The entity class associated to task table should look as follows:

@Entity
@Table(name="task",catalog="task_mgmt_system")
class Task {
   @Id
   @GeneratedValue(strategy=GenerationType.IDENTITY)
   @Column(name = "id")
   private var id :Int?=null

   @Column(name="title")
   private var title : String? = null
   
   @Column(name="detail")
   private var detail : String? = null

   @Column(name="assigned_to")
   private var assignedTo : Int? = null

   @Column(name="status")
   private var status : String? = null

   @OneToMany
   @JoinColumn(name ="task_id")
   private var comments : MutableSet<Comments>? = null

  // .. Getters and Setters
}

The @OneToMany annotation is used to declare a one-to-many relationship with the comments table. The @JoinColumn annotation is used to declare the column reference in the comments table.