CI jenkins io multistage pipeline failing for JDK8 on Jenkins Infrastructure

Hi, I am working on a PR for an existing plugin.
Currently the plugin is using JDK8 and JDK11 multi-stage pipeline in the CI.

My objective is to remove JDK8 stage from the CI pipeline.

When the CI runs the trusted version of Jenkinsfile rather than my proposed version I am seeing this error for a missing pom artifact for JDK8 tools jar.

 **14:41:14** [INFO] --- hpi:3.27:validate-hpi (default-validate-hpi) @ horreum ---

**14:41:15** [WARNING] Error resolving project artifact: The following artifacts could not be resolved: com.sun:tools:pom:1.8.0 (absent): Could not find artifact com.sun:tools:pom:1.8.0 in azure-internal (http://artifact-caching-proxy.privatelink.azurecr.io:8080/) for project com.sun:tools:jar:1.8.0

This is the PR on Github. This is the pipeline #19 on ci.jenkins.io which has details in the Console Log.

Any advice on how to solve the missing artifact in the azure-internal repository ?

Jeremy

All the PR is doing is to remove the build for jdk-8
As the build with jdk-11 succeeds I think it is safe to just merge the PR ignoring the failure.

Thanks for the guidance.

Jeremy