坚持一个会话导致分离的实体传递到坚持错误

我有以下公布的两个hibernate类，我试图插入记录到TestAuthor表中使用populateAuthorTable方法中提到的代码，这是在下面发布以及。当我运行的代码我收到坚持一个会话导致分离的实体传递到坚持错误

detached entity passed to persist: msc.hibernate.persistence.TestAuthor

请让我知道如何解决这个错误

populateAuthorTable：

private void populateAuthorTable() { 
    // TODO Auto-generated method stub 
    Session session = HibernateUtil.getCurrentSession(); 
    Transaction transaction = session.beginTransaction(); 
    ArrayList<TestAuthor> authorsList = new ArrayList<>(); 

    for (Long i = (long) 0; i < 30; i++) { 
     authorsList.add(new TestAuthor(i, "FName_" + i, "LName_" + i)); 
    } 

    int i = 0; 
    for (TestAuthor ta : authorsList) { 
     session.persist(ta); 
     i++; 
    } 
}

TestAuthor：

@Entity 
@Table(schema = "afk_owner", name = "testauthor") 
public class TestAuthor { 

@Id 
@Column(name = "authorid") 
@GeneratedValue(strategy = GenerationType.SEQUENCE, generator = "sequencegen") 
@SequenceGenerator(name = "sequencegen", sequenceName = "afk_owner.testauthor_seq", allocationSize = 1) 
private Long mAuthorID; 

@Column(name = "FNAME") 
private String mFName; 

@Column(name = "LNAME") 
private String mLName; 

@OneToMany(mappedBy = "author", cascade = CascadeType.ALL) 
private List<TestBook> booksList; 

public Long getmAuthorID() { 
    return mAuthorID; 
} 

public List<TestBook> getBooksList() { 
    return booksList; 
} 

public void setBooksList(List<TestBook> booksList) { 
    this.booksList = booksList; 
} 

public void setmAuthorID(Long mAuthorID) { 
    this.mAuthorID = mAuthorID; 
} 

public String getmFName() { 
    return mFName; 
} 

public void setmFName(String mFName) { 
    this.mFName = mFName; 
} 

public String getmLName() { 
    return mLName; 
} 

public void setmLName(String mLName) { 
    this.mLName = mLName; 
} 

public TestAuthor() { 
} 

public TestAuthor(Long id, String fName, String lName) { 
    this.mAuthorID = id; 
    this.mFName = fName; 
    this.mLName = lName; 
    this.booksList = new ArrayList<>(); 
}

}

来源

2016-09-28 user2121

当你设置一个新对象的@Id字段时，hibernate会认为它是一个分离的实体。您创建的序列生成器的要点是为新实体生成Ids。只是不要设置ID，它应该工作。非常粗略的解决方案：

public TestAuthor(Long id, String fName, String lName) { 
    //this.mAuthorID = id; 
    this.mFName = fName; 
    this.mLName = lName; 
    this.booksList = new ArrayList<>(); 
}

通常，当你的对象是真正的超脱，你会得到这个错误，而不是错误地发起新鲜的。

来源

2016-09-28 18:42:38 SergeiBednar

坚持一个会话导致分离的实体传递到坚持错误

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