RFR: 8068293: [TEST_BUG] Test closed/com/sun/java/swing/plaf/motif/InternalFrame/4150591/bug4150591.java fails with GTKLookAndFeel

[Tejesh R]

On Thu, 16 Oct 2025 09:25:34 GMT, Prasanta Sadhukhan <psadhukhan at openjdk.org> wrote:

> Test fails in GTKLookAndFeel with NPE
> 
> java.lang.NullPointerException
> at javax.swing.border.BevelBorder.<init>(BevelBorder.java:78)
> at javax.swing.BorderFactory.createBevelBorder(BorderFactory.java:155)
> at com.sun.java.swing.plaf.motif.MotifInternalFrameTitlePane$Title.<init>(MotifInternalFrameTitlePane.java:325) 
> 
> because `BorderFactory.createBevelBorder` tries to use brighter shade of highlight and shadow color which it tries to obtain from 
> `UIManager.getColor("activeCaptionBorder")` and `UIManager.getColor("inactiveCaptionBorder")` both of which are not defined in GTK L&F as caption border are not used there
> 
> Fix is made to not use these color to create BevelBorder if these colors are not present..

src/java.desktop/share/classes/javax/swing/BorderFactory.java line 156:

> 154:      */
> 155:     public static Border createBevelBorder(int type, Color highlight, Color shadow) {
> 156:         if (highlight != null && shadow != null) {

Should we update the doc about `null` case too ?

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PR Review Comment: https://git.openjdk.org/jdk/pull/27839#discussion_r2438628809