java - Java Hibernate JPA删除OneToMany关系和MapKeyJoinColumn关系对象

我想创建和删除ProductPrice之一，
更新工作正常，但其他人给出了例外

产品类别

public class Product extends GenericEntity {
    @OneToMany(fetch=FetchType.EAGER, mappedBy = "product", targetEntity = ProductPrice.class, cascade = {CascadeType.ALL}, orphanRemoval=true)
    @Fetch(FetchMode.SUBSELECT)
    @Cache(usage = CacheConcurrencyStrategy.READ_WRITE, region="ncStandardElements")
    private List<ProductPrice> productPrices = new ArrayList<ProductPrice>();

    @OneToMany(fetch=FetchType.EAGER, mappedBy = "product", targetEntity = ProductPrice.class)
    @Fetch(FetchMode.SUBSELECT)
    @MapKeyJoinColumn(name="CURRENCY_ID")
    @Cache(usage = CacheConcurrencyStrategy.NONSTRICT_READ_WRITE, region="ncStandardElements")
    private Map<Currency, ProductPrice> productPriceMap = new HashMap<Currency, ProductPrice>();
}

产品价格分类

public class ProductPrice extends GenericEntitySimple {

    @ManyToOne(targetEntity = Product.class, optional=false)
    @JoinColumn(name = "PRODUCT_ID", referencedColumnName = "ID")
    private Product product;
}




public void removeProductPrice(ProductPrice price){
    Product p = price.getProduct();
    //Map<Currency, ProductPrice> productPriceMap = p.getProductPriceMap();
    //productPriceMap.remove(price);

    List<ProductPrice> prices = p.getProductPrices();
    prices.remove(price);
    p.setProductPrices(prices);
    productDao.merge(p);
}

如果在同一会话上创建了价格，则删除操作成功，但是，如果在当前会话之前创建了价格，则会引发以下错误：

Jun 13, 2013 3:26:29 PM org.apache.catalina.core.StandardWrapperValve invoke
SEVERE: Servlet.service() for servlet appServlet threw exception
org.hibernate.ObjectNotFoundException: No row with the given identifier exists: [com.netasoft.commerce.framework.catalog.model.ProductPrice#220]
    at org.hibernate.impl.SessionFactoryImpl$2.handleEntityNotFound(SessionFactoryImpl.java:435)
    at org.hibernate.event.def.DefaultLoadEventListener.load(DefaultLoadEventListener.java:233)
    at org.hibernate.event.def.DefaultLoadEventListener.proxyOrLoad(DefaultLoadEventListener.java:285)
    at org.hibernate.event.def.DefaultLoadEventListener.onLoad(DefaultLoadEventListener.java:152)
    at org.hibernate.impl.SessionImpl.fireLoad(SessionImpl.java:1090)

我没有完全获得MapKeyJoinColumn，也找不到有关这种情况的文档。我认为地图列表缓存会导致此错误。任何准备充分的文档建议也将获得批准。

最佳答案

我假设在调用removeProductPrice()之前，您先打开一个会话并开始交易。

在removeProductPrice()方法中，通过执行get（）将productPrice对象加载到持久性上下文中。喜欢，

ProductPrice price = productPriceDao.get(price.getPriceId());

// Then your logic to delete.

我怀疑在会话的持久性上下文中不存在传递给ProductPrice方法的removeProductPrice()对象。

您能否发布完整的堆栈跟踪信息，以显示导致异常的确切行。