新人求助！！jsp+mysql，错误代码Http Status 500

type Exception report
message
description The server encountered an internal error () that prevented it from fulfilling this request.
exceptionorg.apache.jasper.JasperException: java.lang.NullPointerException
org.apache.jasper.servlet.JspServletWrapper.handleJspException(JspServletWrapper.java:541)
org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:435)
org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:320)
org.apache.jasper.servlet.JspServlet.service(JspServlet.java:266)
javax.servlet.http.HttpServlet.service(HttpServlet.java:803)
root causejava.lang.NullPointerException
org.apache.jsp.register_005fsave_jsp._jspService(register_005fsave_jsp.java:69)
org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:70)
javax.servlet.http.HttpServlet.service(HttpServlet.java:803)
org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:393)
org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:320)
org.apache.jasper.servlet.JspServlet.service(JspServlet.java:266)
javax.servlet.http.HttpServlet.service(HttpServlet.java:803)
note The full stack trace of the root cause is available in the Apache Tomcat/6.0.14 logs.

好像是说空指针异常，我是在登录界面userLogin输入用户名userName,密码userPWD,然后跳转到login_check页面，再通过JavaBean连接数据库(mysql)，之后就跳出这个错误

这是我的错误时的截图和login_check.jsp和res包中的DBCon.java的代码

这是报错中提到的login_005fcheck_jsp.java文件