JSP连接mysql数据库异常！

我在有login.jsp进入主界面是出现了异常；异常代码如下：
type Exception report

message

description The server encountered an internal error () that prevented it from fulfilling this request.

exception

org.apache.jasper.JasperException: java.lang.NullPointerException
org.apache.jasper.servlet.JspServletWrapper.handleJspException(JspServletWrapper.java:522)
org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:416)
org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:337)
org.apache.jasper.servlet.JspServlet.service(JspServlet.java:266)
javax.servlet.http.HttpServlet.service(HttpServlet.java:803)

root cause

java.lang.NullPointerException
org.apache.jsp.gzgl.reg_jsp._jspService(reg_jsp.java:82)
org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:70)
javax.servlet.http.HttpServlet.service(HttpServlet.java:803)
org.apache.jasper.servlet.JspSer

jsp连接mysql数据库 求解决方法：JSP连接MySQL数据库时出现下列异常。 JSP连接数据库出现异常! Jsp连接Mysql数据库出错请教 用JSP 连接MySql时候出以下异常. jsp mysql数据库问题 怎么用JSP连接mysql数据库？？在线等 怎样用jsp连接mysql数据库 代码怎么写啊 JAVA怎么连接MYSQL数据库，注（不是JSP）！！ MYSQL数据库异常！急