在eclipse连接mysql时出现错误希望大神帮助

package com.utils;

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

public class DBUtil {
static {
try {
Class.forName("com.mysql.jdbc.Driver");
} catch (ClassNotFoundException e) {
e.printStackTrace();
}
}

public static Connection getConn() throws Exception {
Connection conn = DriverManager.getConnection(
"jdbc:mysql://localhost:3306/oa", "root", "1234");
System.out.println(conn);
return conn;
}

public static void closed(ResultSet rs, Statement stmt, Connection conn) {
if (rs != null) {
try {
rs.close();
} catch (SQLException e) {
e.printStackTrace();
} finally {
if (stmt != null) {
try {
stmt.close();
} catch (SQLException e) {
e.printStackTrace();
} finally {
if (conn != null) {
try {
conn.close();
} catch (SQLException e) {
e.printStackTrace();
}
}
}
}
}
}

}

public static void main(String[] args) {
try {
getConn();
} catch (Exception e) {
e.printStackTrace();
}
}

}