<AWT Dev> <Swing Dev> Review request #3: 6852592 (revalidate() must be smarter)

Alexander Potochkin Alexander.Potochkin at Sun.COM
Tue Jul 28 11:31:15 PDT 2009

Hello Anthony

> Hi Alex, Artem,
> On 7/28/2009 8:05 PM Alexander Potochkin wrote:
>> As for the second question about making Window/Applet validate roots,
>> I just don't see any practical benefits of this
>> Could you please give more details why it is worth doing?
> As to the Applet class, there's a valid justification: the user does not 
> have a direct access to the underlying embedded frame which therefore 
> might be left invalid forever. Please see [1] for the detailed description.

If you absolutely need at least one validate root in the hierarchy,
and know how to correctly rewrite the messy code in RepaintManager and 
JViewport, I am fine with that


> Regarding the Window: Artem proposed that at [2]. I didn't come up with 
> any failing scenario, so I considered this change harmless and applied 
> it. IMO, it isn't technically needed, but is conceptually correct. 
> Perhaps Artem might comment on that?
> On 7/28/2009 8:29 PM Alexander Potochkin wrote:
>>> 1. What about making the 'c' variable a Container instead of the 
>>> Component at the first loop of the addInvalidComponent() method? 
>>> Would it require promoting isValidateRoot() up to the Component 
>>> afterwards? Obviously, no additional type casting or 
>>> instanceof-checking is required after that change.
>> Hm, getParent() returns Container?!
>> Now I am fine with Container.isValidateRoot()
> Great to hear that! Usually arguing gives birth to the truth. :)

Exactly so!

>>> I would also like to mention that since you claim that 6862117 is not 
>>> a bug, then there's actually no any known issue that would require 
>>> any changes to the addInvalidComponent() right now - generally we 
>>> don't have any "problem" at all.
>> I didn't claim that 6862117 is not a bug
>> I actually said that using Swing components in AWT application is 
>> incorrect
>> Swing components need a top level RootContainer for various needs
>> In the test case for 6862117 I can see that Swing and AWT component
>> are placed inside JFrame, so this is a valid case
> I guess I got the point. Just my example was sort of wrong. Thanks for 
> clarifying that.

You are welcome

It is gonna be a good fix

> [1] http://mail.openjdk.java.net/pipermail/awt-dev/2009-July/000778.html
> [2] http://mail.openjdk.java.net/pipermail/awt-dev/2009-July/000765.html
> -- 
> best regards,
> Anthony

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