How to update a child entity in @OnetoMany relationship in Spring Data JPA

I have a parent class:

@Entity(name = "Master")
@Table(name = "master")
public class Master {

    @Id
    @GeneratedValue(strategy= GenerationType.IDENTITY)
    private Integer id;

    @Column(name = "name") 
    private String name;


    @OneToMany(mappedBy = "master", cascade = CascadeType.ALL, fetch = FetchType.Lazy)
    List<AdditionalAttribute> additionalAttributes = new ArrayList<>();


    public void addAttributes(AdditionalAttribute attribute) {
        additionalAttributes.add(attribute);
        attribute.setFindings(this);
    }

    public void removeAttributes(AdditionalAttribute attribute) {
        additionalAttributes.remove(attribute);
        attribute.setFindings(null);
    }
}

And the child class:

@Entity(name = "additional_attribute")
public class AdditionalAttribute {

    @Id
    @GeneratedValue(strategy = GenerationType.IDENTITY)
    private Long Id;

    private String attributeName;

    @Column(length = 255)
    private String attributeValue;

    @ManyToOne(fetch = FetchType.LAZY)
    @JoinColumn(name = "master_id")
    private Master master;

}

Now let's say I already have inserted data in both the tables like:

  Master
 ================
 id.      name
 1.       xyz

 AdditionalAttribute
======================================================
 id.     attributeName.   attributeValue.    master_id
 1         Acme               test               1
 2.        loreal             red                1

Now given the master_id, how do I update the attributeValue in the AdditionalAttribute table for that id??

What I have done is:

1. Get the list of additionalAttributes from the master entity (the one we got from session)

2. Iterate over the list and get each AdditionAttribute object.

3. Set the new value to the object.

Is it a good way of updating? Do we have any better approach?