diff --git a/vnfmarket-be/vnf-sdk-marketplace/src/main/java/org/openo/vnfsdk/marketplace/common/CommonConstant.java b/vnfmarket-be/vnf-sdk-marketplace/src/main/java/org/openo/vnfsdk/marketplace/common/CommonConstant.java
index 7345fac..d61deb9 100644
--- a/vnfmarket-be/vnf-sdk-marketplace/src/main/java/org/openo/vnfsdk/marketplace/common/CommonConstant.java
+++ b/vnfmarket-be/vnf-sdk-marketplace/src/main/java/org/openo/vnfsdk/marketplace/common/CommonConstant.java
@@ -58,6 +58,10 @@
   
   public static final  String CATALOUGE_UPLOAD_URL = "/openoapi/catalog/v1/csars";
   
+  private CommonConstant (){
+	  // Cannot create instance of the class
+  }
+  
   public static class functionTest 
   {    
       public static final String FUNCTEST_URL = "/openoapi/vnfsdk/v1/functest/";