Maven assembly plugin attach sources of dependencies

Question

Some open source license require to distribute the original code for each dependency. I need to make the extracted sources available to my maven assembly plugin.

How to recursively get all the source-JARs for every single dependency used?

dependency:sources does only download source-dependencies to the local Maven repo, and not to a custom directory that I need to define.

Answer 1

Solution found:

                   <plugin>
                        <groupId>org.apache.maven.plugins</groupId>
                        <artifactId>maven-dependency-plugin</artifactId>
                        <version>2.9</version>
                        <executions>
                            <execution>
                                <id>get-dependency-sources</id>
                                <phase>package</phase>
                                <goals>
                                    <goal>copy-dependencies</goal>
                                </goals>
                                <configuration>
                                    <outputDirectory>${sources.directory}</outputDirectory>
                                    <classifier>sources</classifier>
                                    <prependGroupId>true</prependGroupId>
                                </configuration>
                            </execution>
                        </executions>
                    </plugin>

in combination with

               <plugin>
                    <artifactId>maven-antrun-plugin</artifactId>
                    <version>1.7</version>
                    <executions>
                        <execution>
                            <id>unpack-sources</id>
                            <phase>package</phase>
                            <goals>
                                <goal>run</goal>
                            </goals>
                            <configuration>
                                <target>
                                    <move todir="${sources.directory}">
                                          <fileset dir="${sources.directory}">
                                            <include name="**/*.jar"/>
                                        </fileset>
                                        <mapper type="glob" from="*.jar" to="*.zip"/>
                                    </move>
                                </target>

                            </configuration>
                        </execution>
                        ...

First collects all resources within ${sources.directory} and then renames the jars to zip files (which enables a "normal" user to view their contents in Windows Explorer. Alternatively you can also directly unzip the jars using the unzip ANT task.