无法导入类，都依赖一个父类，如何解决？

问题遇到的现象和发生背景

初学项目中，到了项目导入的时候发现无法导入另一个模块的类

无法找到这个类，

下面是他们的关系图

parent是父类，其他都继承于他

用代码块功能插入代码，请勿粘贴截图

ihrm_parent的pom.xml文件

<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>4.0.0modelVersion>

    <groupId>com.ihrmgroupId>
    <artifactId>ihrm_parentartifactId>
    <version>1.0-SNAPSHOTversion>
    <modules>
        <module>./ihrm_commonmodule>
        <module>./ihrm_common_modelmodule>
        <module>./ihrm_companymodule>
    modules>
    <properties>
        <maven.compiler.source>8maven.compiler.source>
        <maven.compiler.target>8maven.compiler.target>
        <project.build.sourceEncoding>UTF-8project.build.sourceEncoding>
        <project.reporting.outputEncoding>UTF-8project.reporting.outputEncoding>
        <java.version>1.8java.version>
        <fastjson.version>1.2.47fastjson.version>
    properties>
    <packaging>pompackaging>
    <name>ihrm_parentname>
    <description>IHRM-黑马程序员description>
    <parent>
        <groupId>org.springframework.bootgroupId>
        <artifactId>spring-boot-starter-parentartifactId>
        <version>2.4.5version>
        <relativePath/>
    parent>
    <dependencies>
        <dependency>
            <groupId>org.springframework.bootgroupId>
            <artifactId>spring-boot-starter-webartifactId>
        dependency>
        <dependency>
            <groupId>org.springframework.bootgroupId>
            <artifactId>spring-boot-starter-loggingartifactId>
        dependency>
        <dependency>
            <groupId>org.springframework.bootgroupId>
            <artifactId>spring-boot-starter-testartifactId>
            <scope>testscope>
        dependency>
        <dependency>
            <groupId>com.alibabagroupId>
            <artifactId>fastjsonartifactId>
            <version>${fastjson.version}version>
        dependency>
        <dependency>
            <groupId>org.projectlombokgroupId>
            <artifactId>lombokartifactId>
            <version>1.18.18version>
        dependency>
    dependencies>
    <repositories>
        <repository>
            <id>spring-snapshotsid>
            <name>Spring Snapshotsname>
            <url>https://repo.spring.io/snapshoturl>
            <snapshots>
                <enabled>trueenabled>
            snapshots>
        repository>
        <repository>
            <id>spring-milestonesid>
            <name>Spring Milestonesname>
            <url>https://repo.spring.io/milestoneurl>
            <snapshots>
                <enabled>falseenabled>
            snapshots>
        repository>
    repositories>
    <pluginRepositories>
        <pluginRepository>
            <id>spring-snapshotsid>
            <name>Spring Snapshotsname>
            <url>https://repo.spring.io/snapshoturl>
            <snapshots>
                <enabled>trueenabled>
            snapshots>
        pluginRepository>
        <pluginRepository>
            <id>spring-milestonesid>
            <name>Spring Milestonesname>
            <url>https://repo.spring.io/milestoneurl>
            <snapshots>
                <enabled>falseenabled>
            snapshots>
        pluginRepository>
    pluginRepositories>
    <build>
        <plugins>
            
            <plugin>
                <groupId>org.apache.maven.pluginsgroupId>
                <artifactId>maven-compiler-pluginartifactId>
                <version>3.1version>
                <configuration>
                    <source>${java.version}source>
                    <target>${java.version}target>
                configuration>
            plugin>
            
            <plugin>
                <groupId>org.apache.maven.pluginsgroupId>
                <artifactId>maven-surefire-pluginartifactId>
                <version>2.12.4version>
                <configuration>
                    <skipTests>trueskipTests>
                configuration>
            plugin>
        plugins>
    build>
project>

这是ihrm_common_model的pom文件：

<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>ihrm_parentartifactId>
        <groupId>com.ihrmgroupId>
        <version>1.0-SNAPSHOTversion>
    parent>
    <modelVersion>4.0.0modelVersion>
    <artifactId>ihrm_common_modelartifactId>
    <properties>
        <maven.compiler.source>8maven.compiler.source>
        <maven.compiler.target>8maven.compiler.target>
    properties>
    <dependencies>
        <dependency>
            <groupId>org.springframework.bootgroupId>
            <artifactId>spring-boot-starter-data-jpaartifactId>
        dependency>
        <dependency>
            <groupId>com.ihrmgroupId>
            <artifactId>ihrm_commonartifactId>
            <version>1.0-SNAPSHOTversion>
        dependency>
    dependencies>
project>

这是ihrm_company的pom文件

<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>ihrm_parentartifactId>
        <groupId>com.ihrmgroupId>
        <version>1.0-SNAPSHOTversion>
    parent>
    <modelVersion>4.0.0modelVersion>
    <artifactId>ihrm_companyartifactId>
    <properties>
        <maven.compiler.source>8maven.compiler.source>
        <maven.compiler.target>8maven.compiler.target>
    properties>
    <dependencies>
        <dependency>
            <groupId>org.springframework.bootgroupId>
            <artifactId>spring-boot-starter-data-jpaartifactId>
        dependency>
        <dependency>
            <groupId>mysqlgroupId>
            <artifactId>mysql-connector-javaartifactId>
        dependency>
        <dependency>
            <groupId>com.ihrmgroupId>
            <artifactId>ihrm_commonartifactId>
            <version>1.0-SNAPSHOTversion>
        dependency>
    dependencies>
project>

运行结果及报错内容

结果就是

这到底是是怎么回事？
求详解！

我想要达到的结果

解决问题，了解出现问题原因

请确认你的CompanyDao和Company类分别在哪个项目里面。在不同的项目时，需要先添加依赖。

看你这个情况应该是这两个类不在一个项目里面。

如果CompanyDao在ihrm_company这个项目中，Company在ihrm_common_model这个项目中时，
ihrm_company要引用ihrm_common_model的类，需要在ihrm_company的pom中添加依赖：

<dependency>
            <groupId>com.ihrm</groupId>
            <artifactId>ihrm_common_model</artifactId>
            <version>1.0-SNAPSHOT</version>
        </dependency>

哪个项目要引用哪个项目？
如果是A项目要引用B项目，在A项目的pom.xml下面加入B项目，类似下面这样子

<dependencyManagement>
        <dependencies>
            <dependency>
                <groupId>项目路径</groupId>
                <artifactId>B项目</artifactId>
                <version>0.0.1-SNAPSHOT</version>
            </dependency>
        </dependencies>
    </dependencyManagement>