pom.xml

<plugin>
  			<groupId>org.apache.maven.plugins</groupId>
				<artifactId>maven-assembly-plugin</artifactId>
  				<version>2.3</version>
				<configuration>
					<archive>
					 	<addMavenDescriptor>false</addMavenDescriptor>
		            	<compress>true</compress>
						<index>true</index>
						<manifest>
							<mainClass>blubb.App</mainClass>
							<addClasspath>true</addClasspath>
							<classpathPrefix>lib/</classpathPrefix>
						</manifest>
					</archive>
					<descriptorRefs>
          				<descriptorRef>jar-with-dependencies</descriptorRef>
        			</descriptorRefs>
				</configuration>
				<executions>
					<execution>
						<id>make-assembly</id> <!-- this is used for inheritance merges -->
						<phase>package</phase> <!-- bind to the packaging phase -->
						<goals>
							<goal>single</goal>
						</goals>
					</execution>
				</executions>
			</plugin>