[求助]：JSP登录身份验证异常报告 - J2EE论坛 - JAVA论坛

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[求助]：JSP登录身份验证异常报告

我在用JSP制作登录身份验证时，出现的错误提示为：

type Exception report

message

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

exception

org.apache.jasper.JasperException
	org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:367)
	org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:294)
	org.apache.jasper.servlet.JspServlet.service(JspServlet.java:241)
	javax.servlet.http.HttpServlet.service(HttpServlet.java:856)

root cause

java.lang.NullPointerException
	org.apache.jsp.sysmanager.check_jsp._jspService(check_jsp.java:53)
	org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:136)
	javax.servlet.http.HttpServlet.service(HttpServlet.java:856)
	org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:320)
	org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:294)
	org.apache.jasper.servlet.JspServlet.service(JspServlet.java:241)
	javax.servlet.http.HttpServlet.service(HttpServlet.java:856)

note The full stack trace of the root cause is available in the Tomcat logs.

求高手指教！！！

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