記錄一下maven子模組依賴父類模組版本報錯問題
阿新 • • 發佈：2021-07-01
之前也是經常遇到版本依賴報錯問題，由於時間緊就都是把依賴複製了一份到子模組，今天練習專案又遇到了這個問題
問題重現一下
1.父類模組通過<properties>管理版本，通過<dependencyManagement>管理依賴
<?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> <modules> <module>common</module> <module>infrastructure</module> <module>service</module> </modules> <parent> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-parent</artifactId> <version>2.2.1.RELEASE</version> <relativePath/> <!-- lookup parent from repository --> </parent> <groupId>com.wang</groupId> <artifactId>acl_parent</artifactId> <packaging>pom</packaging> <version>0.0.1-SNAPSHOT</version> <name>acl_parent</name> <description>Demo project for Spring Boot</description> <properties> <java.version>1.8</java.version> <mybatis-plus.version>3.0.5</mybatis-plus.version> <velocity.version>2.0</velocity.version> <swagger.version>2.7.0</swagger.version> <jwt.version>0.7.0</jwt.version> <fastjson.version>1.2.28</fastjson.version> <gson.version>2.8.2</gson.version> <json.version>20170516</json.version> <cloud-alibaba.version>0.2.2.RELEASE</cloud-alibaba.version> </properties> <dependencyManagement> <dependencies> <!--Spring Cloud--> <dependency> <groupId>org.springframework.cloud</groupId> <artifactId>spring-cloud-dependencies</artifactId> <version>Hoxton.RELEASE</version> <type>pom</type> <scope>import</scope> </dependency> <dependency> <groupId>org.springframework.cloud</groupId> <artifactId>spring-cloud-alibaba-dependencies</artifactId> <version>${cloud-alibaba.version}</version> <type>pom</type> <scope>import</scope> </dependency> <!--mybatis-plus 持久層--> <dependency> <groupId>com.baomidou</groupId> <artifactId>mybatis-plus-boot-starter</artifactId> <version>${mybatis-plus.version}</version> </dependency> <!-- velocity 模板引擎, Mybatis Plus 程式碼生成器需要 --> <dependency> <groupId>org.apache.velocity</groupId> <artifactId>velocity-engine-core</artifactId> <version>${velocity.version}</version> </dependency> <dependency> <groupId>com.google.code.gson</groupId> <artifactId>gson</artifactId> <version>${gson.version}</version> </dependency> <!--swagger--> <dependency> <groupId>io.springfox</groupId> <artifactId>springfox-swagger2</artifactId> <version>${swagger.version}</version> </dependency> <!--swagger ui--> <dependency> <groupId>io.springfox</groupId> <artifactId>springfox-swagger-ui</artifactId> <version>${swagger.version}</version> </dependency> <!-- JWT --> <dependency> <groupId>io.jsonwebtoken</groupId> <artifactId>jjwt</artifactId> <version>${jwt.version}</version> </dependency> <dependency> <groupId>com.alibaba</groupId> <artifactId>fastjson</artifactId> <version>${fastjson.version}</version> </dependency> <dependency> <groupId>org.json</groupId> <artifactId>json</artifactId> <version>${json.version}</version> </dependency> </dependencies> </dependencyManagement> <build> <plugins> <plugin> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-maven-plugin</artifactId> </plugin> </plugins> </build> </project>
2.新建子模組<module>common</module>
引入父類管理的依賴
<?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>acl_parent</artifactId> <groupId>com.wang</groupId> <version>0.0.1-SNAPSHOT</version> <!--<relativePath></relativePath>--> </parent> <modelVersion>4.0.0</modelVersion> <artifactId>common</artifactId> <packaging>pom</packaging> <modules> <module>service_base</module> <module>spring_security</module> </modules> <dependencies> <dependency> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-web</artifactId> <scope>provided </scope> </dependency> <!--mybatis-plus--> <dependency> <groupId>com.baomidou</groupId> <artifactId>mybatis-plus-boot-starter</artifactId> <scope>provided </scope> </dependency> <!--lombok用來簡化實體類：需要安裝lombok外掛--> <dependency> <groupId>org.projectlombok</groupId> <artifactId>lombok</artifactId> <scope>provided </scope> </dependency> <!--swagger--> <dependency> <groupId>io.springfox</groupId> <artifactId>springfox-swagger2</artifactId> <scope>provided </scope> </dependency> <dependency> <groupId>io.springfox</groupId> <artifactId>springfox-swagger-ui</artifactId> <scope>provided </scope> </dependency> <!-- redis --> <dependency> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-data-redis</artifactId> </dependency> <!-- spring2.X整合redis所需common-pool2--> <dependency> <groupId>org.apache.commons</groupId> <artifactId>commons-pool2</artifactId> <version>2.6.0</version> </dependency> </dependencies> </project>
結果子模組版本問題報錯
通過查詢網上相關問題最終發現是子模組專案沒有新增標籤<relativePath></relativePath>
加上<relativePath></relativePath>就可以了
預設值為../pom.xml(但是我加上../pom.xml還是報錯 空標籤就沒有報錯了)
點進原始碼可以看到首先maven從當前專案的父pom查詢，然後從檔案系統，然後是本地儲存庫，最後是遠端倉庫。
Maven looks for the parent pom first in the reactor of currently building projects, then in this location on
the filesystem, then the local repository, and lastly in the remote repo.
查詢順序：relativePath元素中的地址–本地倉庫–遠端倉庫
設定一個空值將始終從倉庫中獲取，不從本地路徑獲取。
先這樣 還是沒有完全搞懂