Main.java

    @JsonIdentityInfo(generator = ObjectIdGenerators.PropertyGenerator.class, property = "id", scope = Parent.class)
    public static class Parent {
        private long id;
        private String name;
        @OneToMany
        private List<Child> children = new ArrayList<>();

        public long getId() {
            return id;
        }

        public void setId(long id) {
            this.id = id;
        }

        public String getName() {
            return name;
        }

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

        public List<Child> getChildren() {
            return children;
        }

        public Parent addChild(Child child) {
            this.children.add(child);
            return this;
        }

        public void setChildren(List<Child> children) {
            this.children = children;
        }
    }

    @JsonIdentityInfo(generator = ObjectIdGenerators.PropertyGenerator.class, property = "id", scope = Child.class)
    public static class Child {
        private long id;
        private String name;
        @ManyToOne
        private Parent parent;

        public long getId() {
            return id;
        }

        public void setId(long id) {
            this.id = id;
        }

        public String getName() {
            return name;
        }

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

        public Parent getParent() {
            return parent;
        }

        public void setParent(Parent parent) {
            this.parent = parent;
        }
    }