Package and generate source.jar

<build>  
        <plugins>  
            <plugin>  
                <artifactId>maven-source-plugin</artifactId>  
                <version>2.1</version>  
                <configuration>  
                    <attach>true</attach>  
                </configuration>  
                <executions>  
                    <execution>  
                        <phase>compile</phase>  
                        <goals>  
                            <goal>jar</goal>  
                        </goals>  
                    </execution>  
                </executions>  
            </plugin>  
        </plugins>  
    </build>