Removing a cascade from a connection table using the @ManyToMany annotation

Question

Hi, I am having a problem displaying my objects. I am using the implementation of JPA2 and Hibernate. I got tables with @ManyToMany annotation

http://img204.imageshack.us/img204/7558/przykladd.png

I displayed it with:

@Entity
@Table("employee")
class Employee {
      @Id
      @GeneratedValue(strategy = GenerationType.IDENTITY)
      private Integer id;

  @Column
  private String name; 

  @ManyToMany
  @JoinTable(name = "proj_emp",
             joinColumns = @JoinColumn(name = "employee_id", referencedColumnName = "id"),
             inverseJoinColumns = @JoinColumn(name = "project_id", referencedColumnName = "id"), 
             uniqueConstraints = @UniqueConstraint(columnNames = {"employee_id", "project_id"})) 
  private List<Project> projects;                ...}


@Entity
@Table("project")
class Project {
   @Id
   @GeneratedValue(strategy = GenerationType.IDENTITY)
   private Integer id; 

   @Column  
   private String name;    
      
   @Column    
   private Integer budget;        

   @ManyToMany(mappedBy = "projects")     
   private List<Employee> employees;                ...}

Now I would like to remove the cascade from the proj_emp table when I delete records from Employee, but nothing from the Project table can be deleted.

What is the best way to get this?

Thanks Dawid

Answer 1

@ManyToMany @OneToMany-ManyToOne , Hibernate, JPA EntityManager, JPA @ElementCollection ( JPA 2) . . . Hibernate @CollectionOfElements @ElementCollection