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具体描述：

Non-resolvable parent POM: Could not find artifact

具体例子：

root下的pom文件

<?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>lab-67</artifactId>-->
        <groupId>cn.iocoder.springboot.labs</groupId>
        <version>1.0-SNAPSHOT</version>
<!--    </parent>-->
    <modelVersion>4.0.0</modelVersion>

    <artifactId>lab-67-netty-demo</artifactId>
    <packaging>pom</packaging>
    <modules>
        <module>lab-67-netty-demo-server</module>
        <module>lab-67-netty-demo-client</module>
        <module>lab-67-netty-demo-common</module>
    </modules>
    
</project>

子module下的文件

<?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>lab-67-netty-demo</artifactId>
        <groupId>cn.iocoder.springboot.labs</groupId>
        <version>1.0-SNAPSHOT</version>
    </parent>
    <modelVersion>4.0.0</modelVersion>

    <artifactId>lab-67-netty-demo-client</artifactId>

    <properties>
        <!-- 依赖相关配置 -->
        <spring.boot.version>2.2.4.RELEASE</spring.boot.version>
        <!-- 插件相关配置 -->
        <maven.compiler.target>1.8</maven.compiler.target>
        <maven.compiler.source>1.8</maven.compiler.source>
    </properties>

    <dependencyManagement>
        <dependencies>
            <dependency>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-starter-parent</artifactId>
                <version>${spring.boot.version}</version>
                <type>pom</type>
                <scope>import</scope>
            </dependency>
        </dependencies>
    </dependencyManagement>

    <dependencies>
        <!-- 实现对 Spring MVC 的自动化配置 -->
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
        </dependency>

        <!-- Netty 依赖 -->
        <dependency>
            <groupId>io.netty</groupId>
            <artifactId>netty-all</artifactId>
            <version>4.1.50.Final</version>
        </dependency>

        <!-- 引入 netty-demo-common 封装 -->
        <dependency>
            <groupId>cn.iocoder.springboot.labs</groupId>
            <artifactId>lab-67-netty-demo-common</artifactId>
            <version>1.0-SNAPSHOT</version>
        </dependency>
    </dependencies>

</project>

解决方式：

root下pom的parent标签删除，保留parent内部的子标签即可。