--- old/src/solaris/classes/sun/print/AttributeClass.java	2013-06-20 11:54:57.000000000 -0700
+++ new/src/solaris/classes/sun/print/AttributeClass.java	2013-06-20 11:54:57.000000000 -0700
@@ -25,6 +25,7 @@
 package sun.print;
 
 import java.io.ByteArrayInputStream;
+import java.util.Objects;
 
 public class AttributeClass {
     private String myName;
@@ -250,9 +251,12 @@
 
     public boolean equals(Object obj) {
         return
-            obj != null &&
             obj instanceof AttributeClass &&
-            obj.toString().equals (((AttributeClass) obj).toString());
+            toString().equals(((AttributeClass) obj).toString());
+    }
+ 
+    public int hashCode() {
+        return Objects.hashCode(toString());
     }
 
     public String toString() {