How to add OpenJDK 21 image on the Sample drop-down List in Openshift 4?

Solution Verified - Updated -

Environment

  • Red Hat build of OpenJDK
  • Red hat OpenShift Container Platform (OCP)
    • 4.x

Issue

  • How to add OpenJDK 21 image on the Sample Drop-down List?
  • How to add an image to the Java Sample drop-down list?

Resolution

Follow the procedure below - regardless of the namespace the example is being created the procedure below should be done on the openshift namespace, because the Java imagestream is under that namespace and it is fed directly there.

  1. Import an image and set an ImageStreamTag:

    $ oc project openshift
$ oc import-image ubi8/openjdk-21:1.20-3.1724181172 --from=registry.access.redhat.com/ubi8/openjdk-21:1.20-3.1724181172 --confirm
$ oc tag openjdk-21:1.20-3.1724181172 openjdk-21:latest

  2. Edit the Java ImageStream on the openshift namespace, as below, by adding a new tag with the custom name. Example:

        - name: openjdk-21 <-- Display name
      annotations:
        description: Build and run Java applications using Maven.
        iconClass: icon-rh-openjdk
        openshift.io/display-name: Java (OpenJDK21)
        sampleContextDir: undertow-servlet
        sampleRepo: 'https://github.com/jboss-openshift/openshift-quickstarts' <---- Index Repo
        supports: java
        tags: 'builder,java,openjdk'
        version: latest
      from:
        kind: ImageStreamTag
        name: 'openjdk-21:latest'

There is no need for any reloading whatsoever, the image will load almost automatically on the drop-down menu.
The name user sets above at the tag above, will be the name displayed on the drop-down item menu on the sampleRepo chosen. The example above will result in the following item:

Adding OpenJDK 21 builder image
Adding OpenJDK 21 builder image

Root Cause

The Sample Operator will load the Java ImageStream and verify which ones correspond to each Sample Repository, which is the index of the images.
The Java Sample application uses https://github.com/jboss-openshift/openshift-quickstarts so the tag must have that set as sampleRepo.

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