保存多个实体时，Spring JPA插入错误的列

Question

I have encountered an issue where I save a list of entities all at once, sometimes some rows have values being written to wrong columns.

Basically, I have a Movie entity, which extends Show (annotated with @MappedSuperclass ), which extends TraceableEntity that is also annotated with @MappedSuperclass as shown below:

@MappedSuperclass
@EntityListeners(TraceableEntity.TraceableEntityListener.class)
public abstract class TraceableEntity {
    @Column
    private Date createdOn;

    @Column
    private Date dateUpdated;

    public Date getCreatedOn() {
        return createdOn;
    }

    public void setCreatedOn(Date createdOn) {
        this.createdOn = createdOn;
    }

    public Date getDateUpdated() {
        return dateUpdated;
    }

    public void setDateUpdated(Date dateUpdated) {
        this.dateUpdated = dateUpdated;
    }

    public static class TraceableEntityListener {
        @PrePersist
        public void beforeInsert(TraceableEntity entity) {
            if (entity.getCreatedOn() == null) {
                entity.setCreatedOn(new Date());
            }
        }

        @PreUpdate
        public void beforeUpdate(TraceableEntity entity) {
            entity.setDateUpdated(new Date());
        }
    }
}

Now, on some occasions, the value of createdOn ends up in dateUpdated , as shown in this screenshot .

In a nutshell, my application is a scraper that retrieves data from an API. I'm using RestTemplate in CompletableFuture to download data concurrently, and then save everything in one go. The method in which .save(...) is invoked is annotated with @Transactional . When the size of the list is under approximately 1500 the saving is fine, it seems that things go wrong when the size exceeds 1500 for some reason. I'd really appreciate your time and help in this matter!

Answer 1

Does it always happen at the same place? Are you missing some rows for example? perhaps the text of some of the stuff you're scraping has special characters that were not escaped properly? You may want to turn on your logging to see exactly what is being sent to the server.

The reason that if you scrape just the "problematic" movies and it turns out fine is probably because the actual problem occurred before the movies in question.