Android Firebase 2.4 IllegalStateException using new ref.updateChildren()

Question

When using Firebase 2.4 ref.updateChildren() with HashMap, other than HashMap (e.g. HashMap)

Answer 1

On your last question:

Is there a way to pass custom HashMap like HashMap to ref.updateChildren() ?

The Firebase SDK for Android/Java doesn't support directly passing POJOs (like your User class) into updateChildren().

But what you can do is convert the POJO into a Map with:

Map userMap = new ObjectMapper().convertValue(user, Map.class);

Then you can put the map of values into the values that you're passing into updateChildren():

updates.put("users/"+uid, userMap);
updates.put("lists/"+uid+"/mine, "value");

ref.updateChildren(updates);