<AWT Dev> <Swing Dev> javax.swing.RepaintManager volatileMap

Alexander Scherbatiy alexandr.scherbatiy at oracle.com
Wed Aug 28 05:14:59 PDT 2013

   forwarded the question to awt-dev alias.

On 8/28/2013 3:00 PM, Vladimir Sitnikov wrote:
> Hi,
> In the heapdump of SQL Developer 4.0 I found that RepaintManager holds 
> 23 items of sun.awt.image.BufImgVolatileSurfaceManager 5-10MiB each.
> All the images are contained in "volatileMap" HashMap.
> I identified that the key of the map is sun.awt.Win32GraphicsConfig 
> and that class does not override equals/hashCode.
> Can you please tell me if "using GraphicsConfig as a key knowing the 
> fact this key does not ovveride equals/hashCode" is intentional or not?
> I have checked several keys of the map (Win32GraphicsConfig) and they 
> have identical value (even screen and sTypeOrig references point to 
> the same objects), however as the Win32GraphicsConfig objects itself 
> are different java objects they occupy different entries in valueMap.
> -- 
> Regards,
> Vladimir Sitnikov

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