问题描述：

在dubbo中，启动springboot，启动出错。出错描述为：

Initialization of bean failed; nested exception is java.lang.IllegalStateException

具体描述为：

org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'org.apache.dubbo.spring.boot.autoconfigure.DubboAutoConfiguration': Initialization of bean failed; nested exception is java.lang.IllegalStateException: Failed to create adaptive instance: java.lang.IllegalStateException: Can't create adaptive extension interface org.apache.dubbo.common.extension.ExtensionFactory, cause: Extension instance (name: adaptive, class: interface org.apache.dubbo.common.extension.ExtensionFactory) couldn't be instantiated: Could not initialize class com.alibaba.dubbo.common.logger.LoggerFactory

看了各种类型的文章之后，有很多种解释，我都试过解决不成功。

问题分析：
最后我发现：出错的原因是在serviceImpl层中的注解有问题。

由于maven仓库中我们添加dubbo的springboot依赖为

<!--添加dubbo的springboot依赖-->
        <!-- https://mvnrepository.com/artifact/org.apache.dubbo/dubbo-spring-boot-starter -->
        <dependency>
            <groupId>org.apache.dubbo</groupId>
            <artifactId>dubbo-spring-boot-starter</artifactId>
            <version>2.7.8</version>
        </dependency>

之后我们会在serviceImpl层中通过导入dubbo的@Service注解

import org.apache.dubbo.config.annotation.Service;
//声明这是一个dubbo服务
@Service(version = "1.0.0")

我们会发现@Service被划掉。

最后我们就会报上述的错误。

解决方案：

<!--添加dubbo的springboot依赖-->
<!-- https://mvnrepository.com/artifact/org.apache.dubbo/dubbo-spring-boot-starter -->
<dependency>
    <groupId>org.apache.dubbo</groupId>
    <artifactId>dubbo-spring-boot-starter</artifactId>
    <version>2.7.8</version>
</dependency>

在这个pom.xml文中dubbo对springboot的依赖修改为：

<!--添加dubbo的springboot依赖-->
<dependency>
     <groupId>com.alibaba.boot</groupId>
     <artifactId>dubbo-spring-boot-starter</artifactId>
     <version>0.2.0</version>
 </dependency>

修改完成后，一定要在idea右方重新刷新一下依赖。
之后在ServiceImpl层，将Service的导入换成

import com.alibaba.dubbo.config.annotation.Service;

这个就算改了pom文件也不会自动导入，需要手动导入。
这样就能解决上述问题。开启启动类即可。

附属我的代码

itcast-dubbo-service的pom.xml代码：

<?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">
    <parent>
        <artifactId>itcast-dubbo</artifactId>
        <groupId>cn.itcast.dubbo</groupId>
        <version>1.0-SNAPSHOT</version>
    </parent>
    <modelVersion>4.0.0</modelVersion>

    <artifactId>itcast-dubbo-service</artifactId>

    <dependencies>
        <!--  添加springboot依赖，非web项目      -->
        <!-- https://mvnrepository.com/artifact/org.springframework.boot/spring-boot-starter -->
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter</artifactId>
            <version>2.3.2.RELEASE</version>
        </dependency>
        <!--   以下两个依赖必须要有，要不然不能将服务的提供者连接到我们的zookeeper的注册中心     -->
        <dependency>
            <groupId>org.apache.zookeeper</groupId>
            <artifactId>zookeeper</artifactId>
            <version>3.4.13</version>
        </dependency>
        <dependency>
            <groupId>com.github.sgroschupf</groupId>
            <artifactId>zkclient</artifactId>
            <version>0.1</version>
        </dependency>

    </dependencies>

</project>

itcast-dubbo的代码：

<?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>

    <!--添加SpringBoot parent支持-->
    <parent>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-parent</artifactId>
        <version>2.1.0.RELEASE</version>
    </parent>

    <groupId>cn.itcast.dubbo</groupId>
    <artifactId>itcast-dubbo</artifactId>
    <packaging>pom</packaging>
    <version>1.0-SNAPSHOT</version>
    <modules>
        <module>itcast-dubbo-service</module>
    </modules>

    <dependencies>
        <!--添加SpringBoot测试-->
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-test</artifactId>
            <scope>test</scope>
        </dependency>

        <!--添加dubbo的springboot依赖-->
        <dependency>
            <groupId>com.alibaba.boot</groupId>
            <artifactId>dubbo-spring-boot-starter</artifactId>
            <version>0.2.0</version>
        </dependency>

        <!--添加dubbo依赖-->
        <dependency>
            <groupId>com.alibaba</groupId>
            <artifactId>dubbo</artifactId>
            <version>2.6.4</version>
        </dependency>

    </dependencies>

    <build>
        <plugins>
            <!--添加springboot的maven插件-->
            <plugin>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-maven-plugin</artifactId>
            </plugin>
        </plugins>
    </build>


</project>

其余的就靠自己咯。