无法从数据库检索数据，仅打印try and catch块

Question

无法从oracle数据库和eclipse中未显示的部署程序集检索数据，仅尝试捕获块正在打印！

package jdbc;

import java.sql.Connection;

import java.sql.DriverManager;

import java.sql.Statement;

import java.sql.ResultSet;




public class Demo 
{

public static void main(String[] args)
 {

 String url="jdbc:oracle:thin:@//localhost:1521/XE";

 String un="system";

 String pw="system";

 Connection con=null;

 Statement stmt=null;

 ResultSet res=null;

try {

    Class.forName("oracle.jdbc.OracleDriver");

    System.out.println("driver successfully loaded");

    DriverManager.getConnection(url,un,pw);

    System.out.println("connection establshed succesfully");

    String s="SELECT * FROM VTURESULTSJAN ";

    stmt=con.createStatement();

    res=stmt.executeQuery(s);

    while(res.next()==true)

    {

        String a=res.getString(1);

        String b=res.getString(2);

        int c=res.getInt(3);

        int d=res.getInt(4);

        int e=res.getInt(5);

        System.out.println(a+""+b+""+c+""+d+""+e);

    }

}
catch(Exception e)

{

    System.out.println("some problem occured");

}

}

}

//输出；驱动程序已成功加载

连接成功建立

发生了一些问题