HibernateSystemException: Found shared references to a collection:

今天在寫項目的時候爆了這個錯誤

rpd] 2019-07-13 16:08:31 ERROR GlobalExceptionHandler: Found shared references to a collection: com.rpdgd.freemarket.business.ship.domain.FreeMarketShipPlan.shipWeighDetail; nested exception is org.hibernate.HibernateException: Found shared references to a collection: com.rpdgd.freemarket.business.ship.domain.FreeMarketShipPlan.shipWeighDetail
org.springframework.orm.hibernate3.HibernateSystemException: Found shared references to a collection: com.rpdgd.freemarket.business.ship.domain.FreeMarketShipPlan.shipWeighDetail; nested exception is org.hibernate.HibernateException: Found shared references to a collection: com.rpdgd.freemarket.business.ship.domain.FreeMarketShipPlan.shipWeighDetail
	at org.springframework.orm.hibernate3.SessionFactoryUtils.convertHibernateAccessException(SessionFactoryUtils.java:690)
	at org.springframework.orm.jpa.vendor.HibernateJpaDialect.translateExceptionIfPossible(HibernateJpaDialect.java:103)
	at org.springframework.dao.support.DataAccessUtils.translateIfNecessary(DataAccessUtils.java:213)
	at org.springframework.orm.jpa.JpaAccessor.translateIfNecessary(JpaAccessor.java:155)
	at org.springframework.orm.jpa.JpaTemplate.execute(JpaTemplate.java:192)
	at org.springframework.orm.jpa.JpaTemplate.execute(JpaTemplate.java:150)
	at com.gwqm.base.basedao.GenericEntityDao.query(GenericEntityDao.java:87)
	at com.gwqm.base.basedao.GenericDAO.query(GenericDAO.java:92)
	at com.gwqm.base.service.impl.BaseServiceImpl.query(BaseServiceImpl.java:131)
	at com.rpdgd.freemarket.business.order.service.impl.FreeMarketOrderItemServiceImpl.getBySrcOrderItemId(FreeMarketOrderItemServiceImpl.java:84)
	at com.rpdgd.freemarket.business.order.service.impl.FreeMarketOrderItemServiceImpl$$FastClassBySpringCGLIB$$3317ce71.invoke(<generated>)

 

炸一看，莫名其妙，  經過上網查了一下 。說是 不能引用同一個對象。

看了一下這個 https://blog.csdn.net/yucharlie/article/details/75646053

開始我還覺得 是  由於我  兩個 entity 關聯了 同一個對象的問題。

因而 接着看  其餘的https://blog.csdn.net/Yoga0301/article/details/80468149

說是 BeanUtil.copyPropertis 的用法問題

查了一下 出錯代碼的位置

FreeMarketShipPlan srcPlan = new FreeMarketShipPlan();
				com.rongpd.util.BeanUtils.copyProperties(plan_db, srcPlan);

 

而後 這個對象 裏面 ：

/**
	 * 關聯磅重明細
	 */
	@OneToMany(mappedBy = "shipPlan", fetch = FetchType.LAZY)
	@Where(clause="disabled='"+DISABLE_NORMAL+"'")
	private List<FreeMarketShipWeighDetail> shipWeighDetail;

	public List<FreeMarketShipWeighDetail> getShipWeighDetail() {
		return shipWeighDetail;
	}

 

因此將這個集合 給 複製 copy 給了新的對象。 不能共享同一個集合， 這麼回事

解決辦法，若是新對象不須要這個 關聯 集合， 那麼設置爲空便可

srcPlan.setShipWeighDetail(null);

就沒有問題了。 不然就 新建一個 集合，  將 被複制的對象的集合數據 內容 給 新的集合，

新集合再  放入 新的對象裏面便可