new startup message

src/db/MySQLConnector.java

@@ -28,7 +28,7 @@ public class MySQLConnector extends Database {
                     password);
 
         } catch (SQLException e) {
-            e.printStackTrace();
+            System.err.println("no connection to database! start database server");
         }
 
         return con;

src/db/jdcb.java

@@ -1,6 +1,5 @@
 package db;
 
-import javax.swing.table.DefaultTableModel;
 import java.sql.Connection;
 import java.sql.PreparedStatement;
 import java.sql.ResultSet;