HibernateProxy.toString lazy initializacion exception

I'm getting a weird error while I'm debugging my POC.
I have 2 entities:

@Getter
@Setter
@Entity
@Table(name = "APPLICANT")
public class Applicant implements Serializable {


    private static final long serialVersionUID = 6060170457948717553L;

    @Id
    @Column(name = "applicant_id", insertable = false, nullable = false)
    private Long applicantId;

    @Column(name = "application_id", unique = true)
    private String applicationId;

    @OneToOne(fetch = FetchType.LAZY, optional = false)
    @JoinColumn(name = "application_id", referencedColumnName = "application_id", insertable = 
    false, updatable = false)
    private ApplicationEntity applicationEntity;

@Getter
@Setter
@Entity
@Table(name = "APPLICATION")
public class ApplicationEntity implements Serializable{

    private static final long serialVersionUID = 7300036359295729197L;

    @Id
    @Column(name = "APPLICATION_ID")
    private String id;

    @OneToOne(mappedBy = "applicationEntity", fetch = FetchType.LAZY)
    private Applicant applicant;

These classes has the repositories interfaces extending from CrudRepository, and in the Applicant repository I have a custom method to get the entity with the applicationId:
Applicant findByApplicationId(String applicationId);
But, when I'm debugging, I see the following message in the intellij debuguer on the applicationEntity attribute:

Method threw 'org.hibernate.LazyInitializationException' exception. Cannot evaluate
org.example.postgres.jpa.model.ApplicationEntity$HibernateProxy$qa4PKx8V.toString()

The value qa4PKx8V changes every time that I perform a new test.

I tried a lot of combinations in the @Join annotation, I've deleted the lombook annotations, I've used the @Transactional annotation either, but is always the same error.

A key point to note, is that I can get the data from the table with any error, I just see this message in the debugger, so my question is, this is a thing of intellij or something like that? Or I need to fix this with configuration or changing something in my code?

Thanks.

I am assuming you have an autogenerated toString() implementation?

In general, you should avoid referencing lazily-loaded properties in toString(), equals(), hashCode() etc. Failing to do so will result in LazyInitializationException surprises like the one you're facing, triggered by the aforementioned methods whenever they try to access lazy properties outside of an active transaction context.

(This is indeed 'a thing of intellij', in the sense that although the debugged code is probably surrounded by a transaction, the Intellij inspector evaluates the expression on a separate thread where no transaction is active = no persistence context is open. Also, it will only happen with @XxxToOne(optional = false) properties)