我已经成功用hibernate写了我的第一个主要的孩子例子。几天后,我再次使用它并升级了一些库。不知道我做了什么,但是我再也无法使它运行了。有人可以帮助我找出返回以下错误消息的代码中的错误吗:
org.hibernate.PersistentObjectException: detached entity passed to persist: example.forms.InvoiceItem at org.hibernate.event.def.DefaultPersistEventListener.onPersist(DefaultPersistEventListener.java:127) at org.hibernate.impl.SessionImpl.firePersist(SessionImpl.java:799) at org.hibernate.impl.SessionImpl.persist(SessionImpl.java:791) .... (truncated)
hibernate映射:
<hibernate-mapping package="example.forms"> <class name="Invoice" table="Invoices"> <id name="id" type="long"> <generator class="native" /> </id> <property name="invDate" type="timestamp" /> <property name="customerId" type="int" /> <set cascade="all" inverse="true" lazy="true" name="items" order-by="id"> <key column="invoiceId" /> <one-to-many class="InvoiceItem" /> </set> </class> <class name="InvoiceItem" table="InvoiceItems"> <id column="id" name="itemId" type="long"> <generator class="native" /> </id> <property name="productId" type="long" /> <property name="packname" type="string" /> <property name="quantity" type="int" /> <property name="price" type="double" /> <many-to-one class="example.forms.Invoice" column="invoiceId" name="invoice" not-null="true" /> </class> </hibernate-mapping>
编辑: InvoiceManager.java
class InvoiceManager { public Long save(Invoice theInvoice) throws RemoteException { Session session = HbmUtils.getSessionFactory().getCurrentSession(); Transaction tx = null; Long id = null; try { tx = session.beginTransaction(); session.persist(theInvoice); tx.commit(); id = theInvoice.getId(); } catch (RuntimeException e) { if (tx != null) tx.rollback(); e.printStackTrace(); throw new RemoteException("Invoice could not be saved"); } finally { if (session.isOpen()) session.close(); } return id; } public Invoice getInvoice(Long cid) throws RemoteException { Session session = HbmUtils.getSessionFactory().getCurrentSession(); Transaction tx = null; Invoice theInvoice = null; try { tx = session.beginTransaction(); Query q = session .createQuery( "from Invoice as invoice " + "left join fetch invoice.items as invoiceItems " + "where invoice.id = :id ") .setReadOnly(true); q.setParameter("id", cid); theInvoice = (Invoice) q.uniqueResult(); tx.commit(); } catch (RuntimeException e) { tx.rollback(); } finally { if (session.isOpen()) session.close(); } return theInvoice; } }
发票.java
public class Invoice implements java.io.Serializable { private Long id; private Date invDate; private int customerId; private Set<InvoiceItem> items; public Long getId() { return id; } public Date getInvDate() { return invDate; } public int getCustomerId() { return customerId; } public Set<InvoiceItem> getItems() { return items; } void setId(Long id) { this.id = id; } void setInvDate(Date invDate) { this.invDate = invDate; } void setCustomerId(int customerId) { this.customerId = customerId; } void setItems(Set<InvoiceItem> items) { this.items = items; } }
InvoiceItem.java
public class InvoiceItem implements java.io.Serializable { private Long itemId; private long productId; private String packname; private int quantity; private double price; private Invoice invoice; public Long getItemId() { return itemId; } public long getProductId() { return productId; } public String getPackname() { return packname; } public int getQuantity() { return quantity; } public double getPrice() { return price; } public Invoice getInvoice() { return invoice; } void setItemId(Long itemId) { this.itemId = itemId; } void setProductId(long productId) { this.productId = productId; } void setPackname(String packname) { this.packname = packname; } void setQuantity(int quantity) { this.quantity = quantity; } void setPrice(double price) { this.price = price; } void setInvoice(Invoice invoice) { this.invoice = invoice; } }
编辑: 从客户端发送的JSON对象:
{"id":null,"customerId":3,"invDate":"2005-06-07T04:00:00.000Z","items":[ {"itemId":1,"productId":1,"quantity":10,"price":100}, {"itemId":2,"productId":2,"quantity":20,"price":200}, {"itemId":3,"productId":3,"quantity":30,"price":300}]}
编辑: 一些详细信息: 我试图通过以下两种方法来保存发票:
手动制作上述json对象,并将其传递给服务器的新会话。在这种情况下,在调用save方法之前绝对没有进行任何活动,因此除了在save方法中打开的会话外,不应有任何打开的会话。
使用getInvoice方法加载现有数据,并且在删除键值后它们传递了相同的数据。我也认为这应该在保存之前关闭会话,因为在getInvoice方法中提交了事务。
在这两种情况下,我都会收到相同的错误消息,迫使我相信hibernate配置文件或实体类或保存方法出了问题。
请让我知道是否需要提供更多详细信息
您没有提供许多相关的详细信息,所以我猜您调用了它getInvoice,然后您使用了result对象来设置一些值,save并假设您的对象更改将被保存进行调用。
getInvoice
save
但是,该persist操作适用于全新的临时对象,如果已经分配了ID,则它将失败。在您的情况下,您可能想致电saveOrUpdate而不是persist。
persist
saveOrUpdate
您可以在此处找到有关JPA / EJB代码的一些讨论和参考资料“传递给持久错误的分离实体”