How to Serialize My User Class for the Firebase Database and Fix This Error

Firebase Serialization Issues [UPDATED]

This is happening because you have added in your User class the balance object which is of type BigDecimal. As in the official documentation regarding Firebase realtime databse data tyes, the BigDecimal is not a supported data type. To solve this, you should change te type of your balance object to a supported data type. I recommend you to change it to a Double.

Firebase No properties to serialize found on class

Firebase require your Pojo to have public variables or getter/setter.

Change variable declarations to public

public String nombre;
public String apellidos;
public String telefono;
public String email;
public Boolean tieneWhatsapp;
public Boolean tieneTelegram;
public Boolean tieneHangouts;
public Long formaPago;
public Double ratioHora;
public Double precioHora;
public Double horasCompensadas;

How do I fix this Firebase RunTime DB error where the entry into the database and authentication details are created but all the fields are null?

From the comments it sounds like createUserWithEmailAndPassword fails. When that happens, the task actually contains an exception with more information about the failure - but you're not handling that.

A better way to handle task failure is:

public void onComplete(@NonNull Task<Void> task) {
  if(task.isSuccessful()){
    ...
  }
  else{
    Toast.makeText(Register.this,"Failed to Register User", Toast.LENGTH_LONG).show();
    Log.e("Create user", "Failed to create user", task.getException());
  }
  progressBar.setVisibility(ViewStub.GONE);
}

With this, the cause of the task failure will show up in your logcat output.

com.google.firebase.database.DatabaseException: No properties to serialize found on class android.view.animation.AccelerateDecelerateInterpolator

Most Android classes, such as android.view.animation.AccelerateDecelerateInterpolator, cannot be written to the database without you writing custom code for that.

Your code will need to extract the important values from the AccelerateDecelerateInterpolator and write to to Firebase. Then when you read from the database, you'll have to create a AccelerateDecelerateInterpolator out of those properties again.

Also see:

• Firebase Android - Crash with "Found a conflicting setters with name: setGregorianChange" when .setValue() (where I gave a longer explanation)

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

I've managed to find the reason causing this crash. I installed the app on another device running Android 5.x and Firebase threw a much less confusing exception there:

com.google.firebase.database.DatabaseException: No properties to serialize found on class android.graphics.Paint$Align

It appeared that Firebase (unlike Gson) tries to serialize all possible getters even though they don't have direct connection with global variables (class members / fields), in my particular case one of my objects contained a method returning Drawable - getDrawable(). Obviously, Firebase doesn't know how to convert drawable into json.

Interesting moment (probably a bug in Firebase SDK): on my older device running Android 4.4.1 I still get my original exception in the same project and configuration:

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

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