Exception is buried which makes usage very hard

[mariusstaicu]

Describe the bug

Whenever using auto configuration with "EC" algo the underlying http client fails with exception:
JcaPEMKeyConverter is provided by BouncyCastle, an optional dependency. To use support for EC Keys you must explicitly add this dependency to classpath.

However, this exception is buried in HttpClientUtils.java:214:

} catch (Exception e) { KubernetesClientException.launderThrowable(e); }
This causes the users of this library to look for the source of the problem in other places.

Fabric8 Kubernetes Client version

other (please specify in additional context)

Steps to reproduce

1. on kubernetes-client version 5.12.1
2. try to configure to a local k3s using auto config - it will be using EC algo
3. the result is that the client is burying the root cause mentioned before and it will issue a confusing exception like this: Caused by: javax.net.ssl.SSLHandshakeException: PKIX path building failed: sun.security.provider.certpath.SunCertPathBuilderException: unable to find valid certification path to requested target which is very confusing, since this is not the cause of the problem

Expected behavior

The main cause of the failure shown in logs should be JcaPEMKeyConverter is provided by BouncyCastle, an optional dependency. To use support for EC Keys you must explicitly add this dependency to classpath. and not Caused by: javax.net.ssl.SSLHandshakeException: PKIX path building failed: sun.security.provider.certpath.SunCertPathBuilderException: unable to find valid certification path to requested target.

This can be done by not burying the initial exception.

Runtime

other (please specify in additional context)

Kubernetes API Server version

1.20.12

Environment

Linux

Fabric8 Kubernetes Client Logs

No response

Additional context

fabric8 kubernetes-client version: 1.15.2
kubernetes cluster: k3s

[shawkins]

This was not an intentional swallowing of that exception, it should be throwing instead. After #3654 we'll add the appropriate throws.