No serializer found for class org.hibernate.proxy.pojo.javassist.JavassistLazyInitializer and no properties discovered to create
BeanSerializer (to avoid exception, disable SerializationFeature.FAIL_ON_EMPTY_BEANS) )
去掉FetchType.LAZY
@ManyToOne(fetch = FetchType.LAZY)
或
@JsonIgnoreProperties(value={"hibernateLazyInitializer","handler","fieldHandler"})