Firebase - realtime database set additional value to user throws exception

Question

I have class User which has additional info, but it is throwing:

com.google.firebase.database.DatabaseException: Serializing Collections is not supported, please use Lists instead

My code is:

User user = new User(Gender.valueOf(mGenderSpinner.getSelectedItem().toString()));
                            Log.d("GENDER", user.getGender().toString());
                            mFirebaseDatabase.getReference("Users")
                                    .child(mAuth.getCurrentUser().getUid())
                                    .setValue(user)

The question is how I can still set User.class value or this is not possible?

Possible duplicate of com.google.firebase.database.DatabaseException: Serializing Arrays is not supported, please use Lists instead — Martin Zeitler
– Martin Zeitler, Commented Aug 12, 2018 at 23:13

Alex Mamo · Accepted Answer · 2021-05-24 09:10:51Z

1

Value type ordering

Null values
Boolean values
Integer and floating-point values, sorted in numerical order
Date values
Text string values
Byte values
Cloud Firestore references
Geographical point values
Array values
Map values

com.google.firebase.database.DatabaseException: Serializing Collections is not supported, please use Lists instead

Above Exception show that you have unsupported Collections object on User class just change with one of above supported type ex. List<Type>.

Update

Thanks to Alex Mamo comment,

Above is Data Types is for Firebase Cloud Database, But Firebase Realtime Database as following.
Pass types that correspond to the available JSON types as follows:
String
Long
Double
Boolean
Map<String, Object>
List

edited May 24, 2021 at 9:10

Alex Mamo

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answered Aug 12, 2018 at 22:38

Khaled Lela

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