Error común HIBERNATRE/JPA

[ajcremon]

Hola:

He estado buscando una solución por Internet pero sólo las he encontrado en inglés y me ha costado entenderlas. Tengo cuatro clases relacionadas tal que así:
- Clase Issue.java

Código:

Código Java:
@Entity
@Table(name = "table_issue")
public class Issue implements IIssue {
 
    @Id
    @GeneratedValue(strategy = GenerationType.AUTO)
    @Column(name = "issueNumber", unique = true)
    private int issueNumber;
 
    @Column(name = "name")
    private String name;
 
    @Column(name = "email", unique = true)
    private String email;
 
    @Column(name = "description")
    private String description;
 
    @ManyToOne(cascade = CascadeType.PERSIST, targetEntity = Product.class)
    @JoinColumn(name = "code_p")
    private IProduct product;
 
    @ManyToOne(cascade = CascadeType.PERSIST, targetEntity = MaintenanceProcedure.class)
    @JoinColumn(name = "code_mp")
    private IMaintenanceProcedure maintenanceProcedure;
 
    @ManyToOne(cascade = CascadeType.PERSIST, targetEntity = Technician.class)
    @JoinColumn(name = "technicianNumber")
    private ITechnician technician;
 
    @Column(name = "response")
    private String response;
 
    @Column(name = "punctuation")
    private int punctuation;
 
    @ManyToMany(cascade = CascadeType.PERSIST, targetEntity = Issue.class)
    @JoinColumn(name = "issueNumber")
    private Set<IIssue> recordList = new HashSet<IIssue>();
 
(...)

- Clase MaintenaceProcedure

Código:

Código Java:
@Entity
@Table(name = "table_maintenanceProcedure")
public class MaintenanceProcedure implements IMaintenanceProcedure {
 
    @Id
    @GeneratedValue(strategy = GenerationType.AUTO)
    @Column(name = "code_mp", unique = true)
    private int code_mp;
 
    @Column(name = "name", unique = true)
    private String name;
 
    @Column(name = "description")
    private String description;
 
    @ManyToMany(cascade = CascadeType.PERSIST, targetEntity = Product.class)
    @JoinColumn(name = "code_p")
    private Set<IProduct> productList = new HashSet<IProduct>();
 
    @ManyToMany(cascade = CascadeType.PERSIST, targetEntity = Technician.class)
    @JoinColumn(name = "technicianNumber")
    private Set<ITechnician> technicianList = new HashSet<ITechnician>();
 
    @OneToMany(mappedBy = "issueNumber", cascade = CascadeType.PERSIST, targetEntity = Issue.class)
    private Set<IIssue> issueList = new HashSet<IIssue>();
 
(...)

- Clase Technician

Código:

Código Java:
@Entity
@Table(name = "table_technician")
public class Technician implements ITechnician {
 
    @Id
    @GeneratedValue(strategy = GenerationType.AUTO)
    @Column(name = "technicianNumber", unique = true)
    private int technicianNumber;
 
    @Column(name = "email", unique = true)
    private String email;
 
    @Column(name = "password")
    private String password;
 
    @Column(name = "name")
    private String name;
 
    @Column(name = "lastname")
    private String lastname;
 
    @Column(name = "city")
    private String city;
 
    @Column(name = "country")
    private String country;
 
    @ManyToMany(cascade = CascadeType.PERSIST, targetEntity = MaintenanceProcedure.class)
    @JoinColumn(name = "code_mp")
    private Set<IMaintenanceProcedure> maintenanceProcedureList;
 
    @OneToMany(mappedBy = "issueNumber", cascade = CascadeType.PERSIST, targetEntity = Issue.class)
    private Set<IIssue> issueList;
 
(...)

- Clase Product

Código:

Código Java:
@Entity
@Table(name = "table_product")
public class Product implements IProduct {
 
    @Id
    @GeneratedValue(strategy = GenerationType.AUTO)
    @Column(name = "code_p", unique = true)
    private int code_p;
 
    @Column(name = "name", unique = true)
    private String name;
 
    @Column(name = "description")
    private String description;
 
    @ManyToMany(cascade = CascadeType.PERSIST, targetEntity = MaintenanceProcedure.class)
    @JoinColumn(name = "code_mp")
    private Set<IMaintenanceProcedure> maintenanceProcedureList;
 
    @OneToMany(mappedBy = "issueNumber", cascade = CascadeType.PERSIST, targetEntity = Issue.class)
    private Set<IIssue> issueList;
(...)
 

Estas clases se relacionan tal que así:

(todas bidireccionales)

Issue 0..* ----- 0..* Issue
Issue 0..* ----- 1 Product
Issue 0..* ----- 1 MaintenanceProcedure
Issue 0..* ----- 1 Technician
Product 1..* ----- 1..* MaintenanceProcedure
Technician 0..* ----- 1..10 MaintenanceProcedure

El problema es el siguiente. Al insertar un objeto de tipo Issue en la base de datos, me sale este error:
Caused by: com.mysql.jdbc.exceptions.jdbc4.MySQLIntegrityCons traintViolationException: Cannot add or update a child row: a foreign key constraint fails (`acmedb`.`table_issue`, CONSTRAINT `FK2395B528A0E34810` FOREIGN KEY (`issueNumber`) REFERENCES `table_technician` (`technicianNumber`))

¿Qué es lo que falla entre las relaciones? Muchas gracias y un saludo