莫名奇妙的505错误

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本文详细解析了在使用JSP技术时遇到的505错误问题，包括前台显示的500错误信息和后台的详细堆栈跟踪。通过深入分析错误原因，我们发现是JSP类加载失败导致的问题。文章提供了排查步骤和解决方案，帮助开发者快速定位并解决此类常见错误。

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莫名奇妙的505错误

写了个login.jsp,绝对正确,访问的时候却老是505错误,大概是
The method getJspApplicationContext(ServletContext) is undefined for the type JspFactory

前台抛出的错误如下:

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: org.apache.jasper.JasperException: Unable to load class for JSP
   org.apache.jasper.servlet.JspServletWrapper.getServlet(JspServletWrapper.java:161)
   org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:338)
   org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:313)
   org.apache.jasper.servlet.JspServlet.service(JspServlet.java:260)
   javax.servlet.http.HttpServlet.service(HttpServlet.java:717)
   com.bjpowernode.drp.util.filter.AnthenticationFilter.doFilter(AnthenticationFilter.java:48)
   com.bjpowernode.drp.util.filter.CharsetEncodingFilter.doFilter(CharsetEncodingFilter.java:32)

root cause

org.apache.jasper.JasperException: Unable to load class for JSP
   org.apache.jasper.JspCompilationContext.load(JspCompilationContext.java:630)
   org.apache.jasper.servlet.JspServletWrapper.getServlet(JspServletWrapper.java:149)
   org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:338)
   org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:313)
   org.apache.jasper.servlet.JspServlet.service(JspServlet.java:260)
   javax.servlet.http.HttpServlet.service(HttpServlet.java:717)
   com.bjpowernode.drp.util.filter.AnthenticationFilter.doFilter(AnthenticationFilter.java:48)
   com.bjpowernode.drp.util.filter.CharsetEncodingFilter.doFilter(CharsetEncodingFilter.java:32)

root cause

java.lang.ClassNotFoundException: org.apache.jsp.login_jsp
   java.net.URLClassLoader$1.run(URLClassLoader.java:202)
   java.security.AccessController.doPrivileged(Native Method)
   java.net.URLClassLoader.findClass(URLClassLoader.java:190)
   org.apache.jasper.servlet.JasperLoader.loadClass(JasperLoader.java:134)
   org.apache.jasper.servlet.JasperLoader.loadClass(JasperLoader.java:66)
   org.apache.jasper.JspCompilationContext.load(JspCompilationContext.java:628)
   org.apache.jasper.servlet.JspServletWrapper.getServlet(JspServletWrapper.java:149)
   org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:338)
   org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:313)
   org.apache.jasper.servlet.JspServlet.service(JspServlet.java:260)
   javax.servlet.http.HttpServlet.service(HttpServlet.java:717)
   com.bjpowernode.drp.util.filter.AnthenticationFilter.doFilter(AnthenticationFilter.java:48)
   com.bjpowernode.drp.util.filter.CharsetEncodingFilter.doFilter(CharsetEncodingFilter.java:32)

note The full stack trace of the root cause is available in the Apache Tomcat/6.0.32 logs.

--------------------------------------------------------------------------------

Apache Tomcat/6.0.32
   at org.apache.tomcat.util.IntrospectionUtils.callMethod1(IntrospectionUtils.java:928)




后台抛出的错误:

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: Unable to compile class for JSP:

An error occurred at line: 24 in the generated java file
The method getJspApplicationContext(ServletContext) is undefined for the type JspFactory

Stacktrace:
   org.apache.jasper.compiler.DefaultErrorHandler.javacError(DefaultErrorHandler.java:92)
   org.apache.jasper.compiler.ErrorDispatcher.javacError(ErrorDispatcher.java:330)
   org.apache.jasper.compiler.JDTCompiler.generateClass(JDTCompiler.java:439)
   org.apache.jasper.compiler.Compiler.compile(Compiler.java:349)
   org.apache.jasper.compiler.Compiler.compile(Compiler.java:327)
   org.apache.jasper.compiler.Compiler.compile(Compiler.java:314)
   org.apache.jasper.JspCompilationContext.compile(JspCompilationContext.java:592)
   org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:326)
   org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:313)
   org.apache.jasper.servlet.JspServlet.service(JspServlet.java:260)
   javax.servlet.http.HttpServlet.service(HttpServlet.java:717)
   com.bjpowernode.drp.util.filter.AnthenticationFilter.doFilter(AnthenticationFilter.java:48)
   com.bjpowernode.drp.util.filter.CharsetEncodingFilter.doFilter(CharsetEncodingFilter.java:32)

note The full stack trace of the root cause is available in the Apache Tomcat/6.0.32 logs.

--------------------------------------------------------------------------------

Apache Tomcat/6.0.32
   at org.apache.tomcat.util.digester.SetNextRule.end(SetNextRule.java:193)
   at org.apache.tomcat.util.digester.Rule.end(Rule.java:229)
   at org.apache.tomcat.util.digester.Digester.endElement(Digester.java:1138)
   ... 38 more
2011-11-10 16:21:25 org.apache.catalina.startup.ContextConfig applicationWebConfig
严重: Occurred at line 245 column 20
2011-11-10 16:21:25 org.apache.catalina.startup.ContextConfig start
严重: Marking this application unavailable due to previous error(s)
2011-11-10 16:21:25 org.apache.catalina.core.StandardContext start
严重: Error getConfigured
2011-11-10 16:21:25 org.apache.catalina.core.StandardContext start
严重: Context [/drp4.8] startup failed due to previous errors
2011-11-10 16:21:25 org.apache.coyote.http11.Http11AprProtocol start

换个Tomcat,do it!