问题 具体原因
1.Exception loading sessions from persistent storage 从永久存储加载会话时出现异常
2.com.jbit.entity.book cannot be cast to java.util.ArrayList 用List 不要用ArrayList
3.The method getCharacterEncoding() in the type ServletRequest is not applicable for the arguments (String) 处理乱码的代码 request.setCharacterEncoding("utf-8"); set→写成了get
4.从jsp向数据库中传入一行数据时,结果都为空 用错了参数
5.Unrecognized Windows Sockets error: 无法识别的windows套接字错误:
6.No suitable driver found for jdbc:mysql://localhost:3306/mysql mysql-connector-java-5.1.45-bin.jar忘导了