创建一个用Maven构建的项目的jar？

Question

I have a maven project in which (under src/main/java) i have many packages and (but there is only one central pom.xml) Each package provides a different functionality than the other. So now i need to create a jar file of one particular package.If it was a normal java package(ie not built with maven) ,I would have simply extracted that package(using Export in eclipse and then selecting java->jar option) but i cant figure out a way to do this with maven. I also checked out Apache Maven Assembly Plugin but i couldn't figure out how to fit that plugin in my scenario. I am new at maven so kindly help me out. Thanks

Answer 1

Use Maven jar plugin:

<project>
  ...
  <build>
    <plugins>
      ...
      <plugin>
        <groupId>org.apache.maven.plugins</groupId>
        <artifactId>maven-jar-plugin</artifactId>
        <version>2.5</version>
        <configuration>
          <includes>
            <include>**/service/*</include>
          </includes>
        </configuration>
      </plugin>
      ...
    </plugins>
  </build>
  ...
</project>

Answer 2

Best in Maven is to create a multi module build for each part you would like to have a separate module which creates it's own jar. This will make it easy to separate functionality as well according tests.