Maven Error reading assemblies: No assembly descriptors found - plugins

Question

Following this Guide I ran the command
mvn assembly:assembly
and got the Build Failure of
Error reading assemblies: No assembly descriptors found.
I've looked at numerous questions on this, but to no avail.
From this post, I created a .xml with this inside:
<assembly xmlns="http://maven.apache.org/plugins/maven-assembly-plugin/assembly/1.1.2" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://maven.apache.org/plugins/maven-assembly-plugin/assembly/1.1.2 http://maven.apache.org/xsd/assembly-1.1.2.xsd">
<id>jar-with-dependencies</id>
<formats>
<format>jar</format>
</formats>
<dependencySets>
<dependencySet>
<scope>runtime</scope>
<unpack>true</unpack>
<unpackOptions>
<excludes>
<exclude>**/LICENSE*</exclude>
<exclude>**/README*</exclude>
</excludes>
</unpackOptions>
</dependencySet>
</dependencySets>
<fileSets>
<fileSet>
<directory>${project.build.outputDirectory}</directory>
<outputDirectory>${project.build.outputDirectory}</outputDirectory>
</fileSet>
<fileSet>
<directory>src/main/resources/META-INF/services</directory>
<outputDirectory>META-INF/services</outputDirectory>
</fileSet>
</fileSets>
</assembly>
and included this in the pom.xml:
<plugin>
<artifactId>maven-assembly-plugin</artifactId>
<version>2.2-beta-5</version>
<configuration>
<descriptors>
<descriptor>jar-with-dependencies.xml</descriptor>
</descriptors>
</configuration>
</plugin>
but still no luck.
I'm pretty new to this as you can probably tell, how can I get this running?
~~EDIT~~
In the pom.xml I changed
<descriptor>jar-with-dependencies.xml</descriptor>
To
<descriptor>src/main/assembly/jar-with-dependencies.xml</descriptor>
~~EDIT 2~~
pom.xml now contains this:
<plugin>
<artifactId>maven-assembly-plugin</artifactId>
<version>2.2-beta-5</version>
<executions>
<execution>
<id>make-assembly</id>
<phase>package</phase>
<goals>
<goal>single</goal>
</goals>
<configuration>
<descriptors>
<descriptor>src/main/assembly/jar-with-dependencies.xml</descriptor>
</descriptors>
</configuration>
</execution>
</executions>
</plugin>
~~EDIT 3~~
This pom.xml now works for me:
<plugin>
<artifactId>maven-assembly-plugin</artifactId>
<version>2.2-beta-5</version>
<configuration>
<descriptors>
<descriptor>src/main/assembly/jar-with-dependencies.xml</descriptor>
</descriptors>
</configuration>
<executions>
<execution>
<id>make-assembly</id>
<phase>package</phase>
<goals>
<goal>single</goal>
</goals>
</execution>
</executions>
</plugin>

Answer 1

For this to work, you need to create the file jar-with-dependencies.xml in src/main/assembly/ and this XML:
<descriptors>
<descriptor>src/main/assembly/jar-with-dependencies.xml</descriptor>
</descriptors>
i.e. you need to specify the path to the file and the convention is to put the files into src/main/assembly/.
To use the ones provided by Maven, you need to use the descriptorRef element instead (wrapped in a descriptorRefs).
Also don't put the descriptor inside of the execution element or mvn assembly:assembly can't find it anymore (since you specifically moved it to the mvn package target).
[EDIT] I followed the tutorial myself and there is an important point which you might have missed: You need to select the correct archetype. In my case, that was 5 but the order can change. So read the whole list and look for the string openimaj-quickstart-archetype or things will break.