<Swing Dev> RFR: 5015261: JInternalFrame causes NPE [v3]

[Prasanta Sadhukhan]

On Sat, 14 Aug 2021 18:50:58 GMT, Phil Race <prr at openjdk.org> wrote:

> We should either prevent null being set or catch all those nulls.

I did that in 1st iteration of this PR..https://github.com/openjdk/jdk/pull/4989/files/2a2ab50ded3305f3a9e0f01e90417b484a0b2db4 

@prrace Should I bring that fix back?

> Just add advisory doc on the protected field too.

> ok, this is part of what this change do, probably the text should be rephrased there?
What should be the advisory phrase? Will the text I have added in the protected field doc not suffice?

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