HTTP状态 500 - 内部服务器错误
类型 异常报告
消息 在 [15] 行处理 [/validate.jsp] 时发生异常
描述 服务器遇到一个意外的情况，阻止它完成请求。
例外情况
org.apache.jasper.JasperException: 在 [15] 行处理 [/validate.jsp] 时发生异常
12: //查询user表中的记录
13: String sql="select * from user";
14: MySqlBean.OpenConn();//调用MySqlBean中加载JDBC驱动的方法
15: ResultSet rs=MySqlBean.executeQuery(sql);//取得结果集
16: while(rs.next())
17: {
18: if((rs.getString("username").compareTo(usr)==0)&&(rs.getString
("password").compareTo(pwd)==0))
Stacktrace:
org.apache.jasper.servlet.JspServletWrapper.handleJspException(JspServletWrapper.java:610)
org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:499)
org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:379)
org.apache.jasper.servlet.JspServlet.service(JspServlet.java:327)
javax.servlet.http.HttpServlet.service(HttpServlet.java:764)
org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:53)
根本原因。
java.lang.NullPointerException
org.easybooks.bookstore.jdbc.MySQLConnBean.executeQuery(MySQLConnBean.java:30)
org.apache.jsp.validate_jsp._jspService(validate_jsp.java:140)
org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:70)
javax.servlet.http.HttpServlet.service(HttpServlet.java:764)
org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:466)
org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:379)
org.apache.jasper.servlet.JspServlet.service(JspServlet.java:327)
javax.servlet.http.HttpServlet.service(HttpServlet.java:764)
org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:53)
