I have a Simple class named Questions which contain :

public class Questions {
String question,correctAns;
String[] incorretAns;

public Questions() {
}

public Questions(String question, String correctAns, String[] incorretAns) {
    this.question = question;
    this.correctAns = correctAns;
    this.incorretAns = incorretAns;
}

public String getQuestion() {
    return question;
}

public void setQuestion(String question) {
    this.question = question;
}

public String getCorrectAns() {
    return correctAns;
}

public void setCorrectAns(String correctAns) {
    this.correctAns = correctAns;
}

public String[] getIncorretAns() {
    return incorretAns;
}

public void setIncorretAns(String[] incorretAns) {
    this.incorretAns = incorretAns;
}

}

and I want to upload it as a List<Questions> questionsList list to firebase real-time database it is possible to upload!.

I have tried to upload it but the firebase real-time database gives an exception: something like this:

FirebaseDatabase.getInstance().getReference().child("Questions")
                        .child("randomID")
                        .setValue(questionsList);

And it gives Exception like this:

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

And there is any other way to upload this type of data any help will be appreciated!