oracle连接成功，但是只有以system用户登录jdbc才能给出正确查询结果，如果新建一个DBA用户，同样的代码连表都查不到，不知为何（附代码）

package com.db;

import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.sql.Statement;

public class DBUitl {
    private static final String URL="jdbc:oracle:thin:@localhost:1521:ORCL";
    private static final String USER="system";//must log on as system, otherwise program can't output correct query result
    private static final String PASSWORD="1234";
    
    public static void main(String[] args) throws ClassNotFoundException, SQLException{
        Class.forName("oracle.jdbc.driver.OracleDriver");
        Connection conn=DriverManager.getConnection(URL, USER, PASSWORD);
        System.out.println(conn);
        Statement st = conn.createStatement();
        String sql="select * from USERTEST";
        ResultSet rs=st.executeQuery(sql);
        while(rs.next()){
            System.out.println(rs.getInt("id")+","+rs.getString("username")+","+rs.getInt("age"));
        }
    }
}