java.lang.NullPointerException 问题
用myeclipse10.0 刚开始的时候是可以的~ 之后把.metadata文件夹删掉 重新导入项目之后,可以正常编译,但是运行的时候,页面无法显示,会提示java.lang.NullPointerException 这样的错误:
具体错误如下:
HTTP Status 500 -
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:541)
org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:375)
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)
filters.SetCharacterEncodingFilter.doFilter(SetCharacterEncodingFilter.java:55)
root cause
java.lang.NullPointerException
org.apache.jsp.login_jsp._jspInit(login_jsp.java:27)
org.apache.jasper.runtime.HttpJspBase.init(HttpJspBase.java:52)
org.apache.jasper.servlet.JspServletWrapper.getServlet(JspServletWrapper.java:159)
org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:329)
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)
filters.SetCharacterEncodingFilter.doFilter(SetCharacterEncodingFilter.java:55)
note The full stack trace of the root cause is available in the Apache Tomcat/6.0.13 logs.
login.jsp 第27行代码如下:
<form action="main.jsp" target="_top" method="POST" name="loginForm" id="loginForm" type="POST">
请各位大神帮帮忙~ 看看问题可能出现在哪里~ 刚开始做JAVA 菜鸟一枚~~ 希望各位能够说的简单点~
谢谢~~~