diff --git a/src/org/redkale/util/ResourceFactory.java b/src/org/redkale/util/ResourceFactory.java
index 60f4318f9..9a61f4b4d 100644
--- a/src/org/redkale/util/ResourceFactory.java
+++ b/src/org/redkale/util/ResourceFactory.java
@@ -438,6 +438,7 @@ public final class ResourceFactory {
         }
     }
 
+    @FunctionalInterface
     public static interface ResourceLoader {
 
         public void load(ResourceFactory factory, Object src, String resourceName, Field field, Object attachment);