Hibernate中的错误或我对复合ID的误解？

Question

我不是JPA的大师，但这种行为对我来说很奇怪，请发表评论！

我试图保留嵌套对象： 每个员工都包含一组部门

如果部门@Id被声明为@Generated int，一切正常。但这很不方便，我尝试将@Id两个字段（员工ID +部门ID）声明为。但是我得到了

EJBTransactionRolledbackException: A different object with the same identifier value was already associated with the session

两者合并并保留。可以吗？

一些细节：

部门以这种方式宣布

@OneToMany(fetch = FetchType.LAZY, orphanRemoval = true, cascade = CascadeType.ALL)
@JoinColumn(name = "snils")
private Set<DepartmentRecord> departments = new HashSet<>();

该关系是单向的，而且未在Departments中声明人员

我用这种方式填充部门：

record.getDepartments().add(new DepartmentRecord(snils, department));

以这种方式创建人：

Person record = em.find(Person.class, snils);

if (record == null)
        record = new Person();

record.setSnils(snils);
record.setFullname(fullname);
record.resetLastActive();

在em.persist（记录）或em.merge（记录）上我得到一个例外。 包装它以尝试捕获阻止没有帮助

Transaction cannot proceed: STATUS_MARKED_ROLLBACK

我需要的 - 只是更新人员和部门。是否有可能没有样板代码（删除级联，执行单独的部门搜索等）

我的环境：CentOS7，java8，Wildfly 10.2

人员表是：

snils      | character varying(255) | not null
blocked    | integer                | not null
fullname   | character varying(255) | 
lastactive | date                   | 
    Indexes:
"hr_workers_pkey" PRIMARY KEY, btree (snils)
Referenced by:
    TABLE "hr_departments" CONSTRAINT "fk49rcpg7j54eq6fpf9x2nphnpu"     FOREIGN KEY (snils) REFERENCES hr_workers(snils)

部门表是：

snils      | character varying(255) | not null
department | character varying(255) | not null
lastactive | date                   | 
     Indexes:
"hr_departments_pkey" PRIMARY KEY, btree (snils, department)
     Foreign-key constraints:
"fk49rcpg7j54eq6fpf9x2nphnpu" FOREIGN KEY (snils) REFERENCES hr_workers(snils)

实体人（实际上是SNILSRecord）：

@Entity
@Table(name = "hr_workers")
public class SNILSRecord implements Serializable {

@Id
private String snils;
private String fullname;

@OneToMany(fetch = FetchType.LAZY, orphanRemoval = true, cascade = CascadeType.ALL)
@JoinColumn(name = "snils")
private Set<DepartmentRecord> departments = new HashSet<>();

@Temporal(TemporalType.DATE)
private Date lastActive;
private int blocked;

// getters and setters

}

实体部门：

@Entity
@Table(name = "hr_departments")
public class DepartmentRecord implements Serializable {

@Id
private String snils;
@Id
private String department;

@Temporal(TemporalType.DATE)
private Date lastActive;