<Swing Dev> RFR: 5015261: JInternalFrame causes NPE

[Sergey Bylokhov]

On Thu, 5 Aug 2021 04:59:18 GMT, Prasanta Sadhukhan <psadhukhan at openjdk.org> wrote:

> Will just stating null icon is unsupported do? I think in that case should we throw IAE?

This icon field is protected so technically it can be changed w/o constructor and set method. So we have a choice:
1. Specify that the null icon is unsupported and may throw NPE any time after
2. Update the set method to throw NPE(since this is an exception already used by various parts) if a null value is passed.

We can do only the first one, or both.

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PR: https://git.openjdk.java.net/jdk/pull/4989