<Swing Dev> [10] RFR JDK-7042497: javax.swing.JOptionPane.showInternalConfirmDialog throws RuntimeException

[Prasanta Sadhukhan]

Hi All,

Please review a spec violation issue whereby if in 
JOptionPane.showInternalConfirmDialog(Component parentComponent, Object 
message)
"parentComponent" is null, we are getting RuntimeException 
"parentComponent does not have a valid parent"

but as per spec, 
https://docs.oracle.com/javase/8/docs/api/index.html?javax/swing/JOptionPane.html
it says "|parentComponent| - determines the |Frame| in which the dialog 
is displayed; if |null|, or if the |parentComponent| has no |Frame|, a 
default |Frame| is used"

This violation exists for all overridden showInternalConfirmDialog 
methods and showInternalOptionDialog.

The proposed fix creates a default JFrame and shows the confirm dialog 
in it, as stated in the spec.

Bug: https://bugs.openjdk.java.net/browse/JDK-7042497
webrev: http://cr.openjdk.java.net/~psadhukhan/7042497/webrev.00/

Regards
Prasanta
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