Unable to generate Kubernetes manifests yaml files using JKube maven plugin

Question

I'm trying to generate my Kubernetes manifests (deployment.yml and service.yml) using JKube via this command : mvn k8s:resource

But I'm getting this error :

[INFO] Scanning for projects...
[INFO] 
[INFO] -------------------< io.social.carpooling:trips-api >-------------------
[INFO] Building trips-api 0.0.1-SNAPSHOT
[INFO] --------------------------------[ jar ]---------------------------------
[INFO] 
[INFO] --- kubernetes-maven-plugin:1.1.1:resource (default-cli) @ trips-api ---
[INFO] ------------------------------------------------------------------------
[INFO] BUILD FAILURE
[INFO] ------------------------------------------------------------------------
[INFO] Total time: 4.979 s
[INFO] Finished at: 2021-03-18T19:11:24+01:00
[INFO] ------------------------------------------------------------------------
[ERROR] Failed to execute goal org.eclipse.jkube:kubernetes-maven-plugin:1.1.1:resource (default-cli) on project trips-api: Execution default-cli of goal org.eclipse.jkube:kubernetes-maven-plugin:1.1.1:resource failed.: NullPointerException -> [Help 1]
[ERROR] 
[ERROR] To see the full stack trace of the errors, re-run Maven with the -e switch.
[ERROR] Re-run Maven using the -X switch to enable full debug logging.
[ERROR] 
[ERROR] For more information about the errors and possible solutions, please read the following articles:
[ERROR] [Help 1] http://cwiki.apache.org/confluence/display/MAVEN/PluginExecutionException

Here is what my pom.xml looks like :

<properties>
        ...
        <jkube.version>1.1.1</jkube.version>
        <jkube.generator.name>my-dockerhub-username/${project.artifactId}:${project.version}</jkube.generator.name>
        ...
</properties>
...
<plugin>
            <groupId>org.eclipse.jkube</groupId>
            <artifactId>kubernetes-maven-plugin</artifactId>
            <version>${jkube.version}</version>
            <configuration>
                <images>
                    <image>
                        <name>my-dockerhub-username/${project.artifactId}:${project.version}</name>
                    </image>
                </images>
            </configuration>
 </plugin>

I tried to get more details using the plugin documentation but I didn't found so much. Is there anyone who successfully generated the yaml files and deployed to Kubernetes cluster.

Answer 1

Update:

Apparently this was a bug in Eclipse JKube(eclipse/jkube#624) that wasn't allowing users to configure image name using provided properties in simple Dockerfile mode. This has been fixed in new release v1.2.0.

Now you should be able to configure image name using jkube.generator.name. You don't need to provide XML configuration in order to override default image name. Earlier you're providing XML configuration without any <build> configuration which was causing this NPE. As per Kuberntes Maven Plugin Documentation this field is mandatory when providing image XML configuration. configuration

We're going to fix this NPE(eclipse/jkube#618) in upcoming releases too so that users can be informed when they don't provide a image build