Added an empty implementation of the missing setExclude() method so that the class compiles.

org.springframework.context/src/main/java/org/springframework/mapping/support/Mapping.java

@@ -29,6 +29,7 @@ import org.springframework.mapping.MappingFailure;
 /**
  * An individual mapping definition between two fields.
  * @author Keith Donald
+ * @since 3.0
  */
 class Mapping implements MappingConfiguration {
 
@@ -95,4 +96,9 @@ class Mapping implements MappingConfiguration {
 		return "[Mapping<" + getSourceExpressionString() + " -> " + getTargetExpressionString() + ">]";
 	}
 
+	@Override
+	public void setExclude() {
+		// TODO Auto-generated method stub
+	}
+
 }