8076979: [Regression] Test closed/java/awt/FontClass/DebugFonts.java fails with stackoverflow error

Reviewed-by: serb, jgodinez

src/share/classes/sun/font/FontFamily.java

@@ -223,9 +223,15 @@ public class FontFamily {
     public void setFont(Font2D font, int style) {
 
         if (FontUtilities.isLogging()) {
-            FontUtilities.getLogger().info(
-            "Request to add " + font + " with style " + style +
-            " to family " + this);
+            String msg;
+            if (font instanceof CompositeFont) {
+                msg = "Request to add " + font.getFamilyName(null) +
+                      " with style " + style + " to family " + familyName;
+            } else {
+                msg = "Request to add " + font +
+                      " with style " + style + " to family " + this;
+            }
+            FontUtilities.getLogger().info(msg);
         }
         /* Allow a lower-rank font only if its a file font
          * from the exact same source as any previous font.

test/java/awt/FontClass/DebugFonts.java

+/*
+ * Copyright (c) 2003, 2015, 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 4956241 80769790
+ * @summary NPE debugging fonts
+ * @run main/othervm DebugFonts
+ */
+
+import java.awt.Font;
+
+public class DebugFonts {
+
+   public static void main(String [] args) {
+      System.setProperty("sun.java2d.debugfonts", "true");
+      Font font = new Font("dialog", Font.PLAIN, 14);
+      System.out.println(font);
+      String s1 = font.getFamily();
+      String s2 = font.getFontName();
+   }
+}