1.问题
由于之前写了这篇文章：
[](Dubbo重启服务提供者或先启动服务消费者后启动服务提供者，消费者有时候会出现找不到服务的问题及解决)
之前的版本如下：
JDK版本：1.8
springBoot的版本：2.3.12.RELEASE
spring-cloud.version版本：Hoxton.SR9
spring-cloud-alibaba.version版本：2.2.6.RELEASE
dubbo.version版本：2.2.6.RELEASE
上面这篇文章由于在本地没有啥问题，后面今天我把这个方式的代码提交到我们的测试环境上，不知道为啥
出现服务一直注册不上去，然后消费者调用不到服务提供者的服务，测试环境挂机一个下午了，然后各种修改验证上面那篇文章的方法，结果完全不得行，不管是修改源码，还是定时任务检测更新服务信息，两种方法都试过了，本地跑起来服务可以注册上去，但是在公司的测试环境上，由于服务是跑在docker容器上，就会报容器中的host的ip解析在服务注册的时候连接不上去，连接被拒绝的奇葩问题，所以，我们就想对项目进行升级，请看如下解决方法。
2.解决办法
官方版本升级指南
https://github.com/alibaba/spring-cloud-alibaba/wiki/%E7%89%88%E6%9C%AC%E8%AF%B4%E6%98%8E
升级遇到问题参考
https://blog.csdn.net/thc1987/article/details/123638810?spm=1001.2101.3001.6661.1&utm_medium=distribute.pc_relevant_t0.none-task-blog-2%7Edefault%7EBlogCommendFromBaidu%7ERate-1-123638810-blog-125333903.235%5Ev38%5Epc_relevant_sort_base3&depth_1-utm_source=distribute.pc_relevant_t0.none-task-blog-2%7Edefault%7EBlogCommendFromBaidu%7ERate-1-123638810-blog-125333903.235%5Ev38%5Epc_relevant_sort_base3&utm_relevant_index=1
官方issue
https://github.com/alibaba/spring-cloud-alibaba/issues/2310
pom依赖如下：
父工程pom
<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
<modelVersion>4.0.0</modelVersion>
<!--<parent>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-parent</artifactId>
<version>2.3.12.RELEASE</version>
<relativePath/>
</parent>-->
<groupId>com.xxx</groupId>
<artifactId>xx-xx</artifactId>
<packaging>pom</packaging>
<version>1.0.0-SNAPSHOT</version>
<modules>
<module>xx-api</module>
<module>xx-service</module>
</modules>
<distributionManagement>
<repository>
<id>nexus-snapshots</id>
<name>Nexus snapshots</name>
<url>http://xxxxxxxx</url>
</repository>
</distributionManagement>
<properties>
<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
<project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding>
<java.version>1.8</java.version>
<spring-cloud.version>Hoxton.SR12</spring-cloud.version>
<spring-cloud-alibaba.version>2.2.7.RELEASE</spring-cloud-alibaba.version>
<obs.version>[3.21.11,)</obs.version>
<dubbo.version>2.2.7.RELEASE</dubbo.version>
<mybatisplus.version>3.5.1</mybatisplus.version>
</properties>
<dependencyManagement>
<dependencies>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-dependencies</artifactId>
<version>2.3.12.RELEASE</version>
<type>pom</type>
<scope>import</scope>
</dependency>
<dependency>
<groupId>org.springframework.cloud</groupId>
<artifactId>spring-cloud-dependencies</artifactId>
<version>${spring-cloud.version}</version>
<type>pom</type>
<scope>import</scope>
</dependency>
<dependency>
<groupId>com.alibaba.cloud</groupId>
<artifactId>spring-cloud-alibaba-dependencies</artifactId>
<version>${spring-cloud-alibaba.version}</version>
<type>pom</type>
<scope>import</scope>
</dependency>
</dependencies>
</dependencyManagement>
<dependencies>
<dependency>
<groupId>org.projectlombok</groupId>
<artifactId>lombok</artifactId>
</dependency>
<!--这个依赖一定要有,不然会报错跑不起来 -->
<dependency>
<groupId>com.alibaba.spring</groupId>
<artifactId>spring-context-support</artifactId>
<version>1.0.11</version>
</dependency>
</dependencies>
<repositories>
<repository>
<id>nexus</id>
<url>http://xxxxxxx</url>
</repository>
<repository>
<id>nexus-snapshot</id>
<url>http://xxxx</url>
</repository>
</repositories>
</project>
子模块pom
<?xml version="1.0" encoding="UTF-8"?>
<project xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xmlns="http://maven.apache.org/POM/4.0.0"
xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
<parent>
<artifactId>xx-xx</artifactId>
<groupId>com.xx.xx</groupId>
<version>1.0.0-SNAPSHOT</version>
</parent>
<modelVersion>4.0.0</modelVersion>
<artifactId>xxx-service</artifactId>
<properties>
<maven.compiler.source>8</maven.compiler.source>
<maven.compiler.target>8</maven.compiler.target>
<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
<weixin-java.version>4.5.4.B</weixin-java.version>
<redisson.version>3.13.4</redisson.version>
<itextpdf.version>5.5.13</itextpdf.version>
<pdfbox.version>2.0.25</pdfbox.version>
</properties>
<dependencies>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-web</artifactId>
</dependency>
<dependency>
<groupId>com.alibaba.cloud</groupId>
<artifactId>spring-cloud-starter-alibaba-nacos-discovery</artifactId>
</dependency>
<dependency>
<groupId>com.alibaba.cloud</groupId>
<artifactId>spring-cloud-starter-alibaba-nacos-config</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-test</artifactId>
<scope>test</scope>
</dependency>
<!-- dubbo的starter -->
<dependency>
<groupId>com.alibaba.cloud</groupId>
<artifactId>spring-cloud-starter-dubbo</artifactId>
<version>${dubbo.version}</version>
</dependency>
<dependency>
<groupId>cn.hutool</groupId>
<artifactId>hutool-all</artifactId>
<version>5.8.8</version>
</dependency>
</dependencies>
<build>
<plugins>
<plugin>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-maven-plugin</artifactId>
<version>2.3.12.RELEASE</version>
<configuration>
<!-- 指定该Main Class为全局的唯一入口 -->
<mainClass>com.xx.xx.Application</mainClass>
</configuration>
<executions>
<execution>
<goals>
<goal>repackage</goal><!--可以把依赖的包都打包到生成的Jar包中-->
</goals>
</execution>
</executions>
</plugin>
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-resources-plugin</artifactId>
<configuration>
<nonFilteredFileExtensions>
<nonFilteredFileExtension>pem</nonFilteredFileExtension>
</nonFilteredFileExtensions>
</configuration>
</plugin>
</plugins>
</build>
</project>
3.验证
重启服务提供者后，不需要在重启服务消费者，服务消费者可以正常调用到服务服务提供者的接口的，亲测有效的。
4.总结
实在是抱歉，之前写了一篇坑文，这都是一个实践总结的过程，所以说明了一点，只有对源码足够的熟悉才可以去修改，后面估计是maven的各种依赖的问题导致那两种方案后不可以，后面又写了一版是这种的，新增一个事件监听的类：
@Component
@Slf4j
public class DubboStartListener {
@EventListener
public void start(InstancePreRegisteredEvent event) {
log.info("==============dubbo启动开始=================");
DubboBootstrap dubboBootstrap = DubboBootstrap.getInstance();
dubboBootstrap.start();
log.info("==============dubbo启动结束==================");
}
}
然后只修改DubboBootstrapApplicationListener类：
/*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF licenses this file to You 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
*
* http://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.apache.dubbo.config.spring.context;
import org.apache.dubbo.config.bootstrap.DubboBootstrap;
import org.springframework.context.ApplicationListener;
import org.springframework.context.event.ApplicationContextEvent;
import org.springframework.context.event.ContextClosedEvent;
import org.springframework.context.event.ContextRefreshedEvent;
import org.springframework.core.Ordered;
/**
* The {@link ApplicationListener} for {@link DubboBootstrap}'s lifecycle when the {@link ContextRefreshedEvent}
* and {@link ContextClosedEvent} raised
*
* @since 2.7.5
*/
public class DubboBootstrapApplicationListener extends OneTimeExecutionApplicationContextEventListener
implements Ordered {
/**
* The bean name of {@link DubboBootstrapApplicationListener}
*
* @since 2.7.6
*/
public static final String BEAN_NAME = "dubboBootstrapApplicationListener";
private final DubboBootstrap dubboBootstrap;
public DubboBootstrapApplicationListener() {
this.dubboBootstrap = DubboBootstrap.getInstance();
}
@Override
public void onApplicationContextEvent(ApplicationContextEvent event) {
if (event instanceof ContextRefreshedEvent) {
//onContextRefreshedEvent((ContextRefreshedEvent) event);
} else if (event instanceof ContextClosedEvent) {
onContextClosedEvent((ContextClosedEvent) event);
}
}
private void onContextRefreshedEvent(ContextRefreshedEvent event) {
dubboBootstrap.start();
}
private void onContextClosedEvent(ContextClosedEvent event) {
dubboBootstrap.stop();
}
@Override
public int getOrder() {
return LOWEST_PRECEDENCE;
}
}
NacosUpDown这个类移除和其它dubbo源码修改的类移除后，这种方式在本地跑起来是可以正常注册到公司测试环境的nacos上的，dubbo的服务的元数据不为：
dubbo preserved.register.source
但是这种方式部署测试环境后还是不得行，修改源码就是会破坏顺序和流程，开源官方写的东西也是有bug的所以只有升级版本试下可不可以解决，或者熟读源码然后试着去修复，改着玩一样的，希望我的分享对你有帮助，请一键三连么么么哒。
原文作者：Java大飞哥；如有侵权，请联系管理员删除。
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