Student.java

package com.databasePoject;

import org.dom4j.dtd.Decl;

import javax.persistence.*;
import java.util.ArrayList;
import java.util.List;

@Entity
@Table(name="student")
public class Student {

    @Id
    @GeneratedValue(strategy = GenerationType.IDENTITY)
    @Column(name = "id_student")
    private int idStudent;

    @Column(name = "name")
    private String name;

    @Column(name = "surname")
    private String surname;

    @OneToMany(mappedBy = "idStudent",
            cascade = {CascadeType.PERSIST, CascadeType.MERGE,
                       CascadeType.DETACH, CascadeType.REFRESH})
    private List<Declaration> declarationList;


    public Student(){

    }

    public Student(String name, String surname) {
        this.name = name;
        this.surname = surname;
    }

    public int getId() {
        return idStudent;
    }

    public void setId(int idStudent) {
        this.idStudent = idStudent;
    }

    public String getName() {
        return name;
    }

    public void setName(String name) {
        this.name = name;
    }

    public String getSurname() {
        return surname;
    }

    public void setSurname(String surname) {
        this.surname = surname;
    }

    public List<Declaration> getDeclarationList() {
        return declarationList;
    }

    public void setDeclarationList(List<Declaration> declarationList) {
        this.declarationList = declarationList;
    }

    @Override
    public String toString() {
        return "Student{" +
                "id=" + idStudent +
                ", name='" + name + '\'' +
                ", surname='" + surname + '\'' +
                '}';
    }

    public void add(Declaration declaration){

        if(declarationList == null){
            declarationList = new ArrayList<>();
        }

        declarationList.add(declaration);
        declaration.setIdStudent(this);
    }
}