jsp 自写义类 - Java / Web 开发

这是错误信息，严重: Servlet.service() for servlet jsp threw exception
org.apache.jasper.JasperException: Unable to compile class for JSP: 

An error occurred at line: 33 in the jsp file: /WebRoot/index.jsp
Detail cannot be resolved to a type
30: <span class="one" >论坛</span><span class="two" >主题</span><span class="three" >最后发表时间</span>
31: </div><!--title end-->
32: <%
33: Detail board = new Detail();
34: board.findIndex();
35: %>
36: <%--


An error occurred at line: 33 in the jsp file: /WebRoot/index.jsp
Detail cannot be resolved to a type
30: <span class="one" >论坛</span><span class="two" >主题</span><span class="three" >最后发表时间</span>
31: </div><!--title end-->
32: <%
33: Detail board = new Detail();
34: board.findIndex();
35: %>
36: <%--


Stacktrace:
at org.apache.jasper.compiler.DefaultErrorHandler.javacError(DefaultErrorHandler.java:92)
at org.apache.jasper.compiler.ErrorDispatcher.javacError(ErrorDispatcher.java:330)
at org.apache.jasper.compiler.JDTCompiler.ge