diff --git a/src/main/java/com/fr/data/ParamTableDataDemo.java b/src/main/java/com/fr/data/ParamTableDataDemo.java
index b5c2cd8..2d7f562 100644
--- a/src/main/java/com/fr/data/ParamTableDataDemo.java
+++ b/src/main/java/com/fr/data/ParamTableDataDemo.java
@@ -2,6 +2,7 @@ package com.fr.data;
 
 import com.fr.base.FRContext;
 import com.fr.file.DatasourceManager;
+import com.fr.log.FineLoggerFactory;
 import com.fr.stable.ParameterProvider;
 import java.sql.Connection;
 import java.sql.DriverManager;
@@ -133,14 +134,13 @@ public class ParamTableDataDemo extends AbstractTableData {
         String url = "jdbc:sqlite:////Applications//FineReport10_325//webapps//webroot//help//FRDemo.db";
         String username = "";
         String password = "";
-        Connection con;
+        Connection con = null;
         try {
             Class.forName(driverName);
             con = DriverManager.getConnection(url, username, password);
 
         } catch (Exception e) {
-            e.printStackTrace();
-            return null;
+            FineLoggerFactory.getLogger().error(e.getMessage(), e);
         }
         return con;
     }
diff --git a/src/main/java/com/fr/data/SimpleParamTableDataDemo.java b/src/main/java/com/fr/data/SimpleParamTableDataDemo.java
index b7ef716..0bb630e 100644
--- a/src/main/java/com/fr/data/SimpleParamTableDataDemo.java
+++ b/src/main/java/com/fr/data/SimpleParamTableDataDemo.java
@@ -83,14 +83,13 @@ public class SimpleParamTableDataDemo extends SimpleTableData {
         String url = "jdbc:sqlite:////Applications//FineReport10_325//webapps//webroot//help//FRDemo.db";
         String username = "";
         String password = "";
-        Connection con;
+        Connection con = null;
         try {
             Class.forName(driverName);
             con = DriverManager.getConnection(url, username, password);
 
         } catch (Exception e) {
-            e.printStackTrace();
-            return null;
+            FineLoggerFactory.getLogger().error(e.getMessage(), e);
         }
         return con;
     }