https://access.redhat.com/documentation/en-us/openjdk

is (at the time of filing) throwing a 404 error

This URI is reached by clicking "openjdk" in the breadcrumb trail on an openjdk docs page

e.g. breadcrumb 

• Products & Services
• Product Documentation
• OpenJDK ← clicking here throws a 404
• 8      ← also throws a 404
• Using OpenJDK 8 source-to-image for OpenShift

in this working docs page

https://access.redhat.com/documentation/en-us/openjdk/8/html/using_openjdk_8_source-to-image_for_openshift/index