SSL validation error while calling a REST API with self signed certificate from spring boot

Question

I created an API in springboot which internally calls a REST API which is self signed

The error i am getting is

pkix-path-building-failed-and-unable-to-find-valid-certification-path-to-requested target

Solution i tried

Since i am using EKS for deploying my application. what i did is

1. Create a config map with the self signed certificate for the REST API
2. Added The Root CA as a Volume mount in deployment file.
3. Verified whether the CA cert is added to Java trust store i can see the certificate

But when i am still getting the PKIX certification issue.