Square's maven config for embedding rubygems into the final shaded jar.

pom.xml

  <repositories>
    <repository>
      <id>rubygems-release</id>
      <url>http://rubygems-proxy.torquebox.org/releases</url>
    </repository>
  </repositories>

  <build>
    <plugins>
      <plugin>
        <groupId>de.saumya.mojo</groupId>
        <artifactId>gem-maven-plugin</artifactId>
        <version>1.0.0-beta</version>
        <executions>
          <execution>
            <goals>
              <goal>initialize</goal>
            </goals>
          </execution>
        </executions>
      </plugin>

      <plugin>
        <groupId>org.codehaus.mojo</groupId>
        <artifactId>build-helper-maven-plugin</artifactId>
        <version>1.7</version>
        <executions>
          <execution>
            <id>add-resource</id>
            <phase>generate-sources</phase>
            <goals>
              <goal>add-resource</goal>
            </goals>
            <configuration>
              <resources>
                <resource>
                  <directory>${project.build.directory}/rubygems</directory>
                  <targetPath>rubygems</targetPath>
                </resource>
              </resources>
            </configuration>
          </execution>
        </executions>
      </plugin>

      <plugin>
        <groupId>org.apache.maven.plugins</groupId>
        <artifactId>maven-shade-plugin</artifactId>
      </plugin>
    </plugins>

    <pluginManagement>
      <plugins>
        <plugin>
          <groupId>org.apache.maven.plugins</groupId>
          <artifactId>maven-shade-plugin</artifactId>
          <version>1.4</version>
          <executions>
            <execution>
              <phase>package</phase>
              <goals>
                <goal>shade</goal>
              </goals>
              <configuration>
                <shadedArtifactAttached>true</shadedArtifactAttached>
                <shadedClassifierName>shaded</shadedClassifierName>
                <artifactSet>
                  <excludes>
                    <exclude>*:*:gem:*</exclude>
                  </excludes>
                </artifactSet>
                <!-- signatures from foreign jars are bad news -->
                <filters>
                  <filter>
                    <artifact>*:*</artifact>
                    <excludes>
                      <exclude>META-INF/*.SF</exclude>
                      <exclude>META-INF/*.DSA</exclude>
                      <exclude>META-INF/*.RSA</exclude>
                      <!-- We get a LICENSE and a META-INF/license folder.
                        This make the jar error on decompression because directories
                        on standard mac are not case sensitive -->
                      <exclude>META-INF/LICENSE</exclude>
                    </excludes>
                  </filter>
                </filters>
                <transformers>
                  <transformer
                      implementation="org.apache.maven.plugins.shade.resource.ServicesResourceTransformer"/>
                  <transformer
                      implementation="org.apache.maven.plugins.shade.resource.ManifestResourceTransformer">
                    <manifestEntries>
                      <Main-Class>${project.mainclass}</Main-Class>
                      <Implementation-Build>${buildNumber}</Implementation-Build>
                    </manifestEntries>
                  </transformer>
                </transformers>
              </configuration>
            </execution>
          </executions>
        </plugin>
      </plugins>
    </pluginManagement>
  </build>
  
  <dependencies>
    <!-- GEMS -->
    <dependency>
      <groupId>rubygems</groupId>
      <artifactId>bundler</artifactId>
      <version>1.3.4</version>
      <type>gem</type>
    </dependency>
    <!-- Regular Dependencies -->
    <dependency>
      <groupId>com.squareup</groupId>
      <artifactId>webservice</artifactId>
      <version>HEAD-SNAPSHOT</version>
    </dependency>
  </dependencies>