Question

this is the error:

A JPA error occurred (Unable to build EntityManagerFactory): Could not determine type for: java.util.List, at table: Question, for columns: [org.hibernate.mapping.Column(Choices)]

i can’t understand the error i have used lists in other classes but they had relations to other classes, they had types of other classes but here i don’t understand why isn’t he seeing the type of the list

package models;


import play.*;
import play.db.jpa.*;

import javax.persistence.*;
import java.lang.reflect.Array;
import java.util.*;


@Entity
public class Question extends Model{
public String theQuestion;
public int marks;
public List<String> Choices;
@ManyToOne 
@JoinTable (name="questionInEexercise")
public Exercise myExercise;



public Question(String question,int marks,long Eid){
    this.theQuestion = question;
    this.marks = marks;
    this.myExercise = Exercise.findById(Eid);
    Choices = new ArrayList<String>();
}

Answer 1

JPA won’t know how to map your list of Strings correctly. You could map it with an ElementCollection so JPA would know how to handle it.