Spring: Data truncation: Data too long for column 'page_content' at row 1, why?

Question

Spring

I process a text file — "book". Each line of this file will later be a book page (BookPage).
What I do: I create a stream from the file and, filtering out empty lines, convert the stream into a List:

...
    stringList = fileLinesStream.filter(l -> !l.isEmpty()).collect(Collectors.toList());
...

Then I go over the elements of the list and on each repetition I create a new BookPage object, to the pageContent field of which I assign the contents of the List element:

for (int i = 0; i < stringList.size(); i++) {
    BookPage bookPage = new BookPage(book, stringList.get(i));
    bookPageService.CreatePage(bookPage); // в этом методе сервиса вызывается bookPageRepository.save(bookPage);
    }

The object is created, but at the next step ( bookPageService.CreatePage(bookPage)) Spring crashes with the error:
Data truncation: Data too long for column 'page_content' at row 1

There are only four lines in the test file, the longest of which is 430 characters.

book page

@Entity
@Table(name = "pages")
public class BookPage {
    @Id
    @GeneratedValue(strategy = GenerationType.IDENTITY)
    private long id;

    @ManyToOne(fetch = FetchType.EAGER)
    @JoinColumn(name = "book_id")
    private Book book;

    @Column(columnDefinition = "LONGBLOB")
    private String pageContent;

    public BookPage(Book book, String pageContent) {
        this.book = book;
        this.pageContent = pageContent;
    }

    public BookPage() {
    }
}

In the annotation to pageContent, I tried different columnDefinition values: both LONGBLOB and TEXT, but nothing changes.

What could be the reason? In data type? Any other restrictions?

Answer 1

It looks like the problem was that my changes in the code were not reflected in the database.
Everything was solved simply: I deleted the table, and the next time the application was launched, it was recreated.
Everything works with:

@Column(columnDefinition = "TEXT",
            name = "page_content")
    private String pageContent;