基本信息
仓库信息
Maven 中引入了仓库的概念，开发人员将所编写的 JAR 按照相应格式推送到仓库中。
其他开发者需要引用这个 jar 包时，在工程中引用相应依赖，则会先从本地仓库进行下载。对于部分组织或机构，通常会在此基础上额外搭建私人仓库。
在引用依赖时会先从私人仓库进行读取，如果未找到再从中央仓库下载至私人仓库，最后再下载到本地仓库。
通过这种方式开发者则无需再手动管理繁杂的项目 JAR 包，从而实现更高的效率。
配置信息
一个最基本的 Maven 项目通常应包含如下内容，当我们引用一个模块时，也是通过 groupId、 artifactId、 version AVG 三项内容进行确定
groupId 通常为组织或公司域名反写。
artifactId 项目的名称。
version 项目的版本信息
name 项目的简称
description 项目的简要描述
举个例子
依赖管理
依赖引入
通过 dependencies 标签我们即可导入所需要的工程依赖。
<dependencies> <dependency> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-mail</artifactId> <version>xxxx</version> <scope>runtime</scope> <optional>true</optional> </dependency> </dependencies>
其中
compile 编译时需要用到该 JAR 包（默认）
runtime 编译时不需要，但运行时需要用到。
provided 编译时需要用到，但运行时由 JDK 或某个服务器提供。
test 编译Test时需要用到该 JAR 包。
optional 标签禁用依赖传递
间接依赖
当项目需要引用到其它依赖时，只需指定所依赖的工程的基本信息即可，剩下的一切都交给 Maven 处理。即便是所要依赖的工程依赖了其它工程，我们也只需引入项目所直接的依赖的工程。
依赖顺序
在 maven 工程中遵循先定义先导入的原则，即当存在多个相同间接依赖，优先导入其父依赖定义在前的简洁依赖。
举个例子，如工程中引入 Dependency-A 与 Dependency-B 两个依赖，二者又分别引用了不同版本的 Dependency-C ，但对于 Maven 而言最终编译时同一个依赖即便是不同的版本也只会选择一份。
其计算规则如下：若 Dependency-A 定义在 Dependency-B 之前则最终将导入 Dependency-A 中的 C-1.0 版本。
而在右侧图例中虽然 Dependency-A 引入优先级高于 Dependency-B ，但是 C-2.0 的间接依赖层级高于 C-1.0，因此将导入 C-2.0 版本。
依赖排除
在引用多个模块时可能会发生版本兼容冲突问题，通过 excludes 标签即可实现依赖排除。
在工程中引入了 demo-a 依赖，但其又引用 dependency-b 依赖，如想要在当前工程中移除 dependency-b 依赖，此时即可通过 excludes 标签将 dependency-b 排除依赖
<dependencies> <dependency> <groupId>com.artisan</groupId> <artifactId>demo-a</artifactId> <version>1.0.0</version> <excludes> <exclude> <groupId>com.little</groupId> <artifactId>dependency-b</artifactId> <version>1.0.0</version> </exclude> </excludes> </dependency> </dependencies>
除了手动通过 excludes 标签排除依赖，被引模块也可以在导入依赖时通过 optional 标签禁用依赖传递。
上述示例中若在 demo-a 工程中引入 dependency-b 依赖时添加 optional 标签，那么其它工程在引入 demo-a 依赖时将不会将 dependency-b 作为间接依赖导入
<dependencies> <dependency> <groupId>com.little</groupId> <artifactId>dependency-b</artifactId> <version>1.0.0</version> <optional>true</optional> </dependency> </dependencies>
变量配置
当项目中引入了大量依赖，为了方便管理通常将引入依赖的版本通过变量进行统一配置，从而实现更直观的依赖管理。
通过 properties 标签即可自定义变量配置，然后使用 ${} 引用变量
<properties> <mysql.version>8.0.30</mysql.version> <junit.version>4.13.2</junit.version> </properties> <dependencies> <dependency> <groupId>mysql</groupId> <artifactId>mysql-connector-java</artifactId> <!-- 使用 "${}" 引用上述自定义变量 --> <version>${mysql.version}</version> </dependency> <dependency> <groupId>junit</groupId> <artifactId>junit</artifactId> <version>${junit.version}</version> </dependency> </dependencies>
模块配置
当项目包含多个子项目时，通过 modules 标签即可实现模块管理。
模块管理
我们来看下nacos是如何通过modules管理子模块的
其中包含了 如下子模块
<!-- Submodule management --> <modules> <module>config</module> <module>core</module> <module>naming</module> <module>address</module> <module>test</module> <module>api</module> <module>client</module> <module>example</module> <module>common</module> <module>distribution</module> <module>console</module> <module>cmdb</module> <module>istio</module> <module>consistency</module> <module>auth</module> <module>sys</module> </modules>
模块继承
通过 parent 即可标记当前模块的父模块，且子模块将会继承父模块中的所有依赖配置。子模块若没有指定的 groupId 和 version 默认继承父模块中的配置。
其中 relativePath 用于指定父模块的 POM 文件目录，省略时默认值为 ../pom.xml 即当前目录的上一级中，若仍未找到则会在本地仓库中寻找。
我们以 nacos-naming 为例 看一下
关键信息如下：
<parent> <groupId>com.alibaba.nacos</groupId> <artifactId>nacos-all</artifactId> <version>${revision}</version> <relativePath>../pom.xml</relativePath> </parent> <modelVersion>4.0.0</modelVersion> <artifactId>nacos-naming</artifactId> <packaging>jar</packaging> <name>nacos-naming ${project.version}</name> <url>http://nacos.io</url>
其中parent就是 根POM的 AVG信息，如下
统一管理
依赖管理
假如项目中包含多个模块，且多个模块引用了相同依赖时显然重复引用是不太合适的，而通过 dependencyManagement 即可很好的解决依赖共用的问题。
将项目依赖统一定义在父模块的 dependencyManagement 标签中，子模块只需继承父模块并在 dependencies 引入所需的依赖，便可自动读取父模块 dependencyManagement 所指定的版本。
dependencyManagement 既不会在当前模块引入依赖，也不会给其子模块引入依赖，但其可以被继承的，只有在子模块下同样声明了该依赖，才会引入到模块中，子模块中只需在依赖中引入 groupId 与 artifactId 即可, 也可以指定版本则会进行覆盖。
举个例子
<?xml version="1.0" encoding="UTF-8"?> <!-- ~ Copyright 1999-2021 Alibaba Group Holding Ltd. ~ ~ Licensed under the Apache License, Version 2.0 (the "License"); ~ you may not use this file except in compliance with the License. ~ You may obtain a copy of the License at ~ ~ http://www.apache.org/licenses/LICENSE-2.0 ~ ~ Unless required by applicable law or agreed to in writing, software ~ distributed under the License is distributed on an "AS IS" BASIS, ~ WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. ~ See the License for the specific language governing permissions and ~ limitations under the License. --> <project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd"> <modelVersion>4.0.0</modelVersion> <inceptionYear>2018</inceptionYear> <groupId>com.alibaba.nacos</groupId> <artifactId>nacos-all</artifactId> <version>${revision}</version> <packaging>pom</packaging> <name>Alibaba NACOS ${project.version}</name> <description>Top Nacos project pom.xml file</description> <url>http://nacos.io</url> <prerequisites> <maven>3.2.5</maven> </prerequisites> <scm> <url>git@github.com:alibaba/nacos.git</url> <connection>scm:git@github.com:alibaba/nacos.git</connection> <developerConnection>scm:git@github.com:alibaba/nacos.git</developerConnection> <tag>nacos-all-${revision}</tag> </scm> <mailingLists> <mailingList> <name>Development List</name> <subscribe>dev-nacos+subscribe@googlegroups.com</subscribe> <unsubscribe>dev-nacos+unsubscribe@googlegroups.com</unsubscribe> <post>dev-nacos@googlegroups.com</post> </mailingList> <mailingList> <name>User List</name> <subscribe>users-nacos+subscribe@googlegroups.com</subscribe> <unsubscribe>users-nacos+unsubscribe@googlegroups.com</unsubscribe> <post>users-nacos@googlegroups.com</post> </mailingList> <mailingList> <name>Commits List</name> <subscribe>commits-nacos+subscribe@googlegroups.com</subscribe> <unsubscribe>commits-nacos+unsubscribe@googlegroups.com</unsubscribe> <post>commits-nacos@googlegroups.com</post> </mailingList> </mailingLists> <developers> <developer> <id>Alibaba Nacos</id> <name>Nacos</name> <url>http://nacos.io</url> <email>nacos_dev@linux.alibaba.com</email> </developer> </developers> <licenses> <license> <name>Apache License, Version 2.0</name> <url>http://www.apache.org/licenses/LICENSE-2.0</url> <distribution>repo</distribution> </license> </licenses> <organization> <name>Alibaba Group</name> <url>https://github.com/alibaba</url> </organization> <issueManagement> <system>github</system> <url>https://github.com/alibaba/nacos/issues</url> </issueManagement> <properties> <revision>2.1.0-SNAPSHOT</revision> <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding> <project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding> <!-- Compiler settings properties --> <maven.compiler.source>1.8</maven.compiler.source> <maven.compiler.target>1.8</maven.compiler.target> <!-- Maven properties --> <maven.test.skip>false</maven.test.skip> <maven.javadoc.skip>true</maven.javadoc.skip> <sonar.java.coveragePlugin>jacoco</sonar.java.coveragePlugin> <!-- Exclude all generated code --> <sonar.jacoco.itReportPath>${project.basedir}/../test/target/jacoco-it.exec</sonar.jacoco.itReportPath> <sonar.exclusions>file:**/generated-sources/**,**/test/**</sonar.exclusions> <!-- plugin version --> <versions-maven-plugin.version>2.2</versions-maven-plugin.version> <dependency-mediator-maven-plugin.version>1.0.2</dependency-mediator-maven-plugin.version> <clirr-maven-plugin.version>2.7</clirr-maven-plugin.version> <maven-enforcer-plugin.version>1.4.1</maven-enforcer-plugin.version> <maven-compiler-plugin.version>3.5.1</maven-compiler-plugin.version> <maven-javadoc-plugin.version>2.10.4</maven-javadoc-plugin.version> 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<version>${maven-javadoc-plugin.version}</version> <configuration> <charset>UTF-8</charset> </configuration> <executions> <execution> <id>attach-javadocs</id> <goals> <goal>jar</goal> </goals> </execution> </executions> </plugin> <plugin> <artifactId>maven-source-plugin</artifactId> <version>${maven-source-plugin.version}</version> <executions> <execution> <id>attach-sources</id> <goals> <goal>jar</goal> </goals> </execution> </executions> </plugin> <plugin> <groupId>org.apache.maven.plugins</groupId> <artifactId>maven-pmd-plugin</artifactId> <version>${maven-pmd-plugin.version}</version> <configuration> <rulesets> <ruleset>rulesets/java/ali-comment.xml</ruleset> <ruleset>rulesets/java/ali-concurrent.xml</ruleset> <ruleset>rulesets/java/ali-constant.xml</ruleset> <ruleset>rulesets/java/ali-exception.xml</ruleset> <ruleset>rulesets/java/ali-flowcontrol.xml</ruleset> <ruleset>rulesets/java/ali-naming.xml</ruleset> <ruleset>rulesets/java/ali-oop.xml</ruleset> <ruleset>rulesets/java/ali-orm.xml</ruleset> <ruleset>rulesets/java/ali-other.xml</ruleset> <ruleset>rulesets/java/ali-set.xml</ruleset> </rulesets> <printFailingErrors>true</printFailingErrors> <excludes> <exclude>**/consistency/entity/*.java</exclude> <exclude>**/istio/model/mcp/*.java</exclude> <exclude>**/istio/model/naming/*.java</exclude> <exclude>**/istio/model/*.java</exclude> <exclude>**/api/grpc/auto/*.java</exclude> <exclude>**/istio/mcp/**</exclude> <exclude>**/istio/networking/**</exclude> <exclude>**/google/protobuf/**</exclude> </excludes> </configuration> <executions> <execution> <goals> <goal>check</goal> </goals> </execution> </executions> <dependencies> <dependency> <groupId>com.alibaba.p3c</groupId> <artifactId>p3c-pmd</artifactId> <version>${p3c-pmd.version}</version> </dependency> </dependencies> </plugin> <plugin> <groupId>org.apache.maven.plugins</groupId> <artifactId>maven-checkstyle-plugin</artifactId> <version>${maven-checkstyle-plugin.version}</version> <configuration> <configLocation>style/NacosCheckStyle.xml</configLocation> <includeTestSourceDirectory>true</includeTestSourceDirectory> <encoding>UTF-8</encoding> <consoleOutput>true</consoleOutput> <failsOnError>true</failsOnError> <excludes>**/consistency/entity/**,**/nacos/test/**,**/api/grpc/auto/**,**/istio/**,**/protobuf/**</excludes> </configuration> <executions> <execution> <id>validate</id> <phase>validate</phase> <goals> <goal>check</goal> </goals> </execution> </executions> </plugin> <plugin> <groupId>org.apache.rat</groupId> <artifactId>apache-rat-plugin</artifactId> <version>${apache-rat-plugin.version}</version> <configuration> <excludes> <exclude>.editorconfig</exclude> <exclude>.travis.yml</exclude> <exclude>CONTRIBUTING.md</exclude> <exclude>CODE_OF_CONDUCT.md</exclude> <exclude>CHANGELOG.md</exclude> <exclude>style/codeStyle.md</exclude> <exclude>REPORTING-BUGS.md</exclude> <exclude>README.md</exclude> <exclude>.github/**/*</exclude> <exclude>doc/*</exclude> 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<artifactId>jacoco-maven-plugin</artifactId> <version>${jacoco-maven-plugin.version}</version> <executions> <execution> <id>default-prepare-agent</id> <goals> <goal>prepare-agent</goal> </goals> <configuration> <destFile>${project.build.directory}/jacoco.exec</destFile> </configuration> </execution> <execution> <id>default-prepare-agent-integration</id> <phase>pre-integration-test</phase> <goals> <goal>prepare-agent-integration</goal> </goals> <configuration> <destFile>${project.build.directory}/jacoco-it.exec</destFile> <propertyName>failsafeArgLine</propertyName> </configuration> </execution> <execution> <id>default-report</id> <goals> <goal>report</goal> </goals> </execution> <execution> <id>default-report-integration</id> <goals> <goal>report-integration</goal> </goals> </execution> </executions> </plugin> <plugin> <artifactId>maven-surefire-plugin</artifactId> <version>${maven-surefire-plugin.version}</version> </plugin> <plugin> <groupId>org.codehaus.mojo</groupId> 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</plugin> </plugins> </build> <profiles> <profile> <id>jdk8</id> <activation> <jdk>[1.8,)</jdk> </activation> <!-- Disable doclint under JDK 8 --> <reporting> <plugins> <plugin> <artifactId>maven-javadoc-plugin</artifactId> <version>${maven-javadoc-plugin.version}</version> <configuration> <additionalparam>-Xdoclint:none</additionalparam> </configuration> </plugin> </plugins> </reporting> <build> <plugins> <plugin> <artifactId>maven-javadoc-plugin</artifactId> <version>${maven-javadoc-plugin.version}</version> <configuration> <additionalparam>-Xdoclint:none</additionalparam> </configuration> </plugin> </plugins> </build> </profile> <profile> <id>release-sign-artifacts</id> <activation> <property> <name>performRelease</name> <value>true</value> </property> </activation> <properties> <maven.javadoc.skip>false</maven.javadoc.skip> </properties> <build> <plugins> <plugin> <artifactId>maven-gpg-plugin</artifactId> <version>${maven-gpg-plugin.version}</version> <executions> <execution> <id>sign-artifacts</id> <phase>verify</phase> <goals> <goal>sign</goal> </goals> </execution> </executions> </plugin> </plugins> </build> </profile> <profile> <!-- Run integration tests for configuration modules separately --> <id>cit-test</id> <build> <plugins> <plugin> <groupId>org.apache.maven.plugins</groupId> <artifactId>maven-surefire-plugin</artifactId> <version>${maven-surefire-plugin.version}</version> <configuration> <testFailureIgnore>false</testFailureIgnore> <includes> <include>**/*CITCase.java</include> </includes> </configuration> </plugin> </plugins> </build> </profile> <profile> <!-- Run integration tests for all modules separately --> <id>nit-test</id> <build> <plugins> <plugin> <groupId>org.apache.maven.plugins</groupId> <artifactId>maven-surefire-plugin</artifactId> <version>${maven-surefire-plugin.version}</version> <configuration> <testFailureIgnore>false</testFailureIgnore> <includes> <include>**/naming/*ITCase.java</include> </includes> </configuration> </plugin> </plugins> </build> </profile> <profile> <id>sonar-apache</id> <properties> <!-- URL of the ASF SonarQube server --> <sonar.host.url>https://builds.apache.org/analysis</sonar.host.url> </properties> </profile> <profile> <id>remove-test-data</id> <build> <plugins> <plugin> <groupId>org.apache.maven.plugins</groupId> <artifactId>maven-clean-plugin</artifactId> <configuration> <followSymLinks>false</followSymLinks> <filesets> <fileset> <directory>${user.home}/nacos/data</directory> </fileset> </filesets> </configuration> </plugin> </plugins> </build> </profile> </profiles> <reporting> <plugins> <plugin> <groupId>org.codehaus.mojo</groupId> <artifactId>findbugs-maven-plugin</artifactId> <version>${findbugs-maven-plugin.version}</version> </plugin> </plugins> </reporting> <!-- Submodule management --> <modules> <module>config</module> <module>core</module> <module>naming</module> <module>address</module> <module>test</module> <module>api</module> <module>client</module> <module>example</module> <module>common</module> <module>distribution</module> <module>console</module> <module>cmdb</module> <module>istio</module> <module>consistency</module> <module>auth</module> <module>sys</module> </modules> <!-- Default dependencies in all subprojects --> <dependencies> <dependency> <groupId>junit</groupId> <artifactId>junit</artifactId> <scope>test</scope> </dependency> <dependency> <groupId>org.mockito</groupId> <artifactId>mockito-core</artifactId> <scope>test</scope> </dependency> <dependency> <groupId>org.mockito</groupId> <artifactId>mockito-inline</artifactId> <scope>test</scope> </dependency> </dependencies> <!-- Manage the version numbers of dependencies, sub-modules will not introduce these dependencies by default --> <dependencyManagement> <dependencies> <dependency> <!-- Import dependency management from Spring Boot --> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-dependencies</artifactId> <version>${spring-boot-dependencies.version}</version> <type>pom</type> <scope>import</scope> </dependency> <!-- Internal libs --> <dependency> <groupId>${project.groupId}</groupId> <artifactId>nacos-config</artifactId> <version>${project.version}</version> </dependency> <dependency> <groupId>${project.groupId}</groupId> <artifactId>nacos-core</artifactId> <version>${project.version}</version> </dependency> <dependency> <groupId>${project.groupId}</groupId> <artifactId>nacos-naming</artifactId> <version>${project.version}</version> </dependency> <dependency> <groupId>${project.groupId}</groupId> <artifactId>nacos-api</artifactId> <version>${project.version}</version> </dependency> <dependency> <groupId>${project.groupId}</groupId> <artifactId>nacos-client</artifactId> <version>${project.version}</version> </dependency> <dependency> <groupId>${project.groupId}</groupId> <artifactId>nacos-test</artifactId> <version>${project.version}</version> </dependency> <dependency> <groupId>${project.groupId}</groupId> <artifactId>nacos-common</artifactId> <version>${project.version}</version> </dependency> <dependency> <groupId>${project.groupId}</groupId> <artifactId>nacos-cmdb</artifactId> <version>${project.version}</version> </dependency> <dependency> <groupId>${project.groupId}</groupId> <artifactId>nacos-console</artifactId> <version>${project.version}</version> </dependency> <dependency> <groupId>${project.groupId}</groupId> <artifactId>nacos-distribution</artifactId> <version>${project.version}</version> </dependency> <dependency> <groupId>${project.groupId}</groupId> <artifactId>nacos-example</artifactId> <version>${project.version}</version> </dependency> <dependency> <groupId>${project.groupId}</groupId> <artifactId>nacos-address</artifactId> <version>${project.version}</version> </dependency> <dependency> <groupId>${project.groupId}</groupId> <artifactId>nacos-istio</artifactId> <version>${project.version}</version> </dependency> <dependency> <groupId>${project.groupId}</groupId> <artifactId>nacos-consistency</artifactId> <version>${project.version}</version> </dependency> <dependency> <groupId>${project.groupId}</groupId> <artifactId>nacos-auth</artifactId> <version>${project.version}</version> </dependency> <dependency> <groupId>${project.groupId}</groupId> <artifactId>nacos-sys</artifactId> <version>${project.version}</version> </dependency> <dependency> <groupId>javax.servlet</groupId> <artifactId>servlet-api</artifactId> <version>${servlet-api.version}</version> <scope>provided</scope> </dependency> <!-- HikariCP --> <dependency> <groupId>com.zaxxer</groupId> <artifactId>HikariCP</artifactId> <version>${HikariCP.version}</version> </dependency> <!-- hessian --> <dependency> <groupId>com.caucho</groupId> <artifactId>hessian</artifactId> <version>${hessian.version}</version> </dependency> <!-- Apache commons --> <dependency> <groupId>commons-io</groupId> <artifactId>commons-io</artifactId> <version>${commons-io.version}</version> </dependency> <dependency> <groupId>commons-collections</groupId> <artifactId>commons-collections</artifactId> <version>${commons-collections.version}</version> </dependency> <dependency> <groupId>commons-logging</groupId> <artifactId>commons-logging</artifactId> <version>${commons-logging.version}</version> </dependency> <dependency> <groupId>commons-dbcp</groupId> <artifactId>commons-dbcp</artifactId> <version>${commons-dbcp.version}</version> </dependency> <dependency> <groupId>commons-cli</groupId> <artifactId>commons-cli</artifactId> <version>${commons-cli.version}</version> </dependency> <!-- Logging libs --> <dependency> <groupId>org.slf4j</groupId> <artifactId>slf4j-api</artifactId> <version>${slf4j-api.version}</version> </dependency> <dependency> <groupId>ch.qos.logback</groupId> <artifactId>logback-classic</artifactId> <version>${logback.version}</version> </dependency> <dependency> <groupId>ch.qos.logback</groupId> <artifactId>logback-core</artifactId> <version>${logback.version}</version> </dependency> <dependency> <groupId>org.apache.logging.log4j</groupId> <artifactId>log4j-core</artifactId> <version>${log4j.version}</version> </dependency> <dependency> <groupId>org.apache.logging.log4j</groupId> <artifactId>log4j-api</artifactId> <version>${log4j.version}</version> </dependency> <dependency> <groupId>org.apache.logging.log4j</groupId> <artifactId>log4j-slf4j-impl</artifactId> <version>${log4j.version}</version> </dependency> <!-- HTTP client libs --> <dependency> <groupId>org.apache.httpcomponents</groupId> <artifactId>httpasyncclient</artifactId> <version>${httpasyncclient.version}</version> </dependency> <!-- JDBC libs --> <dependency> <groupId>mysql</groupId> <artifactId>mysql-connector-java</artifactId> <version>${mysql-connector-java.version}</version> </dependency> <dependency> <groupId>org.apache.derby</groupId> <artifactId>derby</artifactId> <version>${derby.version}</version> </dependency> <!-- JRaft --> <dependency> <groupId>com.alipay.sofa</groupId> <artifactId>jraft-core</artifactId> <version>${jraft-core.version}</version> <exclusions> <exclusion> <groupId>com.alipay.sofa</groupId> <artifactId>bolt</artifactId> </exclusion> <exclusion> <groupId>org.apache.logging.log4j</groupId> <artifactId>log4j-api</artifactId> </exclusion> <exclusion> <groupId>org.apache.logging.log4j</groupId> <artifactId>log4j-core</artifactId> </exclusion> <exclusion> <groupId>org.apache.logging.log4j</groupId> <artifactId>log4j-slf4j-impl</artifactId> </exclusion> <exclusion> <groupId>org.apache.logging.log4j</groupId> <artifactId>log4j-jcl</artifactId> </exclusion> </exclusions> </dependency> <dependency> <groupId>com.alipay.sofa</groupId> <artifactId>rpc-grpc-impl</artifactId> <version>${rpc-grpc-impl.version}</version> </dependency> <!-- Third-party libs --> <dependency> <groupId>cglib</groupId> <artifactId>cglib-nodep</artifactId> <version>${cglib-nodep.version}</version> </dependency> <dependency> <groupId>net.jcip</groupId> <artifactId>jcip-annotations</artifactId> <version>${jcip-annotations.version}</version> </dependency> <dependency> <groupId>com.fasterxml.jackson.core</groupId> <artifactId>jackson-core</artifactId> <version>${jackson-core.version}</version> </dependency> <dependency> <groupId>com.fasterxml.jackson.core</groupId> <artifactId>jackson-databind</artifactId> <version>${jackson-databind.version}</version> </dependency> <dependency> <groupId>com.fasterxml.jackson.core</groupId> <artifactId>jackson-annotations</artifactId> <version>${jackson.annotations.version}</version> </dependency> <dependency> <groupId>org.codehaus.jackson</groupId> <artifactId>jackson-core-asl</artifactId> <version>${jackson-core-asl.version}</version> </dependency> <dependency> <groupId>io.jsonwebtoken</groupId> <artifactId>jjwt-api</artifactId> <version>${jjwt.version}</version> </dependency> <dependency> <groupId>io.jsonwebtoken</groupId> <artifactId>jjwt-impl</artifactId> <version>${jjwt.version}</version> <scope>runtime</scope> </dependency> <dependency> <groupId>io.jsonwebtoken</groupId> <artifactId>jjwt-jackson</artifactId> <version>${jjwt.version}</version> <scope>runtime</scope> </dependency> <dependency> <groupId>io.netty</groupId> <artifactId>netty-all</artifactId> <version>${netty-all.version}</version> </dependency> <dependency> <groupId>javax.annotation</groupId> <artifactId>javax.annotation-api</artifactId> <version>1.3.2</version> </dependency> <dependency> <groupId>org.apache.mina</groupId> <artifactId>mina-core</artifactId> <version>${mina-core.version}</version> </dependency> <dependency> <groupId>com.google.guava</groupId> <artifactId>guava</artifactId> <version>${guava.version}</version> </dependency> <dependency> <groupId>org.javatuples</groupId> <artifactId>javatuples</artifactId> <version>${javatuples.version}</version> </dependency> <dependency> <groupId>com.github.keran213539</groupId> <artifactId>commonOkHttp</artifactId> <version>${commonOkHttp.version}</version> <scope>test</scope> </dependency> <!-- gRPC dependency start --> <dependency> <groupId>io.grpc</groupId> <artifactId>grpc-netty-shaded</artifactId> <version>${grpc-java.version}</version> </dependency> <dependency> <groupId>io.grpc</groupId> <artifactId>grpc-protobuf</artifactId> <version>${grpc-java.version}</version> </dependency> <dependency> <groupId>io.grpc</groupId> <artifactId>grpc-stub</artifactId> <version>${grpc-java.version}</version> </dependency> <dependency> <groupId>io.grpc</groupId> <artifactId>protoc-gen-grpc-java</artifactId> <version>${grpc-java.version}</version> <type>pom</type> </dependency> <dependency> <groupId>io.grpc</groupId> <artifactId>grpc-testing</artifactId> <version>${grpc-java.version}</version> <scope>test</scope> </dependency> <dependency> <groupId>com.google.api.grpc</groupId> <artifactId>proto-google-common-protos</artifactId> <version>${proto-google-common-protos.version}</version> </dependency> <!-- gRPC dependency end --> <dependency> <groupId>com.google.protobuf</groupId> <artifactId>protobuf-java</artifactId> <version>${protobuf-java.version}</version> </dependency> <dependency> <groupId>org.reflections</groupId> <artifactId>reflections</artifactId> <version>${reflections.version}</version> </dependency> <dependency> <groupId>org.mockito</groupId> <artifactId>mockito-all</artifactId> <version>${mockito-all.version}</version> </dependency> <dependency> <groupId>org.mockito</groupId> <artifactId>mockito-core</artifactId> <version>${mockito-core.version}</version> </dependency> <dependency> <groupId>org.mockito</groupId> <artifactId>mockito-inline</artifactId> <version>${mockito-core.version}</version> </dependency> <dependency> <groupId>org.hamcrest</groupId> <artifactId>hamcrest-all</artifactId> <version>${hamcrest-all.version}</version> </dependency> <dependency> <groupId>io.prometheus</groupId> <artifactId>simpleclient</artifactId> <version>${prometheus-simpleclient.version}</version> </dependency> <dependency> <groupId>org.apache.tomcat.embed</groupId> <artifactId>tomcat-embed-jasper</artifactId> <version>${tomcat-embed-jasper.version}</version> </dependency> <dependency> <groupId>com.google.truth</groupId> <artifactId>truth</artifactId> <version>${truth.version}</version> </dependency> </dependencies> </dependencyManagement> <distributionManagement> <snapshotRepository> <!-- The ID here must be exactly the same as the value of the server element id in the settings.xml file of MAVEN --> <id>sona</id> <url>https://oss.sonatype.org/content/repositories/snapshots/</url> </snapshotRepository> <repository> <id>sona</id> <url>https://oss.sonatype.org/service/local/staging/deploy/maven2/</url> </repository> </distributionManagement> </project>
根POM的完整信息如上 。
在 nacos-naming 中继承 nacos-all工程，引入 nacos-core，无需指定版本，将会自动读取父模块中 dependencyManagement 中所指定的版本。当然你也可以选择指定版本，则将会进行覆盖，但并不建议这么操作，将提高项目维护难度。
如上，我们就通过 dependencyManagement 我们即实现了项目依赖版本的统一管理。
依赖导入
上面介绍了如何通过 dependencyManagement 实现全局的依赖版本管理，但如果工程中的两个子模块都需要配置相同的 dependencyManagement 配置时，可以选择通过继承父模块来实现
举个例子：
maven-demo 创建同级模块 maven-demo1 ，如果要实现 maven-demo 中配置的 dependencyManagement 则在其 dependencyManagement 配置中导入 maven-demo 并将 scope 设置为 import，并将 type 设置为 pom。
通过导入即可实现更轻量化的模块信息继承，具体配置内容如下：
<dependencyManagement> <dependencies> <dependency> <groupId>com.artisan</groupId> <artifactId>maven-demo</artifactId> <version>1.0.0-SNAPSHOT</version> <!-- 导入目标模块的 dependencyManagement --> <!-- 依赖范围为 import --> <scope>import</scope> <!-- 类型一般为 pom --> <type>pom</type> </dependency> </dependencies> </dependencyManagement>
