model代码如下：
@OneToMany(fetch=FetchType.EAGER, cascade = CascadeType.ALL) @Where(clause="isValid=1 and orderType=1") @JoinColumn(name = "orderUUID", referencedColumnName = "JobShippingOrderUUID",insertable = false, updatable = false) public List<BoJobgoods> getBoJobgoodsList() { return boJobgoodsList; } @OneToMany(fetch=FetchType.EAGER, cascade = CascadeType.ALL) @Where(clause="isValid=1 and orderType=1") @JoinColumn(name = "orderUUID", referencedColumnName = "JobShippingOrderUUID",insertable = false, updatable = false) public List<BoJobcontainer> getBoJobcontainerList() { return boJobcontainerList; }
启动就报错 Unable to build Hibernate SessionFactory; nested exception is org.hibernate.loader.MultipleBagFetch。。。。。。。。。。
原因是同一个model里不能有二个 FetchType.EAGER
于是把另一个改成:FetchType.LAZY 再次启动成功
但是访问接口又报另一个错：
Could not write JSON: failed to lazily initialize a collection of role: com.kintech.model.domain.bo.BoJobshippingorder.boJobgoodsList, could not initialize proxy - no Session; nested exception is com.fasterxml.jackson.databind.JsonMappingException: failed to lazily initialize a collection of role:
于是再改把后码的list字段添加@Fetch(FetchMode.SUBSELECT)注解代码如下：
@OneToMany(fetch=FetchType.EAGER) @Where(clause="isValid=1 and orderType=1") @JoinColumn(name = "orderUUID", referencedColumnName = "JobShippingOrderUUID",insertable = false, updatable = false) public List<BoJobgoods> getBoJobgoodsList() { return boJobgoodsList; } public void setBoJobgoodsList(List<BoJobgoods> boJobgoodsList) { this.boJobgoodsList = boJobgoodsList; } @OneToMany(fetch=FetchType.EAGER) @Fetch(FetchMode.SUBSELECT) @Where(clause="isValid=1 and orderType=1") @JoinColumn(name = "orderUUID", referencedColumnName = "JobShippingOrderUUID",insertable = false, updatable = false) public List<BoJobcontainer> getBoJobcontainerList() { return boJobcontainerList; }
再运行，完全搞定
原文：https://www.cnblogs.com/q149072205/p/14819175.html