Update test to compile with Java release

Author: Charles Greer

appserver/java-spring/src/test/java/com/marklogic/samplestack/mock/MockPojoRepositoryImpl.java

@@ -240,6 +240,11 @@ public Contributor next() {
 			return null;
 		}
 
+		@Override
+		public void close() {
+			//noop
+		}
+
 	}
 
 	@Override