uber jar - assembly plugin

pom.xml

<plugin>
    <artifactId>maven-assembly-plugin</artifactId>
    <version>2.5.3</version>
    <configuration>
        <descriptor>/assembly.xml</descriptor>
    </configuration>
    <executions>
        <execution>
            <id>create-archive</id>
            <phase>package</phase>
            <goals>
                <goal>single</goal>
            </goals>
        </execution>
    </executions>
</plugin>