jpa cannot simultaneously fetch multiple bags OneToMany

    @OneToMany(targetEntity = PacketPrize.class, fetch = FetchType.EAGER)
    @JoinColumn(name = "packetId", referencedColumnName = "id",
            insertable = false, updatable = false,
            foreignKey = @ForeignKey(value = ConstraintMode.NO_CONSTRAINT))
    private List<PacketPrize> packetPrizes;


    @OneToMany(targetEntity = NewUserPacketDetail.class, fetch = FetchType.LAZY)
    @JoinColumn(name = "packetId", referencedColumnName = "id",
            insertable = false, updatable = false,
            foreignKey = @ForeignKey(value = ConstraintMode.NO_CONSTRAINT))
    private List<NewUserPacketDetail> packetDetails;

在用JPA进行注释时，如果一个实体里要映射多个集合实体时，我们不能把两个集合的的FetchType设置为EAGER,此时只能设置为LAZY,否则会报：cannot simultaneously fetch multiple bags。

但是有个问题，查询可能会报错：

Method threw 'org.hibernate.LazyInitializationException' exception. Cannot evaluate com.**.activitys.model.***.toString()

service层加 @Transactional 可以查出来。但是controller还报错

、、还没解决

又出现一个问题，这样controller没问题，但是页面加载还是会报错

could not initialize proxy - no Session

这个时候添加配置：

spring.jpa.open-in-view=true

参考：https://blog.youkuaiyun.com/johnf_nash/article/details/80658626