com.fasterxml.jackson.databind.JsonMappingException: No serializer found for class org.hibernate.proxy.pojo.javassist.JavassistLazyInitializer and no properties discovered to create BeanSerializer

解决方式：

1.可以将报错位置的

    @ManyToOne(fetch = FetchType.LAZY)
    @JoinColumn(name = "TypeId")
    public CouponType getType() {
        return type;
    }

修改为

    @ManyToOne(fetch = FetchType.EAGER)
    @JoinColumn(name = "TypeId")
    public CouponType getType() {
        return type;
    }