Namespace as resource fragment results in NullPointerException

[rohanKanojia]

Description

We have DefaultNamespaceEnricher which seems to be taking care of creating a namespace on the fly when provided as a resource fragment. However, when I add a simple Namespace resource fragment in src/main/jkube like this:

apiVersion: v1
kind: Namespace
metadata:
  name: test-jkube

It results in NullPointerException:

[INFO] Building Eclipse JKube :: Quickstarts :: Maven :: External Resources 1.0.2
[INFO] --------------------------------[ jar ]---------------------------------
[INFO] 
[INFO] --- kubernetes-maven-plugin:1.0.2:resource (default-cli) @ external-resources ---
[INFO] k8s: Running generator spring-boot
[INFO] k8s: spring-boot: Using Docker image quay.io/jkube/jkube-java-binary-s2i:0.0.8 as base / builder                                                                                               
[INFO] k8s: Using resource templates from /home/rohaan/work/repos/eclipse-jkube-sample-with-resource-fragments/src/main/jkube
[INFO] k8s: jkube-controller: Adding a default Deployment
[INFO] k8s: jkube-healthcheck-spring-boot: Adding readiness probe on port 8080, path='/health', scheme='HTTP', with initial delay 10 seconds
[INFO] k8s: jkube-healthcheck-spring-boot: Adding liveness probe on port 8080, path='/health', scheme='HTTP', with initial delay 180 seconds
[INFO] k8s: jkube-revision-history: Adding revision history limit to 2
[INFO] ------------------------------------------------------------------------
[INFO] BUILD FAILURE
[INFO] ------------------------------------------------------------------------
[INFO] Total time:  2.901 s
[INFO] Finished at: 2020-12-03T19:29:48+05:30
[INFO] ------------------------------------------------------------------------
[ERROR] Failed to execute goal org.eclipse.jkube:kubernetes-maven-plugin:1.0.2:resource (default-cli) on project external-resources: Execution default-cli of goal org.eclipse.jkube:kubernetes-maven-plugin:1.0.2: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

Info

• Eclipse JKube version : 1.0.2
• Maven version (mvn -v) :

Apache Maven 3.6.3 (cecedd343002696d0abb50b32b541b8a6ba2883f)
Maven home: /opt/apache-maven-3.6.3
Java version: 1.8.0_271, vendor: Oracle Corporation, runtime: /usr/lib/java/jdk1.8.0_271/jre
Default locale: en_US, platform encoding: UTF-8
OS name: "linux", version: "5.9.10-200.fc33.x86_64", arch: "amd64", family: "unix"

• Kubernetes / Red Hat OpenShift setup and version : Kubernetes 1.19.4

• If it's a bug, how to reproduce : Just add namespace fragment and issue mvn k8s:resource

• If it's a feature request, what is your use case :

• Sample Reproducer Project : https://github.com/r0haaaan/eclipse-jkube-sample-with-resource-fragments/tree/namespace-fragment

[manusa]

Relates to #146