diff --git a/SC-boot/linkage-example/src/main/java/jnpf/controller/ContractController.java b/SC-boot/linkage-example/src/main/java/jnpf/controller/ContractController.java
index 947585ce..271c4517 100644
--- a/SC-boot/linkage-example/src/main/java/jnpf/controller/ContractController.java
+++ b/SC-boot/linkage-example/src/main/java/jnpf/controller/ContractController.java
@@ -13,6 +13,7 @@ import jnpf.util.JsonUtil;
 import org.springframework.beans.factory.annotation.Autowired;
 import org.springframework.web.bind.annotation.*;
 import javax.validation.Valid;
+
 import java.util.List;
 
 /**