[jdk17u] RFR: 4819544: SwingSet2 JTable Demo throws NullPointerException

[Alex Kasko]

On Thu, 7 Oct 2021 11:51:33 GMT, Alex Kasko <akasko at openjdk.org> wrote:

> Clean backport of a SwingSet2 demo fix. Change it to demo code only.
> 
> Additional testing:
> 
>  - [x] checked manually with SwingSet2 that NPE does not happen

Marked the bug for approval.

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PR: https://git.openjdk.java.net/jdk17u/pull/163