Cannot include project artifact: com.test.mmm.jar:1.0; it doesn't have an associated file or directory - maven

Question

I'm pretty lost with maven and I can't seem to find a solution for my problem. When I try to generate the jar file with all the dependencies of my project to execute it on another computer I find this warning when I execute sudo mvn clean compile assembly:single:
[WARNING] Cannot include project artifact: com.test:mmm:jar:1.0; it doesn't have an associated file or directory.
Also, when I try to execute the .jar with java -jar target/test.jar this error appears:
Error: Unable to access jarfile target/test.jar
here's my pom.xml:
<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
<modelVersion>4.0.0</modelVersion>
<groupId>com.test</groupId>
<artifactId>mmm</artifactId>
<version>1.0</version>
<packaging>jar</packaging>
<name>mmm</name>
<url>http://maven.apache.org</url>
<properties>
<nd4j.backend>nd4j-cuda-8.0-platform</nd4j.backend>
</properties>
<dependencies>
<dependency>
<groupId>org.jblas</groupId>
<artifactId>jblas</artifactId>
<version>1.2.4</version>
</dependency>
<dependency>
<groupId>org.nd4j</groupId>
<artifactId>nd4j-native-platform</artifactId>
<version>0.8.0</version>
</dependency>
<dependency>
<groupId>junit</groupId>
<artifactId>junit</artifactId>
<version>4.8.2</version>
<scope>test</scope>
</dependency>
<dependency>
<groupId>org.deeplearning4j</groupId>
<artifactId>deeplearning4j-core</artifactId>
<version>0.8.0</version>
</dependency>
</dependencies>
<build>
<plugins>
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-assembly-plugin</artifactId>
<version>3.0.0</version>
<configuration>
<archive>
<manifest>
<mainClass>com.test.mmm.Main</mainClass>
</manifest>
</archive>
<finalName>test</finalName>
<descriptorRefs>jar-with-dependencies</descriptorRefs>
</configuration>
</plugin>
</plugins>
</build>
The main class is located in src/
I've tried many solutions from stack overflow but had no success, can someone help me?
Thank you!

Answer 1

Use mvn package first to build your module classes then assembly:single.
mvn package assembly:single

Answer 2

From the warning you've included in your question:
[WARNING] Cannot include project artifact: Amjar:amjar:pom:0.2; it doesn't have an associated.
I'd guess that you've got the packaging in your pom.xml set to pom.
This is fine if your module is simply packaging a set of dependencies or resource files, however, if you also want Maven to create a jar containing the classes in you module you will need to set the packaging to jar.

Answer 3

make sure that your atrifact produced is matching with <finalName>
i.e.
<groupId>com.rocket</groupId>
<artifactId>myapp</artifactId>
<version>1.0</version>
<packaging>jar</packaging>
<name>myapp</name>
produces myapp-1.0.jar
and provide same here
<finalName>myapp-1.0</finalName>
and run then execute:
mvn package assembly:single