1、

问题：
2021-01-06 15:43:41.663 ERROR 10184 --- [io-13000-exec-2] c.y.a.c.v1.retcode.RetControlller        : 修改失败：[could not execute statement; SQL [n/a]; constraint [UNIQUE_RETCODECONVERT]; nested exception is org.hibernate.exception.ConstraintViolationException: could not execute statement]

原因：

约束冲突异常

2、

问题：
2021-01-06 19:17:22.971 ERROR 8712 --- [io-13000-exec-2] c.y.w.c.GlobalControllerExceptionHandler : Exception: Type definition error: [simple type, class org.hibernate.proxy.pojo.bytebuddy.ByteBuddyInterceptor]; nested exception is com.fasterxml.jackson.databind.exc.InvalidDefinitionException: No serializer found for class org.hibernate.proxy.pojo.bytebuddy.ByteBuddyInterceptor and no properties discovered to create BeanSerializer (to avoid exception, disable SerializationFeature.FAIL_ON_EMPTY_BEANS) (through reference chain: org.springframework.ui.ModelMap["data"]->cn.yihuazt.atmp.entity.areacode.AreaCode$HibernateProxy$7WugFhzV["hibernateLazyInitializer"])
原因：
 /**
     * 修改地区码
     *
     * @param areaCodeForm
     * @return
     */
    @ApiPermission
    @PutMapping("/update")
    public ModelMap updateAreaCode(@RequestBody AreaCodeForm areaCodeForm) {
        ModelMap modelMap = new ModelMap();
        try {
            AreaCode areaCode1 = areaCodeService.getById(areaCodeForm.getId());
            if (areaCode1 != null) {
                AreaCode areaCode = areaCodeService.save(toEntity(areaCodeForm));
                modelMap.put(FishConstant.SUCCESS, true);
                modelMap.put(FishConstant.DATA, areaCode);
            } else {
                modelMap.put(FishConstant.SUCCESS, false);
                modelMap.put(FishConstant.ERROR_MSG, "修改失败，地区码不存在");
                return modelMap;
            }
        } catch (JpaObjectRetrievalFailureException e) {
            logger.error("修改失败：[" + e.getMessage() + "]");
            modelMap.put(FishConstant.SUCCESS, false);
            modelMap.put(FishConstant.ERROR_MSG, "修改失败，地区码不存在，请刷新页面");
            return modelMap;
        } catch (Exception e) {
            logger.error("修改失败：[" + e.getMessage() + "]");
            modelMap.put(FishConstant.SUCCESS, false);
            modelMap.put(FishConstant.ERROR_MSG, "修改失败");
            return modelMap;
        }
        return modelMap;
    }
}

解决：
 /**
     * 修改地区码
     *
     * @param areaCodeForm
     * @return
     */
    @ApiPermission
    @PutMapping("/update")
    public ModelMap updateAreaCode(@RequestBody AreaCodeForm areaCodeForm) {
        ModelMap modelMap = new ModelMap();
        try {
            AreaCode areaCode1 = areaCodeService.getById(areaCodeForm.getId());
            if (areaCode1 != null) {
                AreaCode areaCode = areaCodeService.update(toEntity(areaCodeForm));
                modelMap.put(FishConstant.SUCCESS, true);
                modelMap.put(FishConstant.DATA, areaCode);
            } else {
                modelMap.put(FishConstant.SUCCESS, false);
                modelMap.put(FishConstant.ERROR_MSG, "修改失败，地区码不存在");
                return modelMap;
            }
        } catch (JpaObjectRetrievalFailureException e) {
            logger.error("修改失败：[" + e.getMessage() + "]");
            modelMap.put(FishConstant.SUCCESS, false);
            modelMap.put(FishConstant.ERROR_MSG, "修改失败，地区码不存在，请刷新页面");
            return modelMap;
        } catch (Exception e) {
            logger.error("修改失败：[" + e.getMessage() + "]");
            modelMap.put(FishConstant.SUCCESS, false);
            modelMap.put(FishConstant.ERROR_MSG, "修改失败");
            return modelMap;
        }
        return modelMap;
    }
}

3、

问题：
2021-01-06 19:25:27.434 ERROR 6368 --- [io-13000-exec-4] c.y.w.c.GlobalControllerExceptionHandler : Exception: Type definition error: [simple type, class org.hibernate.proxy.pojo.bytebuddy.ByteBuddyInterceptor]; nested exception is com.fasterxml.jackson.databind.exc.InvalidDefinitionException: No serializer found for class org.hibernate.proxy.pojo.bytebuddy.ByteBuddyInterceptor and no properties discovered to create BeanSerializer (to avoid exception, disable SerializationFeature.FAIL_ON_EMPTY_BEANS) (through reference chain: org.springframework.ui.ModelMap["data"]->cn.yihuazt.atmp.entity.areacode.AreaCode$HibernateProxy$pnyIGUVh["hibernateLazyInitializer"])

解决：

实体类上添加
@JsonIgnoreProperties({"hibernateLazyInitializer","handler"})