javax.persistence.EntityNotFoundException: Unable to find <entity_type> with id <id_value> in Hibernate

Issue

• An ManyToOne association is defined

  @Entity
  public class Employee {
      @Id
      private String name;
      ...
      @OneToMany(mappedBy = "employee" ...)
      private List<Task> tasks;
  }
  
  @Entity
  public class Task {
      @Id
      private long id;
  
      private String name;
  
      @ManyToOne
      private Employee employee;
  }
  

• Referential integrity constraints were not created in the underlying database for the Task.employee_name column.
• A Task row references a non-existent row (with the name 'John Smith') in the Employee table.

• When loading the Task instance with the unresolvable Employee reference, an exception is raised:

  javax.persistence.EntityNotFoundException: Unable to find support.hibernate.entity.Employee with id John Smith