Design patterns one to many and left outer join

I've got two tables, and, of course, 2 JavaBeans.

Table A 
id     name     desc
1      John     Malcom
2      Steve    Jobs
3      Mark     The Best

Table B
id     thing     fk_A_id (many to one)
1      Bag       1
2      Pet       1
3      Ball      2

In java I have this classes:

class A {
    private int id;
    private String name, desc;
    private List<B> bList;
    //getters and setters

}

class B {
    private int id;
    private String thing;
    private int fkA;
}

I have to do a DAO which obtain data from these tables. In the view I have to show data like a sql left outer join between A and B tables, which returns a JSON object, something like this

Aid    Aname   Adesc    Bthing 
1      John    Malcom   Bag
1      John    Malcom   Pet
2      Steve   Jobs     Ball
3      Mark    The Best null

This data will be shown through a boostrap-datatable, and my Controler would populate it as a plain json object.

How do you build the DAO/JavaBeans to solve it? I think the best option is creating an utility class which transform, the List objects in this plain json, which does not alter the basic structure of the model, but a partner has suggested other solution.