Reading Value form ConfigMap that are mounted as file in Kubernetes cluster JAVA

Question

Here is my ConfigMap

---

apiVersion: v1
data:
  application_config.properties: |-
    id= abc
    mode= abc
    username= abc
    endpoint: abc
    url= abc
    id= abc
kind: ConfigMap
metadata:
  name: yml-config

and here is my deployment

   ---
apiVersion: apps/v1
kind: Deployment
metadata:
....
spec:
....
  template:
    metadata:
      labels:
        app: demo
      name: demo
    spec:
      containers:
      - image: abc:1.0
        imagePullPolicy: Always
        name: demo
        resources:
          limits:
            cpu: 500m
            memory: 650Mi
          requests:
            cpu: 500m
            memory: 650Mi
      volumeMounts:
        - mountPath: /opt/config/application_config.properties
          subPath: application_config.properties
          name: application-config-volume           
      ........
      volumes:
      - name: application-config-volume
        configMap:
          name: yml-config

What I need is -> I wish to mount my configmap as a single properties file in the mentioned location and just wish to read the values in core java by doing some I/O usage.

But I tried many ways used subpath, items and keys tag too. But I am only getting File not found exception.

(point to note - I dont have the access to look into the container which is creating some issue ) It would be great if someone could help me along with the java code showing how to fetch the value based on the mount path. Which I may try. Thanks in advance.

Answer 1

You can use any function or command that is used to read file at that location