关于自定义Spring Boot 的 Starter

Question

问题描述

我搜寻了一下自定义starter的文章 发现大多文章都是你抄我 我粘你
问题 :

• 我自定义了一个 Starter -- A

  • A 需要依赖其他框架 C

• 另外一个项目 B pom中引入了 A 项目 但是发现运行抛出class not found 的错误

  • 就是 A 项目的pom中引入了依赖
  • 但是 C项目中没有引用 A 项目中的依赖

猜想: 不是父子项目,依赖无法正常传递

问题出现的环境背景及自己尝试过哪些方法

• A 项目为 Maven 项目
• B 项目为 Springboot 项目

目前是 B 项目在自己的pom中引入一下 A 项目的 C 依赖

相关代码

A 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>
    <groupId>com.yq_qm</groupId>
    <artifactId>logger-spring-boot-starter</artifactId>
    <version>0.4.9</version>
    <packaging>jar</packaging>
    <properties>
        <maven.compiler.source>8</maven.compiler.source>
        <maven.compiler.target>8</maven.compiler.target>
        <!-- 统一版本为2.2.6     -->
 <org.springframework.boot.version>2.2.6.RELEASE</org.springframework.boot.version>
        <!--   FAST JSON 版本声明 -->
 <java.fastjson.version>1.2.47</java.fastjson.version>
    </properties>
    <dependencyManagement>
        <dependencies>
            <dependency>
                <!-- Import dependency management from Spring Boot,not include plugin
 management as the parent import style --> <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-dependencies</artifactId>
                <version>${org.springframework.boot.version}</version>
                <!--                <optional>true</optional>-->
 <type>pom</type>
                <scope>import</scope>
            </dependency>
        </dependencies>
    </dependencyManagement>
    <dependencies>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-autoconfigure</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-configuration-processor</artifactId>
            <optional>true</optional>
        </dependency>
        <!--aop 面向切面-->
 <!--        <dependency>--> <!--            <groupId>org.springframework.boot</groupId>--> <!--            <artifactId>spring-boot-starter-aop</artifactId>--> <!--            <optional>true</optional>--> <!--        </dependency>-->
 <!--Kafka 依赖-->
 <dependency>
            <groupId>org.springframework.kafka</groupId>
            <artifactId>spring-kafka</artifactId>
            <optional>false</optional>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
            <optional>true</optional>
        </dependency>
        <dependency>
            <groupId>org.projectlombok</groupId>
            <artifactId>lombok</artifactId>
            <optional>true</optional>
        </dependency>
        <dependency>
            <groupId>com.alibaba</groupId>
            <artifactId>fastjson</artifactId>
            <version>${java.fastjson.version}</version>
            <optional>true</optional>
        </dependency>
    </dependencies>
    <build>
        <plugins>
            <plugin>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-maven-plugin</artifactId>
            </plugin>
        </plugins>
    </build>
</project>

B 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 https://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>2.4.4</version>
        <relativePath/> <!-- lookup parent from repository -->
 </parent>
    <groupId>com.faw_qm</groupId>
    <artifactId>ad_log</artifactId>
    <version>0.0.1-SNAPSHOT</version>
    <name>ad_log</name>
    <description>Logger Servers</description>
    <properties>
        <java.version>1.8</java.version>
    </properties>
    <dependencies>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-devtools</artifactId>
            <scope>runtime</scope>
            <optional>true</optional>
        </dependency>
        <dependency>
            <groupId>org.projectlombok</groupId>
            <artifactId>lombok</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-test</artifactId>
            <scope>test</scope>
        </dependency>
        <!--aop 面向切面-->
 <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-aop</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-data-mongodb</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.kafka</groupId>
            <artifactId>spring-kafka</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.cloud</groupId>
            <artifactId>spring-cloud-starter-openfeign</artifactId>
        </dependency>
        <dependency>
            <groupId>com.alibaba</groupId>
            <artifactId>fastjson</artifactId>
            <version>1.2.47</version>
            <optional>true</optional>
        </dependency>
    </dependencies>

你期待的结果是什么？实际看到的错误信息又是什么？

Answer 1

使用 mvn dependency:tree 查看项目的依赖情况。