maven shade plugin

pom.xml

<!-- Maven Shade Plugin -->
<plugin>
  <groupId>org.apache.maven.plugins</groupId>
  <artifactId>maven-shade-plugin</artifactId>
  <version>2.3</version>
  <executions>
    <execution>
        <phase>package</phase>
        <goals>
            <goal>shade</goal>
        </goals>
        <configuration>
          <transformers>
            <!-- add Main-Class to manifest file -->
            <transformer implementation="org.apache.maven.plugins.shade.resource.ManifestResourceTransformer">
                <mainClass>${main.class}</mainClass>
            </transformer>
          </transformers>
        </configuration>
      </execution>
  </executions>
</plugin>