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FULL PRODUCT VERSION : JDK/JRE 1.6.0_04 ADDITIONAL OS VERSION INFORMATION : Linux Ubuntu 7.10, default theme (Human) EXTRA RELEVANT SYSTEM CONFIGURATION : Gnome 2.20.1 A DESCRIPTION OF THE PROBLEM : I use the GTK theme in Swing applications. The JComboBox in the GTK theme appears malformed when the GUI becomes visible, and the message below is shown in the console: "(<unknown>:32404): Gtk-WARNING **: Attempting to add a widget with type GtkButton to a GtkComboBoxEntry (need an instance of GtkEntry or of a subclass) (<unknown>:32404): Gtk-CRITICAL **: gtk_widget_realize: assertion `GTK_WIDGET_ANCHORED (widget) || GTK_IS_INVISIBLE (widget)' failed (<unknown>:32404): Gtk-CRITICAL **: gtk_paint_box: assertion `style->depth == gdk_drawable_get_depth (window)' failed" STEPS TO FOLLOW TO REPRODUCE THE PROBLEM : 1. I open the NetBeans IDE (version 6.0.1); 2. I create a Desktop application project; 3. I add a javax.swing.JComboBox component in the JFrame; 4. I run the project; 5. When the JFrame becomes visible, the JComboBox added is malformed and the error message appears in the console. EXPECTED VERSUS ACTUAL BEHAVIOR : EXPECTED - 1. I open the NetBeans IDE (version 6.0.1); 2. I create a Desktop application project; 3. I add a javax.swing.JComboBox component in the JFrame; 4. I run the project; 5. no error must appear in the console. ACTUAL - Error shown in the console. ERROR MESSAGES/STACK TRACES THAT OCCUR : "(<unknown>:32404): Gtk-WARNING **: Attempting to add a widget with type GtkButton to a GtkComboBoxEntry (need an instance of GtkEntry or of a subclass) (<unknown>:32404): Gtk-CRITICAL **: gtk_widget_realize: assertion `GTK_WIDGET_ANCHORED (widget) || GTK_IS_INVISIBLE (widget)' failed (<unknown>:32404): Gtk-CRITICAL **: gtk_paint_box: assertion `style->depth == gdk_drawable_get_depth (window)' failed" REPRODUCIBILITY : This bug can be reproduced always. ---------- BEGIN SOURCE ---------- /* * Main.java * */ package javaapplication; import javax.swing.JComboBox; import javax.swing.JFrame; import javax.swing.UIManager; import javax.swing.UnsupportedLookAndFeelException; public class Main { public static void main(String[] args) { try { UIManager.setLookAndFeel("com.sun.java.swing.plaf.gtk.GTKLookAndFeel"); JFrame frame = new JFrame(); JComboBox cb = new JComboBox(); frame.add(cb); frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); frame.setSize(200, 200); frame.setLocation(0, 0); frame.setVisible(true); } catch (ClassNotFoundException ex) { ex.printStackTrace(); } catch (InstantiationException ex) { ex.printStackTrace(); } catch (IllegalAccessException ex) { ex.printStackTrace(); } catch (UnsupportedLookAndFeelException ex) { ex.printStackTrace(); } } } ---------- END SOURCE ----------