Hi all,
I've got a big problem, whats is happening
my application got an error like above and after that the page become 
inacessible, all access to it throws the same error or errors of kind 'not 
getter method for property abc' even when is all alright, without nullpointers.
the only way i found to fix it is deleting .class of the page of the work 
folder of jboss.
i'm using Jboss 4.0.1 sp1, ejb, struts. 
Why i could fix it?

2006-01-20 11:05:00,098 ERROR [org.jboss.web.localhost.Engine] 
ApplicationDispatcher[/csiworkflow] Servlet.service() for servlet jsp threw 
exception
java.lang.IllegalArgumentException: Null property value for 
'csNgtbManifestacaoManiVo'
        at 
org.apache.struts.util.PropertyUtils.getNestedProperty(PropertyUtils.java:417)
        at 
org.apache.struts.util.PropertyUtils.getProperty(PropertyUtils.java:453)
        at org.apache.struts.util.RequestUtils.lookup(RequestUtils.java:503)
        at 
org.apache.struts.taglib.html.BaseFieldTag.doStartTag(BaseFieldTag.java:186)
        at 
org.apache.jsp.webFiles.workflow.ifrmManifestacao_jsp._jspx_meth_html_hidden_3(ifrmManifestacao_jsp.java:1767)
        at 
org.apache.jsp.webFiles.workflow.ifrmManifestacao_jsp._jspService(ifrmManifestacao_jsp.java:624)
        at org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:94)
        at javax.servlet.http.HttpServlet.service(HttpServlet.java:810)
        at 
org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:324)
        at 
org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:292)
        at org.apache.jasper.servlet.JspServlet.service(JspServlet.java:236)
        at javax.servlet.http.HttpServlet.service(HttpServlet.java:810)
        at 
org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:237)
        at 
org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:157)
        at 
org.apache.catalina.core.ApplicationDispatcher.invoke(ApplicationDispatcher.java:704)
        at 
org.apache.catalina.core.ApplicationDispatcher.processRequest(ApplicationDispatcher.java:474)
        at 
org.apache.catalina.core.ApplicationDispatcher.doForward(ApplicationDispatcher.java:409)
        at 
org.apache.catalina.core.ApplicationDispatcher.forward(ApplicationDispatcher.java:312)
        at 
org.apache.struts.action.ActionServlet.processActionForward(ActionServlet.java:1759)
        at 
org.apache.struts.action.ActionServlet.process(ActionServlet.java:1596)
        at org.apache.struts.action.ActionServlet.doGet(ActionServlet.java:492)
        at javax.servlet.http.HttpServlet.service(HttpServlet.java:697)
        at javax.servlet.http.HttpServlet.service(HttpServlet.java:810)

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