java:27)
    at com.googlecode.objectify.impl.translate.ClassPopulator.<init>(ClassPopulator.java:88)
    at com.googlecode.objectify.impl.translate.ClassTranslatorFactory.createEntityClassTranslator(ClassTranslatorFactory.java:66)
    at com.googlecode.objectify.impl.translate.ClassTranslatorFactory.create(ClassTranslatorFactory.java:48)
    at com.googlecode.objectify.impl.translate.ClassTranslatorFactory.create(ClassTranslatorFactory.java:36)
    at com.googlecode.objectify.impl.translate.Translators.create(Translators.java:138)
    at com.googlecode.objectify.impl.translate.Translators.get(Translators.java:117)
    at com.googlecode.objectify.impl.translate.CreateContext.getTranslator(CreateContext.java:27)
    at com.googlecode.objectify.impl.translate.CollectionTranslatorFactory.create(CollectionTranslatorFactory.java:38)
    at com.googlecode.objectify.impl.translate.Translators.create(Translators.java:138)
    at com.googlecode.objectify.impl.translate.Translators.get(Translators.java:117)
    at com.googlecode.objectify.impl.translate.CreateContext.getTranslator(CreateContext.java:27)
    at com.googlecode.objectify.impl.translate.ClassPopulator.<init>(ClassPopulator.java:88)
    at com.googlecode.objectify.impl.translate.ClassTranslatorFactory.createEntityClassTranslator(ClassTranslatorFactory.java:66)
    at com.googlecode.objectify.impl.translate.ClassTranslatorFactory.create(ClassTranslatorFactory.java:48)
    at com.googlecode.objectify.impl.translate.ClassTranslatorFactory.create(ClassTranslatorFactory.java:36)
    at com.googlecode.objectify.impl.translate.Translators.create(Translators.java:138)
    at com.googlecode.objectify.impl.translate.Translators.get(Translators.java:117)
    at com.googlecode.objectify.impl.translate.CreateContext.getTranslator(CreateContext.java:27)
    at com.googlecode.objectify.impl.translate.CollectionTranslatorFactory.create(CollectionTranslatorFactory.java:38)
    at com.googlecode.objectify.impl.translate.Translators.create(Translators.java:138)
    at com.googlecode.objectify.impl.translate.Translators.get(Translators.java:117)
    at com.googlecode.objectify.impl.translate.CreateContext.getTranslator(CreateContext.java:27)
    at com.googlecode.objectify.impl.translate.ClassPopulator.<init>(ClassPopulator.java:88)
    at com.googlecode.objectify.impl.translate.ClassTranslatorFactory.createEntityClassTranslator(ClassTranslatorFactory.java:66)
    at com.googlecode.objectify.impl.translate.ClassTranslatorFactory.create(ClassTranslatorFactory.java:48)
    at com.googlecode.objectify.impl.translate.ClassTranslatorFactory.create(ClassTranslatorFactory.java:36)
    at com.googlecode.objectify.impl.translate.Translators.create(Translators.java:138)
    at com.googlecode.objectify.impl.translate.Translators.get(Translators.java:117)
    at com.googlecode.objectify.impl.translate.CreateContext.getTranslator(CreateContext.java:27)
    at com.googlecode.objectify.impl.translate.CollectionTranslatorFactory.create(CollectionTranslatorFactory.java:38)
    at com.googlecode.objectify.impl.translate.Translators.create(Translators.java:138)
    at com.googlecode.objectify.impl.translate.Translators.get(Translators.java:117)
    at com.googlecode.objectify.impl.translate.CreateContext.getTranslator(CreateContext.java:27)
    at com.googlecode.objectify.impl.translate.ClassPopulator.<init>(ClassPopulator.java:88)
    at com.googlecode.objectify.impl.translate.ClassTranslatorFactory.createEntityClassTranslator(ClassTranslatorFactory.java:66)
    at com.googlecode.objectify.impl.translate.ClassTranslatorFactory.create(ClassTranslatorFactory.java:48)
    at com.googlecode.objectify.impl.translate.ClassTranslatorFactory.create(ClassTranslatorFactory.java:36)
    at com.googlecode.objectify.impl.translate.Translators.create(Translators.java:138)
    at com.googlecode.objectify.impl.translate.Translators.get(Translators.java:117)
    at com.googlecode.objectify.impl.translate.CreateContext.getTranslator(CreateContext.java:27)
    at com.googlecode.objectify.impl.translate.CollectionTranslatorFactory.create(CollectionTranslatorFactory.java:38)
    at com.googlecode.objectify.impl.translate.Translators.create(Translators.java:138)
    at com.googlecode.objectify.impl.translate.Translators.get(Translators.java:117)
    at com.googlecode.objectify.impl.translate.CreateContext.getTranslator(CreateContext.java:27)
    at com.googlecode.objectify.impl.translate.ClassPopulator.<init>(ClassPopulator.java:88)
    at com.googlecode.objectify.impl.translate.ClassTranslatorFactory.createEntityClassTranslator(ClassTranslatorFactory.java:66)
    at com.googlecode.objectify.impl.translate.ClassTranslatorFactory.create(ClassTranslatorFactory.java:48)
    at com.googlecode.objectify.impl.translate.ClassTranslatorFactory.create(ClassTranslatorFactory.java:36)
    at com.googlecode.objectify.impl.translate.Translators.create(Translators.java:138)
    at com.googlecode.objectify.impl.translate.Translators.get(Translators.java:117)
    at com.googlecode.objectify.impl.translate.CreateContext.getTranslator(CreateContext.java:27)
    at com.googlecode.objectify.impl.translate.CollectionTranslatorFactory.create(CollectionTranslatorFactory.java:38)
    at com.googlecode.objectify.impl.translate.Translators.create(Translators.java:138)
    at com.googlecode.objectify.impl.translate.Translators.get(Translators.java:117)
    at com.googlecode.objectify.impl.translate.CreateContext.getTranslator(CreateContext.java:27)
    at com.googlecode.objectify.impl.translate.ClassPopulator.<init>(ClassPopulator.java:88)
    at com.googlecode.objectify.impl.translate.ClassTranslatorFactory.createEntityClassTranslator(ClassTranslatorFactory.java:66)
    at com.googlecode.objectify.impl.translate.ClassTranslatorFactory.create(ClassTranslatorFactory.java:48)
    at com.googlecode.objectify.impl.translate.ClassTranslatorFactory.create(ClassTranslatorFactory.java:36)
    at com.googlecode.objectify.impl.translate.Translators.create(Translators.java:138)
    at com.googlecode.objectify.impl.translate.Translators.get(Translators.java:117)
    at com.googlecode.objectify.impl.translate.CreateContext.getTranslator(CreateContext.java:27)
    at com.googlecode.objectify.impl.translate.CollectionTranslatorFactory.create(CollectionTranslatorFactory.java:38)
    at com.googlecode.objectify.impl.translate.Translators.create(Translators.java:138)
    at com.googlecode.objectify.impl.translate.Translators.get(Translators.java:117)
    at com.googlecode.objectify.impl.translate.CreateContext.getTranslator(CreateContext.java:27)
    at com.googlecode.objectify.impl.translate.ClassPopulator.<init>(ClassPopulator.java:88)
    at com.googlecode.objectify.impl.translate.ClassTranslatorFactory.createEntityClassTranslator(ClassTranslatorFactory.java:66)
    at com.googlecode.objectify.impl.translate.ClassTranslatorFactory.create(ClassTranslatorFactory.java:48)
    at com.googlecode.objectify.impl.translate.ClassTranslatorFactory.create(ClassTranslatorFactory.java:36)
    at com.googlecode.objectify.impl.translate.Translators.create(Translators.java:138)
    at com.googlecode.objectify.impl.translate.Translators.get(Translators.java:117)
    at com.googlecode.objectify.impl.translate.CreateContext.getTranslator(CreateContext.java:27)
    at com.googlecode.objectify.impl.translate.CollectionTranslatorFactory.create(CollectionTranslatorFactory.java:38)
    at com.googlecode.objectify.impl.translate.Translators.create(Translators.java:138)
    at com.googlecode.objectify.impl.translate.Translators.get(Translators.java:117)
    at com.googlecode.objectify.impl.translate.CreateContext.getTranslator(CreateContext.java:27)
    at com.googlecode.objectify.impl.translate.ClassPopulator.<init>(ClassPopulator.java:88)
    at com.googlecode.objectify.impl.translate.ClassTranslatorFactory.createEntityClassTranslator(ClassTranslatorFactory.java:66)
    at com.googlecode.objectify.impl.translate.ClassTranslatorFactory.create(ClassTranslatorFactory.java:48)
    at com.googlecode.objectify.impl.translate.ClassTranslatorFactory.create(ClassTranslatorFactory.java:36)
    at com.googlecode.objectify.impl.translate.Translators.create(Translators.java:138)
    at com.googlecode.objectify.impl.translate.Translators.get(Translators.java:117)
    at com.googlecode.objectify.impl.translate.CreateContext.getTranslator(CreateContext.java:27)
    at com.googlecode.objectify.impl.translate.CollectionTranslatorFactory.create(CollectionTranslatorFactory.java:38)
    at com.googlecode.objectify.impl.translate.Translators.create(Translators.java:138)
    at com.googlecode.objectify.impl.translate.Translators.get(Translators.java:117)
    at com.googlecode.objectify.impl.translate.CreateContext.getTranslator(CreateContext.java:27)
    at com.googlecode.objectify.impl.translate.ClassPopulator.<init>(ClassPopulator.java:88)
    at com.googlecode.objectify.impl.translate.ClassTranslatorFactory.createEntityClassTranslator(ClassTranslatorFactory.java:66)
    at com.googlecode.objectify.impl.translate.ClassTranslatorFactory.create(ClassTranslatorFactory.java:48)
    at com.googlecode.objectify.impl.translate.ClassTranslatorFactory.create(ClassTranslatorFactory.java:36)
    at com.googlecode.objectify.impl.translate.Translators.create(Translators.java:138)
    at com.googlecode.objectify.impl.translate.Translators.get(Translators.java:117)
    at com.googlecode.objectify.impl.translate.CreateContext.getTranslator(CreateContext.java:27)
    at com.googlecode.objectify.impl.translate.CollectionTranslatorFactory.create(CollectionTranslatorFactory.java:38)
    at com.googlecode.objectify.impl.translate.Translators.create(Translators.java:138)
    at com.googlecode.objectify.impl.translate.Translators.get(Translators.java:117)
    at com.googlecode.objectify.impl.translate.CreateContext.getTranslator(CreateContext.java:27)
    at com.googlecode.objectify.impl.translate.ClassPopulator.<init>(ClassPopulator.java:88)
    at com.googlecode.objectify.impl.translate.ClassTranslatorFactory.createEntityClassTranslator(ClassTranslatorFactory.java:66)
    at com.googlecode.objectify.impl.translate.ClassTranslatorFactory.create(ClassTranslatorFactory.java:48)
    at com.googlecode.objectify.impl.translate.ClassTranslatorFactory.create(ClassTranslatorFactory.java:36)
    at com.googlecode.objectify.impl.translate.Translators.create(Translators.java:138)
    at com.googlecode.objectify.impl.translate.Translators.get(Translators.java:117)
    at com.googlecode.objectify.impl.translate.CreateContext.getTranslator(CreateContext.java:27)
    at com.googlecode.objectify.impl.translate.CollectionTranslatorFactory.create(CollectionTranslatorFactory.java:38)
    at com.googlecode.objectify.impl.translate.Translators.create(Translators.java:138)
    at com.googlecode.objectify.impl.translate.Translators.get(Translators.java:117)
    at com.googlecode.objectify.impl.translate.CreateContext.getTranslator(CreateContext.java:27)
    at com.googlecode.objectify.impl.translate.ClassPopulator.<init>(ClassPopulator.java:88)
    at com.googlecode.objectify.impl.translate.ClassTranslatorFactory.createEntityClassTranslator(ClassTranslatorFactory.java:66)
    at com.googlecode.objectify.impl.translate.ClassTranslatorFactory.create(ClassTranslatorFactory.java:48)
    at com.googlecode.objectify.impl.translate.ClassTranslatorFactory.create(ClassTranslatorFactory.java:36)
    at com.googlecode.objectify.impl.translate.Translators.create(Translators.java:138)
    at com.googlecode.objectify.impl.translate.Translators.get(Translators.java:117)
    at com.googlecode.objectify.impl.translate.CreateContext.getTranslator(CreateContext.java:27)
    at com.googlecode.objectify.impl.translate.CollectionTranslatorFactory.create(CollectionTranslatorFactory.java:38)
    at com.googlecode.objectify.impl.translate.Translators.create(Translators.java:138)
    at com.googlecode.objectify.impl.translate.Translators.get(Translators.java:117)
    at com.googlecode.objectify.impl.translate.CreateContext.getTranslator(CreateContext.java:27)
    at com.googlecode.objectify.impl.translate.ClassPopulator.<init>(ClassPopulator.java:88)
    at com.googlecode.objectify.impl.translate.ClassTranslatorFactory.createEntityClassTranslator(ClassTranslatorFactory.java:66)
    at com.googlecode.objectify.impl.translate.ClassTranslatorFactory.create(ClassTranslatorFactory.java:48)
    at com.googlecode.objectify.impl.translate.ClassTranslatorFactory.create(ClassTranslatorFactory.java:36)
    at com.googlecode.objectify.impl.translate.Translators.create(Translators.java:138)
    at com.googlecode.objectify.impl.translate.Translators.get(Translators.java:117)
    at com.googlecode.objectify.impl.translate.CreateContext.getTranslator(CreateContext.java:27)
    at com.googlecode.objectify.impl.translate.CollectionTranslatorFactory.create(CollectionTranslatorFactory.java:38)
    at com.googlecode.objectify.impl.translate.Translators.create(Translators.java:138)
    at com.googlecode.objectify.impl.translate.Translators.get(Translators.java:117)
    at com.googlecode.objectify.impl.translate.CreateContext.getTranslator(CreateContext.java:27)
    at com.googlecode.objectify.impl.translate.ClassPopulator.<init>(ClassPopulator.java:88)
    at com.googlecode.objectify.impl.translate.ClassTranslatorFactory.createEntityClassTranslator(ClassTranslatorFactory.java:66)
    at com.googlecode.objectify.impl.translate.ClassTranslatorFactory.create(ClassTranslatorFactory.java:48)
    at com.googlecode.objectify.impl.translate.ClassTranslatorFactory.create(ClassTranslatorFactory.java:36)
    at com.googlecode.objectify.impl.translate.Translators.create(Translators.java:138)
    at com.googlecode.objectify.impl.translate.Translators.get(Translators.java:117)
    at com.googlecode.objectify.impl.translate.CreateContext.getTranslator(CreateContext.java:27)
    at com.googlecode.objectify.impl.translate.CollectionTranslatorFactory.create(CollectionTranslatorFactory.java:38)
    at com.googlecode.objectify.impl.translate.Translators.create(Translators.java:138)
    at com.googlecode.objectify.impl.translate.Translators.get(Translators.java:117)
    at com.googlecode.objectify.impl.translate.CreateContext.getTranslator(CreateContext.java:27)
    at com.googlecode.objectify.impl.translate.ClassPopulator.<init>(ClassPopulator.java:88)
    at com.googlecode.objectify.impl.translate.ClassTranslatorFactory.createEntityClassTranslator(ClassTranslatorFactory.java:66)
    at com.googlecode.objectify.impl.translate.ClassTranslatorFactory.create(ClassTranslatorFactory.java:48)
    at com.googlecode.objectify.impl.translate.ClassTranslatorFactory.create(ClassTranslatorFactory.java:36)
    at com.googlecode.objectify.impl.translate.Translators.create(Translators.java:138)
    at com.googlecode.objectify.impl.translate.Translators.get(Translators.java:117)
    at com.googlecode.objectify.impl.translate.CreateContext.getTranslator(CreateContext.java:27)
    at com.googlecode.objectify.impl.translate.CollectionTranslatorFactory.create(CollectionTranslatorFactory.java:38)
    at com.googlecode.objectify.impl.translate.Translators.create(Translators.java:138)
    at com.googlecode.objectify.impl.translate.Translators.get(Translators.java:117)
    at com.googlecode.objectify.impl.translate.CreateContext.getTranslator(CreateContext.java:27)
    at com.googlecode.objectify.impl.translate.ClassPopulator.<init>(ClassPopulator.java:88)
    at com.googlecode.objectify.impl.translate.ClassTranslatorFactory.createEntityClassTranslator(ClassTranslatorFactory.java:66)
    at com.googlecode.objectify.impl.translate.ClassTranslatorFactory.create(ClassTranslatorFactory.java:48)
    at com.googlecode.objectify.impl.translate.ClassTranslatorFactory.create(ClassTranslatorFactory.java:36)
    at com.googlecode.objectify.impl.translate.Translators.create(Translators.java:138)
    at com.googlecode.objectify.impl.translate.Translators.get(Translators.java:117)
    at com.googlecode.objectify.impl.translate.CreateContext.getTranslator(CreateContext.java:27)
    at com.googlecode.objectify.impl.translate.CollectionTranslatorFactory.create(CollectionTranslatorFactory.java:38)
    at com.googlecode.objectify.impl.translate.Translators.create(Translators.java:138)
    at com.googlecode.objectify.impl.translate.Translators.get(Translators.java:117)
    at com.googlecode.objectify.impl.translate.CreateContext.getTranslator(CreateContext.java:27)
    at com.googlecode.objectify.impl.translate.ClassPopulator.<init>(ClassPopulator.java:88)
    at com.googlecode.objectify.impl.translate.ClassTranslatorFactory.createEntityClassTranslator(ClassTranslatorFactory.java:66)
    at com.googlecode.objectify.impl.translate.ClassTranslatorFactory.create(ClassTranslatorFactory.java:48)
    at com.googlecode.objectify.impl.translate.ClassTranslatorFactory.create(ClassTranslatorFactory.java:36)
    at com.googlecode.objectify.impl.translate.Translators.create(Translators.java:138)
    at com.googlecode.objectify.impl.translate.Translators.get(Translators.java:117)
    at com.googlecode.objectify.impl.translate.CreateContext.getTranslator(CreateContext.java:27)
    at com.googlecode.objectify.impl.translate.CollectionTranslatorFactory.create(CollectionTranslatorFactory.java:38)
    at com.googlecode.objectify.impl.translate.Translators.create(Translators.java:138)
    at com.googlecode.objectify.impl.translate.Translators.get(Translators.java:117)
    at com.googlecode.objectify.impl.translate.CreateContext.getTranslator(CreateContext.java:27)
    at com.googlecode.objectify.impl.translate.ClassPopulator.<init>(ClassPopulator.java:88)
    at com.googlecode.objectify.impl.translate.ClassTranslatorFactory.createEntityClassTranslator(ClassTranslatorFactory.java:66)
    at com.googlecode.objectify.impl.translate.ClassTranslatorFactory.create(ClassTranslatorFactory.java:48)
    at com.googlecode.objectify.impl.translate.ClassTranslatorFactory.create(ClassTranslatorFactory.java:36)
    at com.googlecode.objectify.impl.translate.Translators.create(Translators.java:138)
    at com.googlecode.objectify.impl.translate.Translators.get(Translators.java:117)
    at com.googlecode.objectify.impl.translate.CreateContext.getTranslator(CreateContext.java:27)
    at com.googlecode.objectify.impl.translate.CollectionTranslatorFactory.create(CollectionTranslatorFactory.java:38)
    at com.googlecode.objectify.impl.translate.Translators.create(Translators.java:138)

干杯。

Answer 1

在這種情況下會發生這種情況：

public class Entity
{
    private List<Entity> children;
}

根據您的情況，您可以嘗試@Serialize'ing children。