如何在最终jar中仅包含一个依赖项项目类

Question

I use Maven to build my MyProject . There are several other projects which are used as library projects for ' MyProject '.

In pom.xml of MyProject , I defined those library projects as dependencies of MyProject . One of the Library project is named " OneLibProject ":

<dependency>
    <groupId>com.xxx.OneLibProject</groupId>
    <artifactId>OneLibProject</artifactId>
    <version>1.0.0-SNAPSHOT</version>
    <type>jar</type>
</dependency>
<dependency>
  ...
</dependency>

Under MyProject root path, after I run : maven clean install a MyProject.jar is generated. But those classes defined in library projects(dependencies) are not included in this MyProject.jar .

Each library project also have its own pom & can generate its own jar.

Now, what I want to do is I want to have my pom.xml in " MyProject " to be configured so that the generated MyProject.jar file contains the classes of OneLibProject and classes of MyProject . Other library project classes are not included .

How to achieve this?

Answer 1

You can use maven-assembly-plugin and configure which dependencies to include in jar in assembly descriptor's dependencySet section.

Assuming you have project y and z. Add this plugin to y's pom

        <plugin>
            <artifactId>maven-assembly-plugin</artifactId>
            <version>2.4</version>
            <configuration>
                <descriptor>src/main/assembly/assembly.xml</descriptor>
            </configuration>
        </plugin>

place this assembly.xml in scr/main/assembly

<assembly
    xmlns="http://maven.apache.org/plugins/maven-assembly-plugin/assembly/1.1.0"
    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
    xsi:schemaLocation="http://maven.apache.org/plugins/maven-assembly-plugin/assembly/1.1.0 http://maven.apache.org/xsd/assembly-1.1.0.xsd">
    <id>jar-with-dependencies</id>
    <formats>
        <format>jar</format>
    </formats>
    <includeBaseDirectory>false</includeBaseDirectory>
    <dependencySets>
        <dependencySet>
            <outputDirectory>/</outputDirectory>
            <useProjectArtifact>true</useProjectArtifact>
            <unpack>true</unpack>
            <scope>runtime</scope>
            <includes>
                <include>test:y</include>
                <include>test:z</include>
            </includes>
        </dependencySet>
    </dependencySets>
</assembly>

run mvn install in z

run mvn package assembly:assembly in y

if all correct you will get y-0.0.1-SNAPSHOT-jar-with-dependencies.jar in target folder. It will contain y and x classes only.