How to get the value of the lazy Hibernate field through reflection

I found similar questions, but they did not answer my question.

I have two entities with a many-to-one relationship - unidirectional. But most importantly, the relationship is lazy. Because it is correct to use a lazy connection, everyone knows it.

Code:

@Entity
public class User implements BaseEntity {

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

    @Column
    private String name;

    @ManyToOne(fetch = FetchType.LAZY)
    private City city;

}

@Entity
public class City implements BaseEntity {

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

    @Column
    private String name;
}

interface BaseEntity {
    void setId(Long id);
    Long getId();
}

I wrote a method that allows you to search by the transferred fields of the entity. An example of how this works:

public class Search<T extends BaseEntity> {

    public List<T> getByFields(T entity, List<String> fieldNames) {
        // create criteria with passed field name by reflection
    } 
}

The problem is that problems start when you need to search and related objects - by creating related queries.

The following entry is used to send the associated field: "city.id" and the problem is that when I transfer the essence of the related object (City) it is in a proxy and I cannot get id by reflection from City.

My function works perfectly if you specify:

@ManyToOne(fetch = FetchType.EAGER)
private City city;

But it will greatly affect performance, since I have a lot of related objects. Therefore, I want to solve this problem for a lazy load.

I know that this is not an easy task. But perhaps there is some opportunity to somehow get around this problem.