8192888: AllSwingComponentsBaselineTest fails with NullPointerException for NimbusLookAndFeel

Reviewed-by: serb

src/java.desktop/share/classes/javax/swing/plaf/synth/SynthButtonUI.java

@@ -25,6 +25,8 @@
 
 package javax.swing.plaf.synth;
 
+import sun.awt.AppContext;
+
 import javax.swing.*;
 import java.awt.*;
 import java.beans.*;
@@ -44,6 +46,8 @@ public class SynthButtonUI extends BasicButtonUI implements
                                  PropertyChangeListener, SynthUI {
     private SynthStyle style;
 
+    private static final Object SYNTH_BUTTON_UI_KEY = new Object();
+
     /**
      * Creates a new UI object for the given component.
      *
@@ -51,7 +55,14 @@ public class SynthButtonUI extends BasicButtonUI implements
      * @return the UI object
      */
     public static ComponentUI createUI(JComponent c) {
-        return new SynthButtonUI();
+        AppContext appContext = AppContext.getAppContext();
+        SynthButtonUI synthButtonUI =
+                (SynthButtonUI) appContext.get(SYNTH_BUTTON_UI_KEY);
+        if (synthButtonUI == null) {
+            synthButtonUI = new SynthButtonUI();
+            appContext.put(SYNTH_BUTTON_UI_KEY, synthButtonUI);
+        }
+        return synthButtonUI;
     }
 
     /**
@@ -206,7 +217,7 @@ public class SynthButtonUI extends BasicButtonUI implements
         // layout the text and icon
         SynthContext context = getContext(b);
         FontMetrics fm = context.getComponent().getFontMetrics(
-            context.getStyle().getFont(context));
+                               context.getStyle().getFont(context));
         context.getStyle().getGraphicsUtils(context).layoutText(
             context, fm, b.getText(), b.getIcon(),
             b.getHorizontalAlignment(), b.getVerticalAlignment(),

test/jdk/javax/swing/plaf/nimbus/AllSwingComponentsBaselineTest.java

@@ -0,0 +1,64 @@
+/*
+ * Copyright (c) 2018, Oracle and/or its affiliates. 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 Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
+ * or visit www.oracle.com if you need additional information or have any
+ * questions.
+ */
+
+/* @test
+   @bug 8192888
+   @summary Verifies getBaseline causes NPE for Nimbus L&F
+   @run main AllSwingComponentsBaselineTest
+ */
+
+import java.awt.FlowLayout;
+import javax.swing.JButton;
+import javax.swing.JFrame;
+import javax.swing.UIManager;
+import javax.swing.SwingUtilities;
+import javax.swing.plaf.basic.BasicButtonUI;
+
+public class AllSwingComponentsBaselineTest {
+    public static void main(String args[]) throws Exception {
+        for (UIManager.LookAndFeelInfo laf : UIManager.getInstalledLookAndFeels()) {
+            System.out.println("Test for LookAndFeel " + laf.getClassName());
+            UIManager.setLookAndFeel(laf.getClassName());
+            SwingUtilities.invokeAndWait(() -> test());
+            System.out.println("Test passed for LookAndFeel " + laf.getClassName());
+        }
+    }
+
+    public static void test() {
+        JFrame frame = null;
+        try {
+            frame = new JFrame();
+            JButton b = new JButton("test");
+            FlowLayout layout = new FlowLayout();
+            layout.setAlignOnBaseline(true);
+
+            frame.getContentPane().setLayout(layout);
+            frame.getContentPane().add(b);
+
+            BasicButtonUI bbUI = (BasicButtonUI) UIManager.getUI(b);
+            bbUI.getBaseline(b, b.getHeight(), b.getWidth());
+        } finally {
+            frame.dispose();
+        }
+    }
+}