I am getting the following exception while running my application in jboss 4.0.2 however sometime in jboss4.0.1sp1 this exception does not come
ann it works fine could any one tell me why this happens

the exception is as follows

org.apache.jasper.JasperException: Unable to compile class for JSP

org.apache.jasper.JasperException: Unable to compile class for JSP

Generated servlet error:
C:\New Folder\jboss-4.0.1sp1\server\SOFA1\work\jboss.web\localhost\scheduler\org\apache\jsp\jsp\Modify_jsp.java:135: _jspx_meth_html_base_0(javax.servlet.jsp.tagext.JspTag,javax.servlet.jsp.PageContext) in org.apache.jsp.jsp.Modify_jsp cannot be applied to (org.apache.struts.taglib.html.HtmlTag,javax.servlet.jsp.PageContext)
if (_jspx_meth_html_base_0(_jspx_th_html_html_0, _jspx_page_context))
^


Generated servlet error:
C:\New Folder\jboss-4.0.1sp1\server\SOFA1\work\jboss.web\localhost\scheduler\org\apache\jsp\jsp\Modify_jsp.java:150: _jspx_meth_html_errors_0(javax.servlet.jsp.tagext.JspTag,javax.servlet.jsp.PageContext) in org.apache.jsp.jsp.Modify_jsp cannot be applied to (org.apache.struts.taglib.html.HtmlTag,javax.servlet.jsp.PageContext)
if (_jspx_meth_html_errors_0(_jspx_th_html_html_0, _jspx_page_context))
^


Generated servlet error:
C:\New Folder\jboss-4.0.1sp1\server\SOFA1\work\jboss.web\localhost\scheduler\org\apache\jsp\jsp\Modify_jsp.java:174: _jspx_meth_bean_write_0(javax.servlet.jsp.tagext.JspTag,javax.servlet.jsp.PageContext) in org.apache.jsp.jsp.Modify_jsp cannot be applied to (org.apache.struts.taglib.html.MessagesTag,javax.servlet.jsp.PageContext)
if (_jspx_meth_bean_write_0(_jspx_th_html_messages_0, _jspx_page_context))
^


Generated servlet error:
C:\New Folder\jboss-4.0.1sp1\server\SOFA1\work\jboss.web\localhost\scheduler\org\apache\jsp\jsp\Modify_jsp.java:449: _jspx_meth_html_submit_0(javax.servlet.jsp.tagext.JspTag,javax.servlet.jsp.PageContext) in org.apache.jsp.jsp.Modify_jsp cannot be applied to (org.apache.struts.taglib.html.FormTag,javax.servlet.jsp.PageContext)
if (_jspx_meth_html_submit_0(_jspx_th_html_form_0, _jspx_page_context))
^
4 errors



org.apache.jasper.compiler.DefaultErrorHandler.javacError(DefaultErrorHandler.java:84)
org.apache.jasper.compiler.ErrorDispatcher.javacError(ErrorDispatcher.java:332)
org.apache.jasper.compiler.Compiler.generateClass(Compiler.java:412)
org.apache.jasper.compiler.Compiler.compile(Compiler.java:472)
org.apache.jasper.compiler.Compiler.compile(Compiler.java:451)
org.apache.jasper.compiler.Compiler.compile(Compiler.java:439)
org.apache.jasper.JspCompilationContext.compile(JspCompilationContext.java:511)
org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:295)
org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:292)
org.apache.jasper.servlet.JspServlet.service(JspServlet.java:236)
javax.servlet.http.HttpServlet.service(HttpServlet.java:810)
org.apache.struts.action.RequestProcessor.doForward(RequestProcessor.java:1069)
org.apache.struts.action.RequestProcessor.processForwardConfig(RequestProcessor.java:455)
org.apache.struts.action.RequestProcessor.process(RequestProcessor.java:279)
org.apache.struts.action.ActionServlet.process(ActionServlet.java:1482)
org.apache.struts.action.ActionServlet.doGet(ActionServlet.java:507)
javax.servlet.http.HttpServlet.service(HttpServlet.java:697)
javax.servlet.http.HttpServlet.service(HttpServlet.java:810)
org.jboss.web.tomcat.filters.ReplyHeaderFilter.doFilter(ReplyHeaderFilter.java:75)


note The full stack trace of the root cause is available in the Apache Tomcat/5.0.28 logs.