@Entity
@Table(name = "allegato")
public class Allegato extends org.jfxtras.lang.XObject implements java.io.Serializable{
    @Id
    @GeneratedValue(strategy=GenerationType.IDENTITY)
    @Column(name = "ID_ALLEGATO")
    private long idAllegato;
    @Column(name = "ID_DIAGNOSI")
    private long idDiagnosi;
    @Column(name="BLOB", length=Integer.MAX_VALUE - 1)
    @Basic(fetch=FetchType.LAZY)
    private Blob blob;

   
    public long getIdAllegato() {
        return idAllegato;
    }

    public void setIdAllegato(long idAllegato) {
        this.idAllegato = idAllegato;
    }


    public long getIdDiagnosi() {
        return idDiagnosi;
    }

    public void setIdDiagnosi(long idDiagnosi) {
        this.idDiagnosi = idDiagnosi;
    }

   
    public Blob getBlob() {
        return blob;
    }

    public void setBlob(Blob blob) {
        this.blob = blob;
    }}

File source = new File(allegati[j]);
byte[] bFile = new byte[(int) source.length()];
                try {
                   
                    FileInputStream fileInputStream = new FileInputStream(source.getAbsolutePath());
                    //convert file into array of bytes
                    fileInputStream.read(bFile);
                    Blob cBlob = Hibernate.createBlob(fileInputStream, (int) source.length());
                     cAllegato.setBlob(cBlob);
                     fileInputStream.close();

GRAVE: A truncation error was encountered trying to shrink BLOB '(Binary data value not displayed)' to length 255.
Exception occurred during event dispatching:
ortholab2.dao.DataAccessLayerException: org.hibernate.exception.DataException: could not insert: [ortholab2.entity.Allegato]