Question

HTTP Status 500 - org.apache.jasper.JasperException: Unable to load class for JSP 这是报的什么错?

请问这是什么错误???
type Exception report

message org.apache.jasper.JasperException: Unable to load class for
JSP

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:340)
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:723)

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:340)
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:723)

root cause
java.lang.ClassNotFoundException: org.apache.jsp.WebRoot.index_jsp
java.net.URLClassLoader$1.run(Unknown Source)
java.net.URLClassLoader$1.run(Unknown Source)
java.security.AccessController.doPrivileged(Native Method)
java.net.URLClassLoader.findClass(Unknown Source)
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:340)
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:723)

note The full stack trace of the root cause is available in the
Apache Tomcat/6.0.37 logs.

Answer 1

root cause
java.lang.ClassNotFoundException: org.apache.jsp.WebRoot.index_jsp

是你的文件不完整吧.?
index.jsp这个文件有吗?

追问

有的,我是这样访问网站的,http://127.0.0.1:8080/WebRoot/index.jsp,这样可以吗

追答

WebRoot下面的东西,如果没有手动配置,那么一般默认的访问地址直接就是
http://127.0.0.1:8080

你试试

追问

这是我指定的虚拟目录,网站则在D:\JSP\online\WebRoot\
127.0.0.1:8080 这样访问会报404 The requested resource is not available.

追答

path一定要指定的.
如果你想通过根目录访问,那么需要paht="/"

如果你想通过WebRoot访问,那么需要path="/WebRoot/".
修改后重启试试

追问

还是不行,报404...
真是麻烦你了,谢谢

Answer 2

首先是你的必要包导入了吗？然后检查页面路径，