ClassCastException org.apache.jasper.runtime.ELContextImpl cannot be cast to org.apache.jasper.el.ELContextImpl

[Dale Ogilvie]

Hi,

I'm seeing this problem below appearing now with one of our web-apps, google 
has not helped me so far... There have been no changes with the web app in 
question, which was working, so I'm picking something is going on with either 
the tomcat or OS (virtualized) environment, but what? Any tips as to how to 
figure out what is going on?

root cause 

java.lang.ClassCastException: org.apache.jasper.runtime.ELContextImpl cannot be 
cast to org.apache.jasper.el.ELContextImpl
        
org.apache.jasper.runtime.PageContextImpl.proprietaryEvaluate(PageContextImpl.java:982)
        
org.apache.jsp.WEB_002dINF.views.promoCodeWelcome_jsp._jspx_meth_c_005fout_005f0(promoCodeWelcome_jsp.java:301)
        
org.apache.jsp.WEB_002dINF.views.promoCodeWelcome_jsp._jspService(promoCodeWelcome_jsp.java:171)
        org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:70)
        javax.servlet.http.HttpServlet.service(HttpServlet.java:722)
        
org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:432)
        org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:390)
        org.apache.jasper.servlet.JspServlet.service(JspServlet.java:334)
        javax.servlet.http.HttpServlet.service(HttpServlet.java:722)
        
org.springframework.web.servlet.view.InternalResourceView.renderMergedOutputModel(InternalResourceView.java:238)
        
org.springframework.web.servlet.view.AbstractView.render(AbstractView.java:250)
        
org.springframework.web.servlet.DispatcherServlet.render(DispatcherServlet.java:1047)
        
org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:817)
        
org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:719)
        
org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:644)
        
org.springframework.web.servlet.FrameworkServlet.doGet(FrameworkServlet.java:549)
        javax.servlet.http.HttpServlet.service(HttpServlet.java:621)
        javax.servlet.http.HttpServlet.service(HttpServlet.java:722)
        jcifs.http.NtlmHttpFilter.doFilter(NtlmHttpFilter.java:125)

The app is deployed on Tomcat 7.0.27, java 1.6_026, erroring jsp line: 
                
<c:out value="${fn:length(promoCodeSpecCommand.user)}" />

Thanks

Dale