Assembly plugin generating 2 jars. One with classfiles. One with dependencies - maven

Question

I am having trouble building a jar using the assembly plugin. I have a bunch of system jar files that I want bundled alongside class files of the project.
I was looking to do something like:
final
- lib
- system.jar
- system1.jar
- com
- servlet
-- etc
I have tried to use the assembly plugin but it generates 2 jars. One with just the lib with my jars and another with the class files.
I have read through the assembly docs but I must be missing something.
Here is the build element I have in my pom.xml
<dependency>
<groupId>jackson-mapper-asl</groupId>
<artifactId>jackson-mapper-asl</artifactId>
<version>1.9.4</version>
<scope>system</scope>
<systemPath>${project.basedir}/lib/jackson-mapper-asl-1.9.4-sc1.jar</systemPath>
</dependency>
//... etc
<build>
<plugins>
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-assembly-plugin</artifactId>
<version>2.4</version>
<executions>
<execution>
<id>final-jar</id>
<phase>package</phase>
<goals>
<goal>single</goal>
</goals>
<configuration>
<descriptors>
<descriptor>assembly.xml</descriptor>
</descriptors>
</configuration>
</execution>
</executions>
</plugin>
</plugins>
</build>
This is my assembly file (assembly.xml)
<assembly>
<id>distribution</id>
<formats>
<format>jar</format>
</formats>
<includeBaseDirectory>false</includeBaseDirectory>
<dependencySets>
<dependencySet>
<useProjectArtifact>false</useProjectArtifact>
<useTransitiveDependencies>true</useTransitiveDependencies>
<unpack>false</unpack>
<scope>system</scope>
<outputDirectory>lib</outputDirectory>
<includes />
</dependencySet>
</dependencySets>
</assembly>
Any idea how I can merge these jars together?

Answer 1

You would usually have a much simpler layout, such as:
final
- lib
-system.jar
-system1.jar
-project.jar
I.e. the project itself is a jar too, and included in the lib. In this case just add <useProjectArtifact>true/>useProjectArtifact> to the dependencySet.
If you really, really want to have classes copied in directly, try adding a fileset to the assembly, copying from target/classes into your root location
<fileSets>
<fileSet>
<directory>${project.build.directory}</directory>
<outputDirectory>/</outputDirectory>
</fileSet>
</fileSets>