myeclipse中出现Unable to compile class for JSP
我用的是myeclipse8.5,最近在学着做一个bbs项目,在JSP文件中调用一个叫Article.java的类,却出现了如下错误:
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: 3 in the jsp file: /test.jsp
Generated servlet error:
Article cannot be resolved to a type
An error occurred at line: 3 in the jsp file: /test.jsp
Generated servlet error:
Article cannot be resolved to a type
org.apache.jasper.compiler.DefaultErrorHandler.javacError(DefaultErrorHandler.java:84)
org.apache.jasper.compiler.ErrorDispatcher.javacError(ErrorDispatcher.java:328)
org.apache.jasper.compiler.JDTCompiler.generateClass(JDTCompiler.java:409)
org.apache.jasper.compiler.Compiler.compile(Compiler.java:288)
org.apache.jasper.compiler.Compiler.compile(Compiler.java:267)
org.apache.jasper.compiler.Compiler.compile(Compiler.java:255)
org.apache.jasper.JspCompilationContext.compile(JspCompilationContext.java:563)
org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:293)
org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:314)
org.apache.jasper.servlet.JspServlet.service(JspServlet.java:264)
javax.servlet.http.HttpServlet.service(HttpServlet.java:802)
note The full stack trace of the root cause is available in the Apache Tomcat/5.5.12 logs.
代码大概意思如下:
<%@ page language="java" pageEncoding="GB18030"%>
<%@ page import="java.util.*,bbs.* " %>
<%
Article a = new Article();
%>
Article位于bbs包中,myeclipse中并没有报错,只是打开网页时出错,WEB-INF\classes目录中也发现Article.class,网上查了很多方法都没解决。
另外,还有一个奇怪的现象,当不断刷新这个页面的时候,错误页面和正常页面总是交替出现,而且还是正常的页面出现的次数多,我以为是ie缓存的问题,但使用了
response.setHeader("Pragma","No-cache");
response.setHeader("Cache-Control","no-cache");
response.setDateHeader("Expires", 0);
和
<meta http-equiv="pragma" content="no-cache">
<meta http-equiv="cache-control" content="no-cache">
<meta http-equiv="expires" content="0">
都没有用,不知什么方法可以解决。
新接触这个感觉学起来很费力,希望大虾们能帮帮我。