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how to force a JPanel te resize

 
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Please could anyone consider following situation:
I have an instance (thumbnail)of class Thumbnail (that extends a JPanel.)en
It sits in a box.
When some event occurs, thumbnail must redraw itself AND CHANGE IT SIZE.
Alas, the redrawing takes place, but not the resizing. Even if I can overload setMaximumSize() or setPreferredSize(). I must have missed something?
Here is the code (sorry if it to much)

Thanks for your time.
 
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IntelliJ IDE Spring Java
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Quick suggestion... try to revalidate the component that contains the thumbnail, not the thumbnail itself. I'll look closer at the code later and see if I notice anything else.
 
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