我正在研究從這里獲取的示例 Hibernate+MySQL 應用程序。當我嘗試運行該程序時，我無法連接到數據庫。這是堆棧跟蹤。hibernate.cfg.xml 的內容如下：<?xml version="1.0" encoding="UTF-8"?><!DOCTYPE hibernate-configuration PUBLIC    "-//Hibernate/Hibernate Configuration DTD 3.0//EN"    "http://www.hibernate.org/dtd/hibernate-configuration-3.0.dtd"><hibernate-configuration>         <session-factory>    <!-- Database connection settings -->    <property name="connection.driver_class">com.mysql.jdbc.Driver</property>    <property name="connection.url">jdbc:mysql://localhost:3306/bookstore</property>    <property name="connection.username">root</property>    <property name="connection.password">helloWORLD12</property>    <property name="show_sql">true</property>    <mapping class="net.codejava.hibernate.Book" />  </session-factory></hibernate-configuration>我哪里錯了？我已經檢查過數據庫用戶名和密碼是否正確。