1. 问题描述

记录一个很有意思的问题，父工程A下边两个模块B与C，B依赖6.0.16.Final版本hibernate-validator，C依赖B，但是C中hibernate-validator版本竟然是6.2.0.Final。
如图所示：
在这里插入图片描述

2. 问题分析

原因是在父类spring-boot-starter-parent的spring-boot-dependencies中定义了hibernate-validator.version 版本号6.2.0.Final。

test-common中显示的指明了hibernate-validator版本号位6.0.16.Final，而在打包的时候仍然引用的是spring-boot-starter-paren父类中定义的版本号6.2.0.Final。

所以才会出现test-common中是6.0.16，test-web虽然引用了test-common，但是引用的并不是项目中的tets-common，而是打成jar包的test-common，而打成jar包的test-common依赖的是父类中定义的6.2.0版本。

这个可以通过mvnHelp或者打出mvn依赖树分析

2.1 maven help插件分析

打开pom文件，左下角txt切换到Dependency Analyzer
在这里插入图片描述

2.2 maven依赖树分析

## cd 到pom文件根目录，执行mvn dependency:tree > tree.txt
D:\work\ennwork\test\test-common>mvn dependency:tree > tree.txt

在这里插入图片描述

2.3 父类定义版本

父类pom

org.springframework.boot
spring-boot-starter-parent
2.5.2
spring-boot-starter-parent-2.5.2.pom

org.springframework.boot
spring-boot-dependencies
2.5.2
spring-boot-dependencies-2.5.2.pom,这个就是打包所引用的依赖。

5.4.32.Final
```
<hibernate-validator.version>6.2.0.Final</hibernate-validator.version>
```

3. 解决方案

解决方案就是排除父类中定义版本的依赖，从新引入新版本依赖。当然也可以与父类版本依赖保持一致。

<dependency>
            <groupId>com.example</groupId>
            <artifactId>common-customize-core</artifactId>
            <version>0.0.1-SNAPSHOT</version>
            <exclusions>
                <exclusion>
                    <groupId>org.apache.commons</groupId>
                    <artifactId>commons-lang3</artifactId>
                </exclusion>
            </exclusions>
        </dependency>
        <dependency>
            <groupId>org.apache.commons</groupId>
            <artifactId>commons-lang3</artifactId>
            <version>3.7</version>
        </dependency>

4.项目pom

4.1 父类依赖

<?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>
    <groupId>com.example</groupId>
    <artifactId>test</artifactId>
    <version>1.0.0-SNAPSHOT</version>
    <name>test</name>
    <packaging>pom</packaging>
    <parent>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-parent</artifactId>
        <version>2.5.2</version>
        <relativePath/>
    </parent>
    <properties>
        <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
        <project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding>
        <maven.compiler.source>1.8</maven.compiler.source>
        <maven.compiler.target>1.8</maven.compiler.target>
        <java.version>1.8</java.version>
        <test-common.version>1.0.0-SNAPSHOT</test-common.version>
        <rdfa.framework.version>1.4.0-RELEASE</rdfa.framework.version>
    </properties>
    <modules>
        <module>test-common</module>
        <module>test-web</module>
    </modules>
    <dependencies>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
        </dependency>
        <dependency>
            <groupId>org.projectlombok</groupId>
            <artifactId>lombok</artifactId>
            <optional>true</optional>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-test</artifactId>
            <scope>test</scope>
        </dependency>
    </dependencies>
    <build>
        <plugins>
            <plugin>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-maven-plugin</artifactId>
                <configuration>
                    <excludes>
                        <exclude>
                            <groupId>org.projectlombok</groupId>
                            <artifactId>lombok</artifactId>
                        </exclude>
                    </excludes>
                </configuration>
            </plugin>
        </plugins>
    </build>
</project>

4.2 子模块test-common依赖

<?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>
        <artifactId>test</artifactId>
        <groupId>com.example</groupId>
        <version>1.0.0-SNAPSHOT</version>
    </parent>
    <artifactId>test-common</artifactId>
    <properties>
        <spring-cloud.version>Hoxton.SR8</spring-cloud.version>
        <spring-boot.version>2.3.2.RELEASE</spring-boot.version>
        <project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding>
        <java.version>1.8</java.version>
        <maven.compiler.source>1.8</maven.compiler.source>
        <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
        <maven.compiler.target>1.8</maven.compiler.target>
    </properties>
    <dependencies>
        <dependency>
            <groupId>org.hibernate.validator</groupId>
            <artifactId>hibernate-validator</artifactId>
            <version>6.0.16.Final</version>
        </dependency>
    </dependencies>
</project>

4.3 子模块test-web依赖

<?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>
        <artifactId>test</artifactId>
        <groupId>com.example</groupId>
        <version>1.0.0-SNAPSHOT</version>
    </parent>
    <artifactId>test-web</artifactId>
    <packaging>jar</packaging>
    <dependencies>
        <dependency>
            <groupId>com.example</groupId>
            <artifactId>test-common</artifactId>
            <version>1.0.0-SNAPSHOT</version>
            <scope>provided</scope>
        </dependency>
    </dependencies>
    <build>
        <resources>
            <resource>
                <directory>src/main/resources</directory>
                <filtering>true</filtering>
            </resource>
        </resources>
        <plugins>
            <plugin>
                <groupId>org.mybatis.generator</groupId>
                <artifactId>mybatis-generator-maven-plugin</artifactId>
                <version>1.3.7</version>
                <configuration>
                    <verbose>true</verbose>
                    <overwrite>true</overwrite>
                </configuration>
                <dependencies>
                    <dependency>
                        <groupId>mysql</groupId>
                        <artifactId>mysql-connector-java</artifactId>
                        <version>8.0.21</version>
                    </dependency>
                </dependencies>
            </plugin>
        </plugins>
    </build>
</project>