#2143 new
greenLED

Hibernate delete silently failing

Reported by greenLED | January 15th, 2018 @ 07:35 PM

I have a web application with three models: Classroom, Student and Group (see details). Each model has exactly one instance in database, and those instances are related to each other. Ideally, deleting a classroom should also delete it's groups, and dissociate it's students, deleting a student should dissociate it's classrooms and groups, and deleting a group should dissociate it's students, but it is not working.

When I try to delete a classroom, a student or a group they are simply not deleted. No runtime exception, no SQL error, no nothing. It just fails silently. I set jpa.debugSQL=true and don't see any delete statement issued, just selects.

Somehow, courses with groups not related to students are deleted correctly.

Framework version: 1.5.0
Platform you're using: Linux (Ubuntu 16.04, openjdk-8)

Reproduction steps:

  1. Try to .delete() a Classroom, Group or Student object
  2. Should delete object and cascade deletion to children objects, but does not delete anything

Details:

Source code with unit test cases is available on GitHub

|Classroom|[Many]-------[Many]|Student|
   [One]                        [Many]
     |                           /
     |                          /
   [Many]                      /
   |Group|[Many]--------------´
@Entity(name = "r_classroom")
public class Classroom extends Model {
    @OneToMany(mappedBy = "classroom", cascade = CascadeType.ALL, orphanRemoval = true)
    public List<Group> groups = new ArrayList<>();

    @ManyToMany(mappedBy = "classrooms", cascade = {CascadeType.PERSIST, CascadeType.MERGE})
    public List<Student> students = new ArrayList<>();

    public String name;
}

@Entity(name = "r_student")
public class Student extends Model {
    @ManyToMany(cascade = {CascadeType.PERSIST, CascadeType.MERGE})
    public List<Classroom> classrooms = new ArrayList<>();

    @ManyToMany(cascade = {CascadeType.MERGE, CascadeType.PERSIST})
    public List<Group> groups = new ArrayList<>();

    public String name;
}

@Entity(name = "r_group")
public class Group extends Model {
    @ManyToOne
    public Classroom classroom;

    @ManyToMany(mappedBy = "groups", cascade = {CascadeType.PERSIST, CascadeType.MERGE})
    public List<Student> students = new ArrayList<>();

    public String name;
}

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