diff --git a/designer-base/src/main/java/com/fr/design/data/datapane/connect/JDBCConnectionDef.java b/designer-base/src/main/java/com/fr/design/data/datapane/connect/JDBCConnectionDef.java
index 1410decee..6d15b23e9 100644
--- a/designer-base/src/main/java/com/fr/design/data/datapane/connect/JDBCConnectionDef.java
+++ b/designer-base/src/main/java/com/fr/design/data/datapane/connect/JDBCConnectionDef.java
@@ -24,6 +24,10 @@ public class JDBCConnectionDef {
         return instance;
     }
 
+    private JDBCConnectionDef() {
+
+    }
+
     public String getDatabaseName() {
         return databaseName;
     }