The final panel of kernel installer is same as final panel of Java installer. Because of that, users have no indication that they've installed just "kernel" of Java and rest of bundles will be downloaded and installed in the background.
The final panel of kernel installer should contain the following paragraph:
Additional Java components are being downloaded and installed in the background. Java applications may not start running until the installation of components it needs has completed.
In addition, the label of the button should read as "Close" instead of "Finish".
For more information, see the attachments.