--- a/jdk/src/share/classes/javax/swing/plaf/synth/SynthToolBarUI.java	Tue Jun 15 21:28:22 2010 +0400
+++ b/jdk/src/share/classes/javax/swing/plaf/synth/SynthToolBarUI.java	Tue Jun 15 21:32:59 2010 +0400
@@ -363,18 +363,24 @@
                     SynthIcon.getIconWidth(handleIcon, context) : 0;
                 Dimension compDim;
                 for (int i = 0; i < tb.getComponentCount(); i++) {
-                    compDim = tb.getComponent(i).getMinimumSize();
-                    dim.width += compDim.width;
-                    dim.height = Math.max(dim.height, compDim.height);
+                    Component component = tb.getComponent(i);
+                    if (component.isVisible()) {
+                        compDim = component.getMinimumSize();
+                        dim.width += compDim.width;
+                        dim.height = Math.max(dim.height, compDim.height);
+                    }
                 }
             } else {
                 dim.height = tb.isFloatable() ?
                     SynthIcon.getIconHeight(handleIcon, context) : 0;
                 Dimension compDim;
                 for (int i = 0; i < tb.getComponentCount(); i++) {
-                    compDim = tb.getComponent(i).getMinimumSize();
-                    dim.width = Math.max(dim.width, compDim.width);
-                    dim.height += compDim.height;
+                    Component component = tb.getComponent(i);
+                    if (component.isVisible()) {
+                        compDim = component.getMinimumSize();
+                        dim.width = Math.max(dim.width, compDim.width);
+                        dim.height += compDim.height;
+                    }
                 }
             }
             dim.width += insets.left + insets.right;
@@ -395,18 +401,24 @@
                     SynthIcon.getIconWidth(handleIcon, context) : 0;
                 Dimension compDim;
                 for (int i = 0; i < tb.getComponentCount(); i++) {
-                    compDim = tb.getComponent(i).getPreferredSize();
-                    dim.width += compDim.width;
-                    dim.height = Math.max(dim.height, compDim.height);
+                    Component component = tb.getComponent(i);
+                    if (component.isVisible()) {
+                        compDim = component.getPreferredSize();
+                        dim.width += compDim.width;
+                        dim.height = Math.max(dim.height, compDim.height);
+                    }
                 }
             } else {
                 dim.height = tb.isFloatable() ?
                     SynthIcon.getIconHeight(handleIcon, context) : 0;
                 Dimension compDim;
                 for (int i = 0; i < tb.getComponentCount(); i++) {
-                    compDim = tb.getComponent(i).getPreferredSize();
-                    dim.width = Math.max(dim.width, compDim.width);
-                    dim.height += compDim.height;
+                    Component component = tb.getComponent(i);
+                    if (component.isVisible()) {
+                        compDim = component.getPreferredSize();
+                        dim.width = Math.max(dim.width, compDim.width);
+                        dim.height += compDim.height;
+                    }
                 }
             }
             dim.width += insets.left + insets.right;
@@ -469,22 +481,24 @@
 
                 for (int i = 0; i < tb.getComponentCount(); i++) {
                     c = tb.getComponent(i);
-                    d = c.getPreferredSize();
-                    int y, h;
-                    if (d.height >= baseH || c instanceof JSeparator) {
-                        // Fill available height
-                        y = baseY;
-                        h = baseH;
-                    } else {
-                        // Center component vertically in the available space
-                        y = baseY + (baseH / 2) - (d.height / 2);
-                        h = d.height;
+                    if (c.isVisible()) {
+                        d = c.getPreferredSize();
+                        int y, h;
+                        if (d.height >= baseH || c instanceof JSeparator) {
+                            // Fill available height
+                            y = baseY;
+                            h = baseH;
+                        } else {
+                            // Center component vertically in the available space
+                            y = baseY + (baseH / 2) - (d.height / 2);
+                            h = d.height;
+                        }
+                        //if the component is a "glue" component then add to its
+                        //width the extraSpacePerGlue it is due
+                        if (isGlue(c)) d.width += extraSpacePerGlue;
+                        c.setBounds(ltr ? x : x - d.width, y, d.width, h);
+                        x = ltr ? x + d.width : x - d.width;
                     }
-                    //if the component is a "glue" component then add to its
-                    //width the extraSpacePerGlue it is due
-                    if (isGlue(c)) d.width += extraSpacePerGlue;
-                    c.setBounds(ltr ? x : x - d.width, y, d.width, h);
-                    x = ltr ? x + d.width : x - d.width;
                 }
             } else {
                 int handleHeight = tb.isFloatable() ?
@@ -512,29 +526,31 @@
 
                 for (int i = 0; i < tb.getComponentCount(); i++) {
                     c = tb.getComponent(i);
-                    d = c.getPreferredSize();
-                    int x, w;
-                    if (d.width >= baseW || c instanceof JSeparator) {
-                        // Fill available width
-                        x = baseX;
-                        w = baseW;
-                    } else {
-                        // Center component horizontally in the available space
-                        x = baseX + (baseW / 2) - (d.width / 2);
-                        w = d.width;
+                    if (c.isVisible()) {
+                        d = c.getPreferredSize();
+                        int x, w;
+                        if (d.width >= baseW || c instanceof JSeparator) {
+                            // Fill available width
+                            x = baseX;
+                            w = baseW;
+                        } else {
+                            // Center component horizontally in the available space
+                            x = baseX + (baseW / 2) - (d.width / 2);
+                            w = d.width;
+                        }
+                        //if the component is a "glue" component then add to its
+                        //height the extraSpacePerGlue it is due
+                        if (isGlue(c)) d.height += extraSpacePerGlue;
+                        c.setBounds(x, y, w, d.height);
+                        y += d.height;
                     }
-                    //if the component is a "glue" component then add to its
-                    //height the extraSpacePerGlue it is due
-                    if (isGlue(c)) d.height += extraSpacePerGlue;
-                    c.setBounds(x, y, w, d.height);
-                    y += d.height;
                 }
             }
             context.dispose();
         }
 
         private boolean isGlue(Component c) {
-            if (c instanceof Box.Filler) {
+            if (c.isVisible() && c instanceof Box.Filler) {
                 Box.Filler f = (Box.Filler)c;
                 Dimension min = f.getMinimumSize();
                 Dimension pref = f.getPreferredSize();

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/jdk/test/javax/swing/plaf/synth/SynthToolBarUI/6739756/bug6739756.java	Tue Jun 15 21:32:59 2010 +0400
@@ -0,0 +1,59 @@
+/*
+ * Copyright 2010 Sun Microsystems, Inc.  All Rights Reserved.
+ * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
+ *
+ * This code is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License version 2 only, as
+ * published by the Free Software Foundation.
+ *
+ * This code is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
+ * version 2 for more details (a copy is included in the LICENSE file that
+ * accompanied this code).
+ *
+ * You should have received a copy of the GNU General Public License version
+ * 2 along with this work; if not, write to the Free Software Foundation,
+ * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
+ *
+ * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
+ * CA 95054 USA or visit www.sun.com if you need additional information or
+ * have any questions.
+ */
+
+/**
+ * @test
+ * @bug 6739756
+ * @author Alexander Potochkin
+ * @summary JToolBar leaves space for non-visible items under Nimbus L&F
+ * @run main bug6739756
+ */
+
+import javax.swing.*;
+import java.awt.*;
+
+public class bug6739756 {
+
+    public static void main(String[] args) throws Exception {
+        try {
+           UIManager.setLookAndFeel(
+                   "com.sun.java.swing.plaf.nimbus.NimbusLookAndFeel");
+        }
+        catch (Exception e) {
+            e.printStackTrace();
+            return;
+        }
+        SwingUtilities.invokeAndWait(new Runnable() {
+            public void run() {
+                JToolBar tb = new JToolBar();
+                Dimension preferredSize = tb.getPreferredSize();
+                JButton button = new JButton("Test");
+                button.setVisible(false);
+                tb.add(button);
+                if (!preferredSize.equals(tb.getPreferredSize())) {
+                    throw new RuntimeException("Toolbar's preferredSize is wrong");
+                }
+            }
+        });
+    }
+}