--- old/src/share/classes/javax/swing/UIManager.java	2011-10-20 15:58:33.163157614 +0100
+++ new/src/share/classes/javax/swing/UIManager.java	2011-10-20 15:58:32.819157614 +0100
@@ -608,7 +608,7 @@
                 // May be set on Linux and Solaris boxs.
                 return "com.sun.java.swing.plaf.gtk.GTKLookAndFeel";
             }
-            if (osType == OSInfo.OSType.SOLARIS) {
+            if (osType == OSInfo.OSType.SOLARIS || osType == OSInfo.OSType.AIX) {
                 return "com.sun.java.swing.plaf.motif.MotifLookAndFeel";
             }
         }
--- old/src/share/classes/sun/awt/OSInfo.java	2011-10-20 15:58:34.379157614 +0100
+++ new/src/share/classes/sun/awt/OSInfo.java	2011-10-20 15:58:34.035157614 +0100
@@ -39,6 +39,7 @@
         WINDOWS,
         LINUX,
         SOLARIS,
+        AIX,
         UNKNOWN
     }
 
@@ -101,6 +102,9 @@
             }
 
             // determine another OS here
+            if(osName.contains("AIX")) {
+            	return AIX;
+            }
         }
 
         return UNKNOWN;