JNLP Runtime Settings shows the current JRE path as default entry. This cannot be removed.
"Remove" button is disabled. But we remove it from UI by providing an invalid JRE path.
This is misleading for user, as the entry is removed from UI.

Steps:
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1) Open Java Control Panel
2) Goto "Java" tab
3) Click on view for application jre
4) Edit the path for default JRE to an invalid path, it shows red cell border
5) Click "OK" button
6) Click on view for application jre again

There is no entry for default JRE. Its removed from UI.
Instead of removing from UI, it should give error on clicking "OK".
Refer to attached screenshot.