--- java/org/apache/catalina/core/DefaultInstanceManager.java	(revision 993381)
+++ java/org/apache/catalina/core/DefaultInstanceManager.java	(working copy)
@@ -489,7 +489,7 @@ 
             lookedupResource = context.lookup(name);
         } else {
             lookedupResource = context.lookup(
-                    clazz.getName() + "/" + method.getName().substring(3));
+                    clazz.getName() + "/" + getName(method));
         }
 
         accessibility = method.isAccessible();
@@ -497,4 +497,16 @@ 
         method.invoke(instance, lookedupResource);
         method.setAccessible(accessibility);
     }
+
+        public static String getName(Method setter) {
+            StringBuilder name = new StringBuilder(setter.getName());
+
+            // remove 'set'
+            name.delete(0, 3);
+
+            // lowercase first char
+            name.setCharAt(0, Character.toLowerCase(name.charAt(0)));
+
+            return name.toString();
+        }
 }