Docker image not getting image name from pom.xml - spring-boot

Question

I am creating the docker image using spotify. My docker image is creating successfully but w/o a name. I am getting below on console:
Image will be built without a name
POM.XML
<parent>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-parent</artifactId>
<version>2.0.8.RELEASE</version>
<relativePath/> <!-- lookup parent from repository -->
</parent>
<groupId>com.nv</groupId>
<artifactId>microeurekaserver</artifactId>
<version>0.0.1-SNAPSHOT</version>
<name>MicroEurekaServer</name>
<description>Eureka Server</description>
<properties>
<java.version>1.8</java.version>
<spring-cloud.version>Finchley.SR2</spring-cloud.version>
<docker.image.prefix>nvarshney44/nvarshney</docker.image.prefix>
</properties>
<build>
<plugins>
<plugin>
<groupId>com.spotify</groupId>
<artifactId>docker-maven-plugin</artifactId>
<version>1.0.0</version>
<configuration>
<imageName>${docker.image.prefix}/${project.artifactId}</imageName>
<forceTags>true</forceTags>
<imageTags>
<imageTag>${project.version}</imageTag>
<imageTag>latest</imageTag>
</imageTags>
<resources>
<resource>
<directory>${project.build.directory}</directory>
<include>${project.build.finalName}.jar</include>
</resource>
</resources>
<serverId>docker-hub</serverId>
<registryUrl>https://index.docker.io/v1/</registryUrl>
</configuration>
</plugin>
<plugin>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-maven-plugin</artifactId>
</plugin>
</plugins>
</build>
Please help me out whats wrong with it. In maven output it is showing dockerfile:null may be it is costing some issue.

Answer 1

In order to give a Docker image a name, you need to fill in the "repository" field:
<configuration>
<repository>your-name-here</repository> <!-- ${project.artifactId} is a good choice -->
<tag>${project.version}</tag>
</configuration>
This is actually consistent with the way Docker push works - it treats the name as the repository address.

Answer 2

Where are you defining this variables values ${docker} and ${project}?
It's gonna be something like:
<docker>
<image>
<prefix>
value
</prefix>
</image>
</docker>
Please check: Using variables in pom.xml