需求

如果要把本地的jar包添加到Maven项目，之前一直可以使用下面的依赖，但是高版本的maven却报了warning。Maven是想尽一切办法让你使用本地仓库，所以这种方法已经不推荐了，可以使用mvn install:install-file命令安装jar包到本地仓库。

<dependency>
    <groupId>net.paoding.analysis</groupId>
    <artifactId>paoding-analysis</artifactId>
    <version>2.0.4</version>
    <scope>system</scope>
    <systemPath>${project.basedir}/lib/paoding-analysis.jar</systemPath>
</dependency>

warning信息：

[WARNING] 'dependencies.dependency.systemPath' for net.paoding.analysis:paoding-analysis:jar should not point at files within the project directory, ${project.basedir}/lib/paoding-analysis.jar will be unresolvable by dependent projects @ line 71, column 25
[WARNING] 
[WARNING] It is highly recommended to fix these problems because they threaten the stability of your build.
[WARNING] 
[WARNING] For this reason, future Maven versions might no longer support building such malformed projects.

安装Jar包到本地Maven仓库

Install the JAR into your local Maven repository as follows:

mvn install:install-file
   -Dfile=<path-to-file>
   -DgroupId=<group-id>
   -DartifactId=<artifact-id>
   -Dversion=<version>
   -Dpackaging=<packaging>
   -DgeneratePom=true

Where: <path-to-file>  the path to the file to load
   <group-id>      the group that the file should be registered under
   <artifact-id>   the artifact name for the file
   <version>       the version of the file
   <packaging>     the packaging of the file e.g. jar

示例

例如：如果要把paoding-analysis.jar安装到mvn，需要执行以下命令：

mvn install:install-file -Dfile=./lib/paoding-analysis.jar -DgroupId=net.paoding -DartifactId=paoding-analysis -Dversion=2.0.4 -Dpackaging=jar

查看日志，mvn会把jar包安装到这个目录/Users/lyh/.m2/repository/net/paoding/paoding-analysis/2.0.4/
其实，如果熟悉maven的目录结构，可以直接把jar包复制到响应的目录下，不用执行上述命令，效果一样。

[INFO] --- maven-install-plugin:2.4:install-file (default-cli) @ bigdata-mr ---
[INFO] Installing /Users/lyh/dev/src/hadoop/MapReduce/lib/paoding-analysis.jar to /Users/lyh/.m2/repository/net/paoding/paoding-analysis/2.0.4/paoding-analysis-2.0.4.jar
[INFO] Installing /var/folders/91/_fj2gxc54t1g796srzhmc1r80000gn/T/mvninstall505131428054290220.pom to /Users/lyh/.m2/repository/net/paoding/paoding-analysis/2.0.4/paoding-analysis-2.0.4.pom

之后在本地系统，如果需要使用paoding-analysis.jar，pom.xml加入下面依赖，然后就可以像使用其它包一样使用这个包了。

<dependency>
    <groupId>net.paoding</groupId>
    <artifactId>paoding-analysis</artifactId>
    <version>2.0.4</version>
</dependency>

参考

Guide to installing 3rd party JARs
I have a jar that I want to put into my local repository. How can I copy it in?