解决nacos升级spring cloud 2020.0无法使用bootstrap.yml的问题

nacos升级spring cloud 2020.0无法使用bootstrap.yml

之前用spring cloud整合nacos，需要一个bootstrap.yml作为spring启动的初始化配置

bootstrap.yml内容大概如下：

spring:
  application:
    # 应用名称
    name: xxx
  profiles:
    active: dev
  cloud:
    nacos:
      config:
        file-extension: yml
        server-addr: localhost:8848
        username: nacos
        password: nacos

把spring cloud升级到2020.0.x以后，nacos就读不到bootstrap.yml了

spring官方其实在change note中说明了，在新版中将spring.cloud.bootstrap.enabled默认设置为false不启用：

https://github.com/spring-cloud/spring-cloud-release/wiki/Spring-Cloud-2020.0-Release-Notes#breaking-changes

源码部分如下：

/*
 * Copyright 2013-2020 the original author or authors.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      https://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package org.springframework.cloud.util;
import org.springframework.core.env.Environment;
import org.springframework.util.ClassUtils;
public abstract class PropertyUtils {

 /**
  * Property name for checking if bootstrap is enabled.
  */
 public static final String BOOTSTRAP_ENABLED_PROPERTY = "spring.cloud.bootstrap.enabled";

 /**
  * Property name for spring boot legacy processing.
  */
 public static final String USE_LEGACY_PROCESSING_PROPERTY = "spring.config.use-legacy-processing";

 /**
  * Property name for bootstrap marker class name.
  */
 public static final String MARKER_CLASS = "org.springframework.cloud.bootstrap.marker.Marker";

 /**
  * Boolean if bootstrap marker class exists.
  */
 public static final boolean MARKER_CLASS_EXISTS = ClassUtils.isPresent(MARKER_CLASS, null);

 private PropertyUtils() {
  throw new UnsupportedOperationException("unable to instatiate utils class");
 }

 /**
  * 判断是否启用bootstrap.yml的时候默认设置成了false
  */
 public static boolean bootstrapEnabled(Environment environment) {
  return environment.getProperty(BOOTSTRAP_ENABLED_PROPERTY, Boolean.class, false) || MARKER_CLASS_EXISTS;
 }

 public static boolean useLegacyProcessing(Environment environment) {
  return environment.getProperty(USE_LEGACY_PROCESSING_PROPERTY, Boolean.class, false);
 }
}

解决方案是在vm启动参数中增加-Dspring.cloud.bootstrap.enabled=true，或者增加spring-cloud-starter-bootstrap依赖，至于spring cloud alibaba nacos后续是否能支持application.yml，目前alibaba官方还没有回复

nacos避坑指南！nacos 配置中心无法加载bootstrap.yml/properties配置文件

在使用nacos时引入以下两个依赖：

<!--服务注册/发现-->
<dependency>
    <groupId>com.alibaba.cloud</groupId>
    <artifactId>spring-cloud-starter-alibaba-nacos-discovery</artifactId>
</dependency>

<!--配置中心来做配置管理-->
<dependency>
    <groupId>com.alibaba.cloud</groupId>
    <artifactId>spring-cloud-starter-alibaba-nacos-config</artifactId>
</dependency>

错误异常信息：

com.alibaba.nacos.api.exception.NacosException: java.lang.reflect.InvocationTargetException

......

Caused by: java.lang.reflect.InvocationTargetException: null
at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method) ~[na:1.8.0_211]
at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:62) ~[na:1.8.0_211]
at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45) ~[na:1.8.0_211]
at java.lang.reflect.Constructor.newInstance(Constructor.java:423) ~[na:1.8.0_211]
at com.alibaba.nacos.api.config.ConfigFactory.createConfigService(ConfigFactory.java:42) ~[nacos-api-1.1.1.jar:na]
... 34 common frames omitted
Caused by: com.alibaba.nacos.api.exception.NacosException: endpoint is blank

解决方案：加入以下依赖即可

<!-- 若bootstrap配置不生效，加入以下依赖 -->
<dependency>
     <groupId>org.springframework.cloud</groupId>
     <artifactId>spring-cloud-starter-bootstrap</artifactId>
     <version>3.0.1</version>
</dependency>

配置文件：

在启动服务后的第一条日志信息：

上面的 【conpon-service.properties】添加到nacos中

补充一下：nacos配置修改后，项目中要动态实时更新，项目中需要动态配置，在congtroller中加入一个注解

@RefreshScope // 动态刷新nacos配置

即可。

以上为个人经验，希望能给大家一个参考，也希望大家多多支持我们。