k8s:debug - kubernetes namespace is ignored

[ZoltanMozes]

Operating System
$ uname -a
Linux zoltan-VirtualBox 5.3.0-46-generic #38~18.04.1-Ubuntu SMP Tue Mar 31 04:17:56 UTC 2020 x86_64 x86_64 x86_64 GNU/Linux

Eclipse JKube version
org.eclipse.jkube
kubernetes-maven-plugin
1.0.0-alpha-1

Java version
$ java -version
java version "13.0.2" 2020-01-14
Java(TM) SE Runtime Environment (build 13.0.2+8)
Java HotSpot(TM) 64-Bit Server VM (build 13.0.2+8, mixed mode, sharing)

Maven version
mvn -version
Apache Maven 3.6.3 (cecedd343002696d0abb50b32b541b8a6ba2883f)
Maven home: /home/zoltan/.sdkman/candidates/maven/current
Java version: 13.0.2, vendor: Oracle Corporation, runtime: /home/zoltan/dev/java/jdk-13.0.2
Default locale: en_US, platform encoding: UTF-8
OS name: "linux", version: "5.3.0-46-generic", arch: "amd64", family: "unix"

Target cluster version (Kubernetes, OpenShift, Minikube, CRC, etc.)
$ minikube version
minikube version: v1.9.1
commit: d8747aec7ebf8332ddae276d5f8fb42d3152b5a1

$ kubectl version
Client Version: version.Info{Major:"1", Minor:"18", GitVersion:"v1.18.0", GitCommit:"9e991415386e4cf155a24b1da15becaa390438d8", GitTreeState:"clean", BuildDate:"2020-03-25T20:08:47Z", GoVersion:"go1.13.9", Compiler:"gc", Platform:"linux/amd64"}
Server Version: version.Info{Major:"1", Minor:"18", GitVersion:"v1.18.0", GitCommit:"9e991415386e4cf155a24b1da15becaa390438d8", GitTreeState:"clean", BuildDate:"2020-03-25T14:50:46Z", GoVersion:"go1.13.8", Compiler:"gc", Platform:"linux/amd64"}

Symptom:

k8s:debug

fails to establish port-forwarding via kubectl, because the namespace (pom.xml) is ignored when calling kubectl.

pom.xml

	<properties>
		...
		<jkube.namespace>customnamespace</jkube.namespace>

[INFO] --- kubernetes-maven-plugin:1.0.0-alpha-1:debug (default-cli) @ shopping-cart ---
[INFO] k8s: Using Kubernetes at https://172.17.0.2:8443/ in namespace customnamespace with manifest /home/zoltan/dev/workspaces/eLearning/services/shopping-cart/target/classes/META-INF/jkube/kubernetes.yml 
[INFO] k8s: Using namespace: customnamespace
[INFO] k8s: Updating a Service from kubernetes.yml
[INFO] k8s: Updated Service: target/jkube/applyJson/customnamespace/service-shopping-cart-9.json
[INFO] k8s: Enabling debug on Deployment shopping-cart
[INFO] k8s: Waiting for debug pod with selector LabelSelector(matchExpressions=[], matchLabels={app=shopping-cart, provider=jkube, group=hu.customnamespace}, additionalProperties={}) and environment variables {JAVA_DEBUG_SUSPEND=false, JAVA_ENABLE_DEBUG=true}
[INFO] k8s: Port forwarding to port 5005 on pod shopping-cart-5cfc69469b-9sl86 using command /snap/bin/kubectl
[WARNING] k8s:port-forward Error from server (NotFound): pods "shopping-cart-5cfc69469b-9sl86" not found
[INFO] k8s: 
[INFO] k8s: Now you can start a Remote debug execution in your IDE by using localhost and the debug port 5005
[INFO] k8s: 

The problem is indicated as a warning (still it should be an ERROR):

[WARNING] k8s:port-forward Error from server (NotFound): pods "shopping-cart-5cfc69469b-9sl86" not found

Root cause:
kubernetes namespace is silently ignored by the

k8s:debug

Maven goal.

Ducktaping workaround: configuring the context (for subsequent kubectl commands) manually solves the problem:
kubectl config set-context --current --namespace=customnamespace

Once the context is explicitely set as per above, port forwarding works well when typing:

k8s:debug

The above command is now able to find the pod (since namespace is explicitly set) and port-forwarding can be established -> remote JVM debugger can now be attached from Spring Tool Suit 4 without issues (breakpoints hit etc)